Endocrinology Billing & Coding Guide
Diabetes management, CGM 95249-95251, thyroid biopsies, HCC capture for E11.x and I10.
Common Endocrinology CPT Codes
Ranked by claim frequency, with current MPFS work RVUs and global periods.
| Code | Description | Work RVU | Total RVU | Global |
|---|---|---|---|---|
| 99213 | Office o/p est low 20 min | 1.30 | 2.85 | XXX |
| 99214 | Office o/p est mod 30 min | 1.92 | 4.06 | XXX |
| 99215 | Office o/p est hi 40 min | 2.80 | 5.76 | XXX |
| 99203 | Office o/p new low 30 min | 1.60 | 3.52 | XXX |
| 99204 | Office o/p new mod 45 min | 2.60 | 5.31 | XXX |
| 99205 | Office o/p new hi 60 min | 3.50 | 7.09 | XXX |
| 95249 | Cont gluc mntr pt prov eqp | 0.00 | 2.09 | XXX |
| 95250 | Cont gluc mntr phys/qhp eqp | 0.00 | 4.57 | XXX |
| 95251 | Cont gluc mntr analysis i&r | 0.68 | 1.05 | XXX |
| 82947 | Assay glucose blood quant | 0.00 | 0.00 | XXX |
| 82948 | Reagent strip/blood glucose | 0.00 | 0.00 | XXX |
| 83036 | Hemoglobin glycosylated a1c | 0.00 | 0.00 | XXX |
| 83037 | Hb glycosylated a1c home dev | 0.00 | 0.00 | XXX |
| 84443 | Assay thyroid stim hormone | 0.00 | 0.00 | XXX |
| 84439 | Assay of free thyroxine | 0.00 | 0.00 | XXX |
| 60100 | Biopsy of thyroid | 1.52 | 3.25 | 000 |
| 76536 | Us exam of head and neck | 0.55 | 3.25 | XXX |
| 60300 | Aspir/inj thyroid cyst | 0.95 | 3.09 | 000 |
| 99490 | Chrnc care mgmt staff 1st 20 | 1.00 | 1.98 | XXX |
| 99497 | Advncd care plan 30 min | 1.50 | 2.60 | XXX |
What Endocrinology 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.
CGM analysis and interpretation (95251, work RVU 0.68) consistently under-billed in Endocrinology practices; many practices provide CGM download/review but forget to code 95251. Industry data shows 40-60% practices underutilize this code. Implementation: Add CGM review checklist to diabetes visit template and train front desk to flag CGM patients for 95251 coding; estimated $12-18K annual revenue per FTE provider.
Modifier 25 on E/M same-day thyroid biopsy (99214-25 + 60100) missed in 25-35% of cases where biopsy was not pre-planned. Train coding staff to flag when E/M note documents unplanned finding (e.g., new nodule discovered on exam) leading to same-day biopsy decision. Modifier 25 adds ~$45-65 per claim; 10-15 cases/month per endocrinologist equals $5.4K-11.7K annually.
Chronic care management (99490, work RVU 1.0) and advanced care planning (99497, work RVU 1.5) poorly captured in Endocrinology for complex diabetic patients on multiple agents or patients with multiple comorbidities. These services bill in addition to office visit and require documentation of non-visit time and care coordination. Workflow: Flag type 1 or type 2 with complications at billing; estimated 8-12 qualifying patients per 100-patient panel, $8-15K annual upside.
Bilateral thyroid procedures (60100 modifier 50 or 60100 + 60100-50) rarely coded correctly; many practices bill single code for bilateral biopsy. Review operative notes for 'bilateral' language and bill modifier 50 appropriately. Also applicable to aspiration/injection (60300). Estimated 3-5 bilateral cases per 100 endocrinology procedures annually, $200-400 per claim, $600-2K revenue capture.
Code pairs that auto-bundle to CO-97
From the National Correct Coding Initiative for Endocrinology. The rationale tells you when a modifier legitimately bypasses the edit and when it cannot.
Thyroid ultrasound (76536) is often pre-procedure imaging for biopsy (60100). Both can be billed separately if ultrasound is diagnostic and biopsy is separate clinical service. Modifier 59 or XS required only if ultrasound performed on different day or different body structure; same-day same-gland requires documentation of distinct clinical purpose.
Free T4 (84439) and TSH (84443) are panel components, not bundled, but payers may deny as 'routine' if ordered together without documented clinical indication for both. Document which test addresses specific clinical question (e.g., TSH for screening vs. Free T4 for hyperthyroid workup).
E/M (99214) and CGM analysis (95251) can be billed same day if CGM review is distinct service requiring separate time/complexity. Modifier 25 required; document that CGM interpretation added substantive medical decision-making beyond routine visit assessment.
Thyroid cyst aspiration/injection (60300) frequently preceded by ultrasound (76536) for guidance. Code 60300 is global; if ultrasound performed same day for procedural planning, append modifier 26 to 76536 (professional only) or use 59 if separate diagnostic study, not procedural guidance.
Modifier Guidance for Endocrinology
When each modifier legitimately applies in this specialty, with denial-pattern context and audit-defense documentation.
Modifier 25 appended to E/M code when significant, separately identifiable evaluation occurs same day as procedure. Example: Patient presents with new thyroid nodule (99203 with 25), then undergoes biopsy (60100). Documentation must show E/M addressed separate problem or added complexity beyond pre-procedure workup.
Modifier 59 used when two normally bundled services are performed as distinct procedures. In Endocrinology context: bilateral thyroid biopsies (60100-59) if each side coded separately, or ultrasound (76536-59) if performed as standalone diagnostic study distinct from procedural ultrasound on same day. Requires clear documentation of separate clinical indication and separate time/resources.
Professional component modifier used when only physician interpretation is provided, not technical/equipment portion. Applied to radiology codes like 76536-26 when Endocrinology practice receives outside ultrasound images for interpretation only. Document receipt of images and date of independent review.
Modifier KX indicates medical policy requirements satisfied (e.g., prior authorization obtained, medical necessity met per payer LCD). Used when payer policy requires modifier before payment. Example: 95250 or 95251 appended with KX when CGM meets frequency/clinical criteria per Medicare LCD.
Decision for surgery modifier applied when E/M service led directly to surgical decision. Example: 99204-57 if office visit led to decision for thyroid biopsy (60100) same day. Documentation must reflect that E/M clinical findings necessitated procedure, not routine pre-op assessment.
Documentation requirements
What needs to live in the encounter note for these codes to survive a payer audit.
- Date and time of service, provider name/ID, and patient ID on every claim line. Auditors match visit notes to billed codes; missing dates create easy denial.
- Specific clinical indication for each lab test ordered (e.g., 'TSH elevated at 8.5, started levothyroxine, needs recheck' vs. generic 'thyroid panel'). Supports medical necessity pushback on routine/non-covered denials.
- For E/M with procedure (99214 + 60100): separate documentation of presenting problem, history/exam for the evaluation, and distinct paragraph describing procedural consent, technique, and findings. Supports modifier 25 defense.
- For thyroid ultrasound (76536): notation of whether study was diagnostic (new nodule workup) vs. procedural guidance (for biopsy). Prevents bundling denials and supports separate billing if clinically distinct.
- For CGM codes (95249, 95250, 95251): patient wear time, number of readings captured, and physician interpretation/management changes made. Justifies per-patient per-month billing and rebuts frequency denials.
- Medication list and dosing changes documented at each visit. Endocrinology audits often target whether dose adjustments were medically necessary, affecting both E/M level justification and thyroid/glucose monitoring code frequency.
OIG and audit triggers in Endocrinology
Patterns that show up in OIG Work Plans, RAC audits, and CERT improper payment reviews. Build internal compliance checks around these.
RAC audits target E/M upcoding in Endocrinology practices, especially 99214-99215 claims; auditors pull charts and verify time/MDM documentation supports billed level. Defense requires detailed note templates with documented exam elements, decision-making details, and time. Practices billing >30% level 4-5 codes trigger automated RAC medical review.
OIG Work Plan historically flags thyroid lab frequency abuse (84439/84443 billed >2 per month per patient without documented clinical reason). Auditors cross-reference billing patterns to clinical notes; document specific clinical changes (TSH drift, medication adjustment, new symptoms) for each lab order to rebut excessive utilization findings.
CGM codes (95249-95251) are new audit focus due to Medicare expansion of coverage. Payers denying claims citing patient equipment not eligible or analysis service billed without corresponding download/review documentation. Require download reports attached to claim or available for review; document in note specific therapy adjustments made based on CGM data.
Thyroid biopsy (60100) bundling denials occur when ultrasound (76536) billed same day without modifier 59 or clear documentation that ultrasound was diagnostic study (not procedural guidance). RAC denies both or forces rebill with 26-TC split. Separate imaging orders from procedure notes in documentation system to defend dual billing.
Payer-specific billing notes
Where the major payers diverge from generic Medicare rules in Endocrinology.
ME Medicare +
LCD L33822 (Thyroid Ultrasound) requires documentation of clinical indication (palpable mass, TSH abnormality, history of thyroid cancer) for coverage; routine screening not covered. NCD 220.1 covers thyroid biopsy only when imaging shows suspicious nodule (BI-RADS 4-5 or equivalent). Prior auth not required nationally but some MACs (Novitas, NGS) require clinical justification upfront. CGM (95251) covered for insulin-dependent diabetics with documented glycemic control problems; frequency capped at 4 per year per Medicare policy effective 2024. 2026 updates expected to expand CGM coverage to non-insulin type 2 diabetics; watch NCCI Edits for new bundling restrictions.
UN UnitedHealthcare +
UHC Optum delegation: Most Endocrinology labs process locally without prior auth, but TSH and Free T4 panels flagged for medical necessity review if billed >2 per patient per quarter without documented thyroid disease diagnosis. Aspiration/injection (60300) requires prior authorization via Optum eviCore portal; biopsy (60100) does not. CGM (95250, 95251) requires prior auth and supporting HbA1c >8.0% at baseline. UHC expects modifier 25 on same-day E/M + procedure; non-compliant claims auto-deny pending appeal with documentation.
AN Anthem +
Anthem ICR (Integrated Care Review) pathway: Most Endocrinology E/M and labs bypass traditional prior auth but are subject to post-payment medical review audits. Anthem triggers audits on 99214-99215 E/M codes billed with >2 thyroid labs same claim; require documentation of distinct clinical questions. Thyroid ultrasound (76536) covered for palpable abnormality, TSH >10 or <0.1 mIU/L, or imaging surveillance per prior cancer history. Biopsy (60100) requires prior Anthem approval in most plans; use eviCore portal. No frequency cap on thyroid labs but medical necessity scrutinized if >3 per 12 months.
CI Cigna +
Cigna eviCore pathway: Radiology (76536) and biopsy (60100) require prior authorization through Cigna's eviCore portal; 2-3 business day turnaround. Cigna has tightened criteria; nodule must be >1 cm and BI-RADS 4+ for biopsy approval. Labs (84439, 84443, 83036) process without pre-auth but Cigna denies as non-covered if diagnosis code doesn't match (e.g., TSH without E04/E05/E89 code). CGM (95249-95251) covered only for insulin-dependent type 1 or type 2; prior auth required. Documentation note: Cigna frequently denies modifier 59 claims without pre-approval; always obtain auth before billing distinct codes same date.
Standard Endocrinology coding workflow
Step 1: Confirm patient status (new vs. established) and visit type (office, telehealth per modifier 95, or consult). Step 2: Document presenting problem, exam elements, and MDM complexity; select E/M code 99203-99205 (new) or 99213-99215 (established) based on time/complexity. Step 3: Identify any procedure or test ordered; check bundling partners list (empty for Endocrinology) and determine if modifier 25 or 59 needed. Step 4: Code all labs (84439, 84443, 83036, 82947) with ICD-10 indication; verify payer frequency limits. Step 5: Append modifiers (25, 26, 57, KX, 95 per visit type); submit with clinical note snippet justifying E/M level and procedure necessity.
Get the full PayerReady toolkit
Credentialing + billing/coding tools built for Endocrinology, 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