Which Insurance Panels Should You Join First? A Data-Driven Prioritization Guide for New Practices

In This Article

• The Four-Factor Framework for Insurance Panel Prioritization
• Start With Medicare — This Is Non-Negotiable
• Medicaid: A Strategic Decision Based on Specialty and Geography
• The Big 5 Commercial Payers: National Market Share Rankings
• How to Research Your Local Payer Market
• Reimbursement Rate Comparison by Specialty
• The "Fast Credentialing" Payers: Prioritize for Quick Revenue
• Regional BCBS Plans: Often More Important Than National Carriers
• Specialty-Specific Credentialing Playbooks
• The Phased Approach: Three Waves for Strategic Enrollment
• Red Flags: Payers to Approach Cautiously or Skip Initially
• Building Your Custom Prioritization Scorecard
• Common Mistakes That Delay Revenue
• Actionable Next Steps

Key Takeaways

• Credential with Medicare first — it is the universal baseline and a gateway requirement for most downstream payers
• Local market share matters more than national payer size; validate your payer mix at the county level
• Start with 3-5 payers in Wave 1, not 10-12 simultaneously — phased enrollment prevents errors and burnout
• Reimbursement rates between payers can vary 40%+ for the same CPT code, making payer selection a six-figure decision
• Complete your CAQH ProView profile before submitting any commercial application to avoid stalling every application at once

Two family medicine practices opened in suburban Dallas within six weeks of each other in 2025. Practice A submitted credentialing applications to 12 insurance panels simultaneously on day one. Practice B picked five payers based on local market data and staggered the rest.

By month four, Practice A was hemorrhaging cash. Half their applications were still pending. Three had stalled due to incomplete paperwork that nobody caught because the office manager was juggling a dozen different payer portals. They had two credentialed payers generating revenue, but neither one represented a significant share of the local insured population. The practice burned through $180,000 in reserves and had to take on an emergency line of credit.

Practice B? Profitable by month three. They credentialed with Medicare first (approved in 65 days), followed by BCBS of Texas (the dominant commercial plan in their ZIP code at 31% market share), and UnitedHealthcare. Those three payers alone covered 58% of the insured patients in their area.

By the time their fourth and fifth applications cleared, the practice was already cash-flow positive and could fund the next wave of enrollments from operating revenue.

The difference was not luck. It was sequencing.

Choosing which insurance companies to credential with — and in what order — is one of the highest-leverage decisions a new practice makes. Get it right, and you build a revenue ramp that funds your growth. Get it wrong, and you spend months credentialed with payers who send you a trickle of patients while the payers your community actually uses sit in a processing queue.

This guide lays out the framework, the data, and the specialty-specific playbooks to help you sequence your payer enrollment for maximum early revenue.

The Four-Factor Framework for Insurance Panel Prioritization

Every payer you consider should be evaluated against four criteria. Weighting these factors against each other — for your specific market and specialty — gives you a rank-ordered enrollment list that maximizes revenue per month of effort.

Factor 1: Patient Volume Potential (Local Market Share)

A payer with 15% national market share might represent 3% or 35% of the insured population in your county. National averages are a starting point, not a strategy. What matters is the payer mix in your specific service area.

UnitedHealthcare dominates employer-sponsored coverage in much of the Midwest and Southeast. BCBS affiliates hold the largest commercial share in states like Texas, Florida, Illinois, and Michigan. Kaiser Permanente is effectively the only game in town for large swaths of Northern California.

If you credential with a payer that covers 4% of your local market before one that covers 28%, you have left months of revenue on the table.

Factor 2: Reimbursement Rates by Specialty

Not all payers pay equally for the same CPT code. The spread between the highest-paying and lowest-paying commercial payer for a standard office visit (99213) can be 40% or more. For procedural specialties, the gap widens further.

A behavioral health practice might find that Aetna reimburses 90837 (60-minute psychotherapy) at $145 while a regional plan pays $98 for the same code. Over 20 sessions per week, that $47 difference is $48,880 per year — from a single clinician.

Reimbursement rates should be the tiebreaker when two payers have similar local market share.

Factor 3: Processing Timeline

Credentialing timelines vary enormously. Medicare enrollment through PECOS averages 60-90 days. Some BCBS affiliates process applications in 30-45 days. Certain Medicaid managed care organizations take 120+ days. A few notoriously slow payers can take six months or longer. For a detailed breakdown of what to expect, see our complete guide to credentialing timelines.

When you are pre-revenue, time is cash. A payer that processes in 45 days and covers 15% of your market will generate revenue months before a payer that takes 150 days and covers 20%. Factor processing speed into your sequencing — especially for your Wave 1 applications.

Factor 4: Administrative Burden

Some payers are operationally clean. Their portals work, their provider relations teams respond within 48 hours, and claims adjudicate predictably. Others are a constant source of prior authorization headaches, claim denials, and credentialing re-verification requests that consume staff hours disproportionate to the revenue they generate.

Ask colleagues in your market. Check online provider forums. A payer with decent reimbursement but a 22% clean claim rate is not worth prioritizing in Wave 1 when your billing operations are still being stood up.

Start With Medicare — This Is Non-Negotiable

Regardless of your specialty, patient demographics, or geography, Medicare should be your first credentialing application. Full stop.

Here is why:

Scale. Medicare covers over 65 million Americans. In most markets, Medicare beneficiaries represent 15-25% of a practice's potential patient base. For specialties that skew older — cardiology, orthopedics, pulmonology, oncology — that number climbs to 40-60%.

Gateway requirement. In the majority of states, an active Medicare enrollment is a prerequisite for Medicaid participation. Many commercial payers also require or strongly prefer that providers hold an active Medicare number before they will process a commercial application. Credentialing with Medicare first removes a blocker from downstream applications.

Rate benchmarking. The Medicare Physician Fee Schedule (MPFS) is the reference point for the entire industry. Most commercial payers set their rates as a percentage of Medicare — typically 110-160% depending on the payer, specialty, and region. Knowing your Medicare rates gives you a baseline to evaluate every commercial contract you receive.

The CMS-855 form as your foundation. The Medicare enrollment application (CMS-855I for individual providers, CMS-855B for groups) forces you to compile every piece of information that downstream payers will also request: NPI, tax ID, malpractice history, board certifications, hospital affiliations, practice locations. Completing the CMS-855 first means you have a master data set ready to repurpose across every subsequent application.

Medicare Enrollment Timeline

Submit your Medicare enrollment application via PECOS before you sign your office lease if possible. The clock starts when CMS receives a complete application, and there is no way to rush it. Every week you delay this submission pushes your first Medicare payment further out.

Medicaid: A Strategic Decision Based on Specialty and Geography

Medicaid is not universally the right second priority. Its value depends heavily on your specialty, your state's Medicaid structure, and your patient population.

When Medicaid Should Be Your Second Priority

• Pediatrics. Over 40% of children in the U.S. are covered by Medicaid or CHIP. A pediatric practice that skips Medicaid is ignoring nearly half its addressable market.
• Behavioral health. Medicaid is the single largest payer for behavioral health services in the United States, funding roughly 25% of all mental health spending nationally.
• OB/GYN. Medicaid covers approximately 42% of all births in the U.S. In states like Louisiana, New Mexico, and Mississippi, that figure exceeds 60%.
• Federally Qualified Health Centers (FQHCs) and practices in underserved areas where Medicaid enrollment density is high.

When Medicaid Can Wait

• Concierge, cash-pay, or elective-focused practices
• Surgical subspecialties with predominantly commercially insured or Medicare populations
• Markets where Medicaid reimbursement is so low that it creates a net loss per visit after overhead

Medicaid Reimbursement Varies Wildly by State

Medicaid is not one program — it is 56 separate programs (50 states, DC, and 5 territories), each setting its own rates. The difference between high-reimbursement and low-reimbursement states is staggering.

Source: Medicaid-to-Medicare Fee Index, Macpac analysis of CMS data, 2024.

In Alaska, Medicaid pays more than Medicare for many services. In New Jersey, Medicaid pays roughly half. This gap should directly influence where Medicaid falls in your payer prioritization sequence.

Managed Care vs. Fee-for-Service Medicaid

Over 70% of Medicaid beneficiaries are enrolled in managed care organizations (MCOs). In states like Florida, Tennessee, and Kansas, virtually all Medicaid is managed care. This means you are not credentialing with "Medicaid" directly — you are credentialing with Molina, Centene (WellCare/Ambetter), UnitedHealthcare Community Plan, Anthem Medicaid, or whichever MCOs hold contracts in your state.

Each MCO is a separate credentialing application. Research which MCOs hold the largest Medicaid enrollment in your county before applying.

The Big 5 Commercial Payers: National Market Share Rankings

After Medicare (and Medicaid, if applicable), your next applications should target the commercial payers with the largest footprint in your area. Nationally, five carriers dominate employer-sponsored and individual market coverage.

Sources: Company 10-K filings, Kaiser Family Foundation, and Mark Farrah Associates enrollment data, 2024-2025.

A Critical Caveat About These Numbers

National market share rankings are misleading for local decision-making. UnitedHealthcare has the largest national footprint, but in metro Atlanta, Anthem BCBS of Georgia dominates. In Minnesota, HealthPartners and Blue Cross Blue Shield of Minnesota together cover more lives than UHC. In Massachusetts, Blue Cross Blue Shield of Massachusetts and Harvard Pilgrim dwarf Cigna and Humana combined.

Use the national rankings as a starting list, then validate against your local market data. The payer mix at the practice three miles down the road is more relevant than a Fortune 500 company's annual report.

How to Research Your Local Payer Market

You cannot prioritize what you cannot measure. Here are four concrete methods to determine which insurance companies to credential with based on your local market reality.

Method 1: State Insurance Department Enrollment Reports

Every state department of insurance publishes annual or quarterly enrollment reports broken down by carrier. These reports show how many covered lives each insurer has in your state, and often break the data down by county or rating area.

Search for: "[Your State] department of insurance health insurance enrollment data" or check the NAIC (National Association of Insurance Commissioners) database.

Method 2: Census and ACS Data for Payer Mix Estimates

The U.S. Census Bureau's American Community Survey publishes insurance coverage data by county. You can see the split between employer-sponsored, individual market, Medicare, Medicaid, military (TRICARE/VA), and uninsured populations. This gives you the macro picture of how your local population is insured.

Method 3: Ask Neighboring Practices

The most accurate local payer data comes from providers already practicing in your area. Ask established practices — especially those in your specialty — what their top five payers are by patient volume. Most providers will share this information freely since you are likely not a direct competitive threat during your startup phase.

If you are joining an existing group or hospital system, your practice manager or billing department will have this data already. Use it.

Method 4: Hospital and Health System Published Data

Nonprofit hospitals publish community health needs assessments every three years (an IRS requirement). These reports include local insurance coverage breakdowns. Large health systems also publish payer mix data in their financial disclosures. Both are publicly available and specific to your geography.

Reimbursement Rate Comparison by Specialty

Reimbursement rates determine your per-visit revenue and directly impact which payers are worth the administrative cost of maintaining a contract. Below is a comparative table using representative rates for common CPT codes across major payers.

Primary Care (Family Medicine / Internal Medicine)

Note: Rates shown are national median estimates. Your contracted rates will vary by region, network tier, and negotiation. Commercial rates typically range from 110% to 160% of Medicare. For current benchmarking data by specialty, see the MGMA DataDive Provider Compensation reports.

Behavioral Health

Behavioral health reimbursement has improved significantly over the past three years as parity enforcement has increased and demand has outstripped supply. Aetna and BCBS affiliates tend to offer the strongest behavioral health rates nationally, though this varies by state.

Cardiology

For procedural cardiology, the reimbursement gap between payers on high-value CPT codes can translate to tens of thousands of dollars annually. A cardiology practice performing 200 echocardiograms per month sees a $26,400 annual difference between BCBS and Cigna at these representative rates.

Orthopedics

Dental

Delta Dental remains the largest standalone dental carrier in the U.S., with over 80 million enrollees. For dental practices, Delta Dental Premier and Delta Dental PPO should be credentialed before any other commercial dental plan in most markets.

The "Fast Credentialing" Payers: Prioritize for Quick Revenue

When you need revenue flowing as soon as possible, processing speed should weight heavily in your first wave. Some payers consistently credential faster than others.

Payers Known for Faster Processing

Payers Known for Slower Processing

If two payers have similar local market share but one credentials in 45 days and the other in 120 days, prioritize the faster one in Wave 1. You can submit the slower application simultaneously, but build your early revenue projections around the payers most likely to be active first.

Retroactive Credentialing: A Cash Flow Lifeline

Some payers offer retroactive credentialing, meaning they will pay claims for services rendered between your application date and your approval date. This is a significant cash flow advantage.

Medicare provides retroactive billing up to 30 days before the effective date in certain circumstances. Several commercial payers allow retroactive claims to the application submission date. Always ask about retroactive credentialing when you submit — and document the date of every submission meticulously. For a deeper look at how retroactive billing works and which payers allow it, read our guide to retroactive billing after credentialing.

Regional BCBS Plans: Often More Important Than National Carriers

Blue Cross Blue Shield is not one company. It is an association of 34 independent, locally operated companies that collectively cover over 115 million Americans — roughly one in three people with health insurance.

In many markets, the local BCBS affiliate is the single largest commercial payer by a wide margin:

In Alabama, BCBS covers roughly three out of four commercially insured residents. A practice that skips BCBS of Alabama is turning away the vast majority of potential patients.

The credentialing process and contract terms differ by BCBS affiliate. Joining the BlueCard network through one affiliate gives you out-of-area coverage for BCBS members from other states, but local contracts with your state's BCBS plan will always yield better reimbursement rates than BlueCard passthrough.

Credential with your local BCBS affiliate directly. Do not assume that a national contract covers you adequately.

Specialty-Specific Credentialing Playbooks

The right credentialing sequence depends on who your patients are. Below are data-backed prioritization lists for common practice types.

Primary Care (Family Medicine, Internal Medicine, General Practice)

Primary care draws from the broadest patient population. Your payer mix will closely mirror the general insured population in your area.

Recommended sequence:

1. Medicare — 15-25% of most primary care panels
2. Local BCBS affiliate — typically the largest commercial payer
3. UnitedHealthcare — largest national commercial carrier
4. Medicaid / Medicaid MCOs — especially if your area has >15% Medicaid enrollment
5. Aetna or Cigna — whichever has larger local presence

Target: 5-6 payers covering 70-80% of your addressable market within the first 6 months.

Behavioral Health (Psychiatry, Psychology, Therapy, Counseling)

Behavioral health faces unique credentialing dynamics. Demand far exceeds supply in most markets, which gives providers leverage — but Medicaid is disproportionately important because of the population served.

Recommended sequence:

1. Medicare — growing behavioral health utilization among seniors
2. Local BCBS affiliate — strong behavioral health reimbursement in most states
3. Aetna — consistently among the highest-paying for therapy codes
4. Medicaid / Medicaid MCOs — largest single payer for behavioral health nationally
5. Cigna or UHC — based on local market share

Note: Many behavioral health providers find that a mix of insurance and private-pay patients optimizes revenue. Credentialing with 4-5 payers while maintaining a portion of private-pay slots is a common and effective strategy.

Pediatrics

Pediatrics has the highest Medicaid dependency of any specialty. Credentialing strategy must reflect this reality.

Recommended sequence:

1. Medicaid and all local Medicaid MCOs — covers 40%+ of children nationally
2. CHIP (Children's Health Insurance Program) — often a separate enrollment from standard Medicaid
3. Local BCBS affiliate — largest commercial pediatric coverage
4. UnitedHealthcare — significant employer-sponsored pediatric coverage
5. Medicare — minimal pediatric volume, but needed for rare cases and administrative requirements

Target: Medicaid MCO coverage should be your top priority. In many pediatric practices, Medicaid represents 50-65% of patient volume.

Dental

Dental insurance operates through a largely separate set of carriers. The major medical payers (UHC, BCBS, Aetna, Cigna) all have dental subsidiaries or affiliates, but Delta Dental dominates standalone dental coverage.

Recommended sequence:

1. Medicaid dental (if your state covers adult dental; all states cover children)
2. Delta Dental Premier — largest dental network, best reimbursement of the Delta networks
3. Delta Dental PPO — separate from Premier; some patients have PPO-only plans
4. BCBS dental plans (local affiliate)
5. Cigna Dental — solid market share, reasonable reimbursement
6. MetLife Dental — common in employer-sponsored plans

Caution: Delta Dental Premier and Delta Dental PPO are separate networks with different fee schedules. Premier pays based on the dentist's submitted fee (up to a maximum), while PPO uses a discounted fee schedule. Understand which you are joining.

OB/GYN

OB/GYN practices must account for both routine gynecological care and obstetric services, which have different payer dynamics.

Recommended sequence:

1. Medicare — routine GYN care for the 65+ population
2. Medicaid / Medicaid MCOs — covers 42% of U.S. births
3. Local BCBS affiliate — typically the largest commercial maternity payer
4. UnitedHealthcare — strong employer-sponsored maternity coverage
5. Aetna or Cigna — based on local market share

Key consideration: Global obstetric fees (the bundled payment for prenatal, delivery, and postpartum care) vary significantly by payer. Verify the global OB rate before finalizing any contract — a $500 difference in the global fee across 100 deliveries per year is $50,000.

Orthopedics and Surgical Subspecialties

Procedural and surgical specialties should weight reimbursement rates more heavily than market share, because the dollar difference per case is substantial.

Recommended sequence:

1. Medicare — high volume of joint replacements, fracture care in 65+ population
2. Local BCBS affiliate — typically highest commercial reimbursement for surgical codes
3. UnitedHealthcare — large volume of employer-sponsored orthopedic referrals
4. Workers' compensation — significant for occupational injury practices (separate credentialing)
5. Aetna or Cigna — based on local rates for your top surgical CPT codes

The Phased Approach: Three Waves for Strategic Enrollment

Trying to credential with every payer at once is a recipe for errors, delays, and staff burnout. A phased approach lets you build momentum, learn from each application cycle, and fund later waves with revenue from earlier ones.

Wave 1: Months 1-2 (Submit Before or At Practice Opening)

Goal: Establish revenue foundation with highest-impact payers.

Wave 1 payers should represent 50-65% of your projected patient volume. If they do not, you have chosen the wrong three payers.

Wave 2: Months 3-4 (Submit Once Wave 1 Is In Process)

Goal: Expand coverage to capture the next tier of patient volume.

By this point, your Wave 1 payers should be approaching approval. You will have a functioning billing operation, which means Wave 2 applications will go smoother — your staff knows the process, your data is compiled, and your CAQH profile is verified.

Wave 3: Months 5-6 (Strategic Expansion)

Goal: Fill remaining gaps and add specialty-specific payers.

Do not skip to Wave 3 payers before Wave 1 is generating revenue. The entire point of phasing is to build cash flow before expanding administrative complexity.

Red Flags: Payers to Approach Cautiously or Skip Initially

Not every payer is worth the credentialing effort, especially during your startup phase. Watch for these warning signs.

Low Reimbursement, High Volume Demand

Some payers offer rates so far below your cost of care that every patient they send you is a net loss. This is particularly common with:

• Medicaid in low-reimbursement states for non-pediatric, non-behavioral health specialties
• Discount networks and secondary PPO rental networks that piggyback on your primary contracts
• Medicare Advantage plans with capitated rates significantly below fee-for-service Medicare

Run the numbers. If a payer's reimbursement for your top 10 CPT codes does not cover your per-visit overhead (staff time, rent, supplies, malpractice allocation), credentialing with that payer costs you money on every visit.

Excessively Slow Processing With No Retroactive Billing

A payer that takes 150 days to credential and does not allow retroactive billing is a payer that generates zero revenue for five months after you apply. Unless that payer represents an outsized share of your local market, push it to Wave 3 or later.

Payers With Notorious Administrative Burdens

Ask five experienced billers in your market which payer they dread the most. You will hear consistent answers. Common complaints include:

• Excessive prior authorization requirements for routine services
• Claim denial rates above 15-20% on first submission
• Credentialing re-verification cycles more frequent than every 36 months
• Non-functional provider portals that require phone calls for basic tasks
• Inconsistent fee schedule transparency (you cannot determine your rates before signing)

These payers may eventually be worth joining — once your practice is established and your billing team is experienced. They are not where you want to focus during your first six months.

Closed Panels

Some payers in certain markets have closed their panels to new providers. This is especially common with high-demand specialties (dermatology, psychiatry, endocrinology) in saturated urban markets. Before investing time in an application, call the payer's provider relations line and confirm the panel is open in your area and specialty. If a panel is closed and you believe it should not be, our guide to credentialing denials and appeals covers your options.

Building Your Custom Prioritization Scorecard

Take the framework above and build a simple scoring matrix for your specific situation. Rate each payer from 1-5 on each factor, then total the scores.

Example scoring for a hypothetical primary care practice. Your numbers will differ.

Medicare gets a fixed place at the top regardless of its score because of the gateway requirements described earlier. After Medicare, sort the remaining payers by total score. Your top 2-3 scorers are your Wave 1 commercial applications. The next 2-3 are Wave 2. Everything else is Wave 3.

This scoring exercise takes 30 minutes and can save you months of misallocated effort.

Common Mistakes That Delay Revenue

After helping hundreds of practices through the credentialing process, these are the errors we see most frequently. Avoiding these pitfalls is critical — for a comprehensive list, see our article on credentialing mistakes that cost your practice money.

Applying to too many payers simultaneously. Each application requires attention, follow-up, and document management. A solo practice trying to manage 10+ simultaneous applications invariably drops balls — missing a follow-up call, letting a document expire, or submitting inconsistent information across applications.

Not completing CAQH ProView first. Over 90% of commercial payers pull credentialing data from CAQH. If your CAQH profile is incomplete, every commercial application stalls. Complete and attest your CAQH profile before submitting any commercial application.

Ignoring re-attestation deadlines. CAQH requires re-attestation every 120 days. If your profile lapses, payers cannot verify your information, and pending applications freeze. Set calendar reminders.

Assuming national contracts cover local needs. A provider who joins a national Aetna network may find that the dominant local Aetna product is a plan that requires a separate regional contract. Verify that the specific plan products popular in your area are covered by the contract you are signing.

Failing to negotiate rates. Many providers accept the first fee schedule a payer offers. Commercial rates are negotiable, especially for specialties in high demand. You will have more leverage once you are established, but even new practices can sometimes negotiate above the standard fee schedule if the payer's network has gaps in your specialty and area.

Actionable Next Steps

If you are opening a new practice or reassessing your current payer strategy, here is your action list for the next 30 days:

1. Pull your local market data. Visit your state insurance department website and download the latest enrollment reports. Identify the top 5 commercial payers by covered lives in your county.

2. Complete your CAQH ProView profile. If you have not already, register at proview.caqh.org and build out your complete provider profile. Attest it immediately upon completion.

3. Submit your Medicare application. File through PECOS. Do this now, even if your practice opening is months away. The processing clock needs to start.

4. Score your payers. Use the four-factor scorecard above to rank your commercial payer options. Identify your Wave 1, Wave 2, and Wave 3 targets.

5. Gather your documents. Assemble your credentialing packet: medical licenses, DEA certificate, board certifications, malpractice insurance face sheet, CV, NPI confirmation, W-9, and practice location details. Having this packet ready before you start applications eliminates the number-one cause of processing delays — incomplete submissions.

6. Set up a tracking system. Every application needs a tracker: date submitted, payer contact, current status, follow-up dates, required documents, and approval date. A spreadsheet works. A credentialing management platform works better.

7. Calendar your follow-ups. Call every payer 14 days after submission to confirm receipt, then every 21 days thereafter until approval. Applications that are not actively monitored take 30-60% longer to process.

The practices that credential efficiently are not the ones that apply everywhere at once. They are the ones that pick the right payers first, submit complete applications, and follow up relentlessly. Strategic sequencing turns credentialing from a six-month cash drain into a three-month revenue ramp.

Your payer enrollment order is a business decision with six-figure consequences. Treat it like one.

PayerReady streamlines payer enrollment and credentialing management for healthcare practices of every size. From automated application tracking to document management and deadline monitoring, we help providers get credentialed faster and start seeing patients sooner. Learn more about our solutions