Hospital Medicine Billing & Coding Guide
Initial hospital 99221-99223, subsequent 99231-99233, admission/discharge same day, transitional care.
Common Hospital Medicine CPT Codes
Ranked by claim frequency, with current MPFS work RVUs and global periods.
| Code | Description | Work RVU | Total RVU | Global |
|---|---|---|---|---|
| 99221 | 1st hosp ip/obs sf/low 40 | 1.63 | 2.23 | XXX |
| 99222 | 1st hosp ip/obs moderate 55 | 2.60 | 3.50 | XXX |
| 99223 | 1st hosp ip/obs high 75 | 3.50 | 4.68 | XXX |
| 99231 | Sbsq hosp ip/obs sf/low 25 | 1.00 | 1.32 | XXX |
| 99232 | Sbsq hosp ip/obs moderate 35 | 1.59 | 2.11 | XXX |
| 99233 | Sbsq hosp ip/obs high 50 | 2.40 | 3.20 | XXX |
| 99238 | Hosp ip/obs dschrg mgmt 30/< | 1.50 | 2.24 | XXX |
| 99239 | Hosp ip/obs dschrg mgmt >30 | 2.15 | 3.19 | XXX |
| 99291 | Critical care first hour | 4.50 | 9.25 | XXX |
| 99292 | Critical care addl 30 min | 2.25 | 4.01 | ZZZ |
| 99477 | Init day hosp neonate care | 7.00 | 8.84 | XXX |
| 99478 | Sbsq ic vlbw inf<1,500 gm | 2.75 | 3.47 | XXX |
| 99479 | Sbsq ic lbw inf 1,500-2,500 | 2.50 | 3.15 | XXX |
| 99480 | Sbsq ic inf pbw 2,501-5,000 | 2.40 | 3.03 | XXX |
| 99497 | Advncd care plan 30 min | 1.50 | 2.60 | XXX |
| 99498 | Advncd care plan addl 30 min | 1.40 | 2.34 | ZZZ |
What Hospital Medicine practices are leaving on the table
High-value services that consistently get under-billed across the specialty. Each one is rooted in current 2026 fee schedule and policy updates.
Modifier 57 underutilization on admissions resulting in surgical decisions. Hospitalists often miss appending -57 to initial E/M codes (99221/99222/99223) when the admission results in a same-day surgical consult or surgical decision. Impact: $150-300 per claim recovered by preventing the E/M from bundling into the surgeon's global package. Workflow change: Train admitting team to flag cases with surgical outcomes and audit charts for missed -57 applications monthly.
Discharge code level selection (99239 vs. 99238) under-utilization. Many practices default to 99238 (lower RVU) even when discharge planning exceeds 30 minutes due to complexity (multiple post-acute placements, complex medication reconciliation). Impact: $80-150 per discharge code per claim by correctly selecting 99239. Solution: Implement discharge time tracking and educate staff on what qualifies as discharge planning time (do not include rounding or routine note-writing).
Critical care add-on code (99292) underuse due to time documentation gaps. Hospitalists often provide critical care beyond one hour but bill only 99291 because they do not formally document the additional 30-minute blocks. Impact: $225 per 99292 unit (2.25 RVU); a 4-hour critical care stay generates 6 units of 99292 revenue if properly documented. Solution: Create critical care time-log template and train ICU staff to record actual minutes spent in critical activities by the physician.
Advanced care planning codes (99497/99498) underutilization in palliative and end-of-life admissions. Many hospitalists do not bill these codes despite spending 30+ minutes discussing goals of care, advance directives, and code status. Impact: $60-90 per code per claim; typically billed once per admission for qualifying patients. Workflow: Flag admissions with palliative diagnoses (stage IV cancer, end-stage organ disease) and remind providers to document advance care planning time; bill 99497 for first 30 min and 99498 for each additional 30-min block.
Code pairs that auto-bundle to CO-97
From the National Correct Coding Initiative for Hospital Medicine. The rationale tells you when a modifier legitimately bypasses the edit and when it cannot.
Initial hospital admission at high complexity (99223) does NOT bundle with critical care (99291) on the same day. These are mutually exclusive based on patient acuity. If patient deteriorates during admission and requires critical care after the initial E/M, document the time point of deterioration and use 99291 for the critical care episode. Modifier 25 is not appropriate here; instead, sequence codes by chronology and ensure medical record clearly shows acuity shift.
Same-day subsequent visits at different complexity levels cannot both be billed. Select the highest level of service performed that day. If billing the lower code, ensure documentation supports that complexity level and rebut any RAC finding by presenting the actual time/complexity metrics from the medical record.
Discharge management codes are time-based (under 30 min vs. over 30 min). Do not bill both on the same discharge date. Chart must document actual time spent on discharge tasks (coordination, communication with post-acute care, prescriptions, review of test results). RACs frequently deny 99239 for insufficient time documentation; attach time-stamped progress notes.
Initial neonatal intensive care (99477) bundles with subsequent visit codes (99478, 99479, 99480) only on the same calendar day per CMS guidelines. Do not bill both 99477 and a subsequent code for the same neonate on day 1. Use 99477 only once per admission; subsequent days use 99478/99479/99480 based on birth weight category.
Modifier Guidance for Hospital Medicine
When each modifier legitimately applies in this specialty, with denial-pattern context and audit-defense documentation.
Modifier 25 in Hospital Medicine applies when a significant, separately identifiable E/M service is provided on the same day as another service. Example: Patient admitted with chest pain (99223), and same day receives diagnostic EKG interpretation by the hospitalist. The 99223 and EKG interpretation are distinct; append -25 to the E/M code. Medicare and most commercial payers accept this. Ensure the medical record separately documents the E/M complexity drivers and the distinct diagnostic service.
Modifier 59 (distinct procedural service) is rarely appropriate in Hospital Medicine because the CPT set contains no procedural codes. If a hospitalist bills a minor procedure code (e.g., venipuncture, which is not in this dataset), -59 would only apply if that procedure is normally bundled into the E/M but was performed as a separately identifiable service. Document the clinical justification for performing it separately; RACs scrutinize -59 heavily.
Modifier 57 (decision for surgery) applies when the hospitalist's E/M service results in the initial decision to perform surgery. Example: Patient admitted with acute abdomen, hospitalist performs 99223, diagnoses acute appendicitis, and makes the decision for emergency appendectomy. Append -57 to 99223. This protects the E/M from bundling into the surgical global package.
Modifier KX (requirements met per medical policy) is required by some payers when billing subsequent hospital visits (99231-99233) beyond a certain number per admission. UnitedHealthcare and Anthem may require KX on visit 8+ to affirm medical necessity. Check your payer's delegation rules and LCD language before appending; do not apply KX automatically.
Modifier 95 (synchronous telemedicine) is increasingly accepted by Medicare and commercial payers for hospital inpatient E/M codes. If a hospitalist provides 99231-99233 via real-time interactive video with the patient in a hospital bed, append -95. Medicare reimbursement parity is in effect for 2024-2025; confirm payer coverage before billing. Documentation must reflect the modality used.
Documentation requirements
What needs to live in the encounter note for these codes to survive a payer audit.
- Time of service and time spent on visit for all E/M codes; RACs use this to validate level selection and to deny codes when time is insufficient relative to complexity claimed.
- Clear problem list or assessment identifying the acute condition(s) prompting hospitalization; supports medical necessity and justifies the E/M level selected on admission and subsequent visits.
- Specific findings from physical examination (vitals, organ system details) and review of systems; required to substantiate moderate or high-complexity E/M codes (99222/99223, 99232/99233).
- Documentation of decision-making and acuity drivers (e.g., new lab result, clinical deterioration, medication adjustment); OIG audits target E/M coding and look for concrete evidence that complexity drivers were present and documented.
- Separate, distinct documentation of any additional service billed with modifier 25 (e.g., EKG interpretation by the same physician); bundling denials occur when auditors see the modifier but no separate service note in the record.
- Discharge summary or discharge note with explicit time spent, transition-of-care communications, and active problem list for discharge codes 99238/99239; RACs frequently deny these due to insufficient documentation of time and complexity.
OIG and audit triggers in Hospital Medicine
Patterns that show up in OIG Work Plans, RAC audits, and CERT improper payment reviews. Build internal compliance checks around these.
RAC Pattern: Unbundling of E/M codes (99231-99233 billed on same day at different complexity levels). RACs identify duplicate visits and request refund. Defense: Chart must show patient encounters at distinct times with separate progress notes justifying the complexity of each; provide timestamps and explain clinical change justifying the higher level visit.
OIG Work Plan Focus: Critical care code stacking (99291 + 99292 billed excessively without documented critical care minutes). OIG audits hospital claims for unbilled critical care time and incorrectly applied critical care codes. Defense: Maintain time logs, critical care flowsheets, and ICU documentation (ventilator settings, vasopressor use, etc.) that prove critical care status for each hour billed.
RAC Pattern: Discharge code denials (99238/99239) due to insufficient time or complexity documentation. RACs deny 99239 claims when discharge notes do not document time spent and do not reflect post-acute coordination. Defense: Write a separate discharge summary with explicit start/stop times, list of items addressed (med reconciliation, durable medical equipment, follow-up scheduling), and communication with receiving facility or patient/family.
OIG Work Plan Focus: Neonatal intensive care code misuse (99477/99478/99479/99480 billed when birth weight criteria are not met or duplicate codes on same day). Neonatal codes are audited heavily in academic medical centers. Defense: Document actual birth weight in grams, admission date, and clinical indicators (respiratory support, nutrition type, etc.) that justify the code level; ensure only one code per calendar day.
Payer-specific billing notes
Where the major payers diverge from generic Medicare rules in Hospital Medicine.
ME Medicare +
CMS LCD (Contractor Local Coverage Determination) varies by MAC region but generally aligns with CPT guidelines. No blanket prior authorization required for inpatient E/M codes, but some MACs require documentation of medical necessity for admissions >7 days (audits target medically unnecessary days). Critical care codes (99291/99292) must meet CMS severity thresholds (ventilator, vasopressor, etc.); do not bill critical care for routine ICU admission. Neonatal codes (99477-99480) are bundled into DRG payment but can be billed separately if documented as distinct services; verify your MAC's bundling rules. CMS 2026 changes: No major coding changes announced, but expect continued RAC audits on E/M level coding and bundling compliance.
UN UnitedHealthcare +
UnitedHealthcare (through Optum) delegates hospital medicine credentialing and often imposes stricter frequency limits on subsequent visit codes. Requires KX modifier on visits beyond a specified daily limit (varies by plan). Prior authorization is NOT required for standard inpatient E/M but may be required for critical care stays exceeding 5 consecutive days in some plans. Optum's medical policy requires clear documentation of acuity drivers for 99232/99233 levels; audits frequently deny these if MDM is not explicitly detailed. Neonatal codes follow standard CMS rules; no additional payer restrictions.
AN Anthem +
Anthem (through Anthem Insurance Companies) has an Integrated Care and Risk Management (ICRM) program that may preauthorize hospital admissions. Once preauthorized, standard inpatient E/M codes do not require additional auth. Anthem medical policy requires time documentation for all E/M codes; audits frequently request copies of progress notes with timestamps. Discharge codes (99238/99239) are subject to medical necessity review; Anthem may deny 99239 if the discharge note does not demonstrate complexity (e.g., multiple comorbidities or post-acute placement barriers). No major policy changes expected for 2026.
CI Cigna +
Cigna does not typically require prior authorization for inpatient hospital medicine E/M codes, but delegates coverage determinations to eviCore for certain high-cost scenarios (prolonged ICU stays, critical care beyond 10 days). Cigna medical policy aligns with CMS on E/M coding; no unique restrictions. Neonatal intensive care codes are covered per birth weight thresholds without prior auth. Cigna audit patterns focus on unbundling and improper modifier use; attach modifier documentation and medical record copies proactively to reduce audit risk. 2026 outlook: Expect continued focus on discharge planning appropriateness and time-based code validation.
Standard Hospital Medicine coding workflow
Step 1: On admission, review chief complaint, acuity drivers (labs, vitals, comorbidities), and complexity of MDM to assign 99221/99222/99223. Document time spent and specific HPI/PE/Assessment elements supporting the level. Step 2: For each subsequent day, compare complexity (straightforward = 99231, moderate = 99232, high = 99233). Do not bill multiple levels in one day; select the highest. Step 3: Before discharge, calculate time spent on discharge tasks (communication with post-acute facility, prescription reconciliation, education) and select 99238 (under 30 min) or 99239 (over 30 min). Time documentation is critical. Step 4: If critical care is needed, stop standard E/M codes and use 99291 for the first hour, then 99292 for each additional 30-minute block. Document critical care time separately from routine visit time. Step 5: Append modifiers (25 for distinct service, 57 for surgical decision, 95 for telemedicine, KX if payer-required) and cross-check against payer LCD before submission.
Get the full PayerReady toolkit
Credentialing + billing/coding tools built for Hospital Medicine, free access with enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Verified against CMS 2026 code set, current NCCI Quarterly Updates, and the X12 Claim Adjustment Reason Code reference. Last updated April 15, 2026. See data sources and methodology.
Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team