Billing & Coding · 2026 CMS PFS

Find every dollar your coding misses.

Every code that drives outpatient internal medicine and medicine subspecialty revenue. When to use it, what to document, what gets denied, and how much it pays at your bonus rate.

2026 Medicare conversion factor: $33.4009 · National GPCI = 1.000 · Non-facility rates · 436 codes · 14 specialties

Codes that move the needle

Six codes worth re-reading if you bill outpatient E/M. Most underbilled in primary care.

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G2211
E/M Est
Complex e/m visit add on
0.33
wRVU
Medicare
17

Consider the ongoing responsibility for the patient's care: either a continuing focal point for needed services or ongoing care of a serious or complex condition. It is not automatic for a diagnosis or specialty.

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99214
E/M Est
Office o/p est mod 30 min
1.92
wRVU
Medicare
136

99214 is the workhorse of primary care and most outpatient subspecialties. Use it when at least one of these is true: two or more chronic problems with progression, treatment changes, or side effects; one undiagnosed new problem with uncertain prognosis; one acute illness with systemic symptoms; or prescription drug management at any complexity. Prescription drug management on its own satisfies the moderate-risk element, which is why straightforward chronic disease follow-ups with a med adjustment routinely clear the 99214 bar. Time-based alternative is 30 to 39 minutes of total time on the date of the encounter. Pick the method that supports the strongest note: encounters with prescription changes are usually cleaner under MDM; encounters with extensive counseling or care coordination are usually cleaner under time.

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G0439
Medicare Wellness
Ppps, subseq visit
1.92
wRVU
Medicare
138

For subsequent AWV eligibility, confirm the payer-reported next eligible date. Medicare uses month-based frequency guidance; do not apply a calendar-year reset or a blanket 365-day calculation. See the G0439 frequency guide and CMS eligibility instructions.

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99483
Neurology
Assmt & care pln pt cog imp
3.84
wRVU
Medicare
293

A detailed assessment and written care plan, not a brief cognitive screen. CMS describes a typical 60-minute visit with an independent historian; confirm the complete current requirements.

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G0537
Screening / Counsel
Risk ascvd tst once pr 12 mo
0.18
wRVU
Medicare
20

G0537 captures an annual ASCVD risk calculation plus counseling for patients without established atherosclerotic cardiovascular disease. Use the ACC/AHA Pooled Cohort Equations (PCE) or an equivalent validated tool to compute the 10-year ASCVD risk percentage. The code is for primary prevention only: patients with known coronary artery disease, prior MI, prior stroke, peripheral artery disease, or any documented ASCVD do not qualify. Most natural pairing is with G0438 or G0439 (AWV), but G0537 can also be billed at a problem-oriented visit. Counseling must address one or more modifiable risk factors: hypertension, dyslipidemia, smoking, diabetes, weight, physical activity, or diet. Once per 12 months. ICD-10: Z13.6 (cardiovascular disorder screening). G0538 is the same-day add-on for additional 15-minute increments of high-intensity behavioral counseling (rarely used in primary care; more relevant in cardiology or weight-management practices).

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99497
Care Mgmt / Counsel
Advncd care plan 30 min
1.50
wRVU
Medicare
87

99497 captures the time spent in a structured conversation about advance directives, healthcare proxy designation, code status, MOLST or POLST forms, hospice eligibility, and goals of care. The patient must be present at the start of the conversation unless the entire visit is with a designated surrogate (which is independently billable but requires explicit documentation). Common scenarios: ACP as a same-day add-on to an AWV (cost-share is waived with modifier 33); ACP at a primary-care continuity visit for a patient with advanced chronic disease; ACP at an oncology visit for a patient at end of treatment options; ACP during a geriatric assessment.

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By specialty

Top codes, common visit patterns, and modifier rules per medicine specialty.

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Outpatient IM
Internal Medicine

The bread and butter: established office visits, new-patient workups, complex chronic disease bundles, and wellness add-ons. The codes that move primary care RVUs are E/M time/MDM, G2211, and the wellness stack.

9921399214992159920499205
Geri / CCM
Geriatrics & Care Management

References for wellness visits, chronic care, transitions of care and cognitive assessment. Each service has its own eligibility, timing and documentation requirements.

G0438G0439994909943999495
Cardiology
Cardiology

Mixed E/M plus high-volume diagnostic procedures: EKGs, echos, stress tests, Holters, device interrogations, vascular ultrasound. Most cardiology procedures split into professional, technical, and global components.

9921499215G22119300093010
Endo
Endocrinology

Cognitive specialty, mostly E/M. Procedural revenue comes from CGM interpretation, thyroid ultrasound and biopsy, and MNT supervision. CGM coding is a regulatory layer cake — get the time, sensor source, and patient setup right or the claim gets denied.

9921499215G22119524995250
GI
Gastroenterology

Procedure-heavy. Most outpatient GI revenue comes from upper and lower endoscopy with modifier-driven add-ons (biopsy, polypectomy, dilation). Screening vs diagnostic coding has different patient cost shares and modifier rules.

9921499215453784538045385
Pulm
Pulmonology

Office spirometry, pulmonary function testing, bronchoprovocation, sleep medicine. Spirometry is one of the most under-coded ancillaries in primary-care-adjacent practices because the bronchodilator add-on gets forgotten.

9921499215940109406094375
Nephro
Nephrology

ESRD monthly capitation drives outpatient nephrology revenue (MCP, 90951-90970), plus CKD E/M, vascular access procedures, and home dialysis training. MCP coding is age-stratified and visit-frequency stratified.

9921499215909519095490957
Rheum
Rheumatology

Cognitive specialty with high-yield joint and soft tissue injections, plus chronic infusion management. Joint injection coding is anatomic-site stratified, and ultrasound guidance is its own bundled code.

9921499215G22112061020611
ID
Infectious Disease

Almost entirely cognitive. Revenue depends on accurate complexity coding (99214/99215 with G2211), outpatient infusion management, and prolonged service coding for long visits. Antimicrobial stewardship rounds are not billable.

99204992059921499215G2211
Heme/Onc
Hematology / Oncology

Infusion-driven revenue dominates: chemotherapy administration codes are time-stratified and drug-type stratified, with strict hierarchy rules. Cognitive E/M with G2211 is critical for survivorship and chronic disease management.

9920599215G22119641396415
Neurology
Neurology

Cognitive specialty with high-RVU diagnostic procedures: EEG, EMG/NCS, evoked potentials, cognitive assessment. Most procedures split into professional and technical components. Cognitive assessment care plan (99483) is one of the highest-RVU outpatient codes in medicine.

99204992059921499215G2211
Allergy
Allergy / Immunology

Three revenue pillars: percutaneous and intradermal allergy testing (per-test billing), immunotherapy preparation and administration (95115-95170), and biologic injection management. Testing codes are billed per-test, so unit counts matter.

9920499214950049502495044
Hospitalist
Hospital Medicine

For Medicare prolonged hospital care, use G0316 with eligible time-selected 99223, 99233, or 99236 and current CMS thresholds. For payers recognizing CPT prolonged hospital services, check 99418. Deleted 99356/99357 codes are not current alternatives.

9922199222992239923199232
Radiology
Radiology

Imaging references organized by modality, anatomy and service components. Select codes from the examination actually performed, then verify coverage and current bundling rules.

7104670450705517125074176

Billing how-to guides

Deep walkthroughs on the codes most likely to deny: modifier conflicts, time-vs-MDM decisions, AWV frequency rules.

All guides →
3 min read
G2211 with Modifier 25: Medicare Exceptions in 2026

Review Medicare's G2211 modifier-25 exceptions for qualifying preventive services, with same-day examples and documentation checks.

G2211
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3 min read
99213 vs 99214: Time and MDM Explained for 2026

Compare 99213 and 99214 using qualifying time or documented MDM. See a worked example and try the free guided E/M tool.

9921399214
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3 min read
G0439 Frequency Limit: Medicare AWV Eligibility Explained

Understand the G0439 frequency limit, Medicare's 11-full-month counting rule, and how to confirm the next eligible Annual Wellness Visit.

G0439G0438
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3 min read
How to Bill Modifier 25 Correctly (and When You Cannot)

Review the separately identifiable E/M requirement, supporting documentation and payer limits for modifier 25.

992139921499215
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3 min read
Telehealth Billing in 2026: POS 02, POS 10, POS 11 and Modifier 95

Check current Medicare telehealth timing, patient-location POS rules and service-specific modifier requirements before coding a visit.

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3 min read
CCM (99490) vs TCM (99495 / 99496) in the Same Month: The 2026 Rules

Review Medicare CCM and TCM concurrent-service requirements, separate time accounting and TCM contact and visit deadlines.

994909949599496
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3 min read
99232 vs 99233: Time vs MDM for Hospitalist Subsequent Visits

Compare subsequent hospital care using documented MDM or qualifying time, with current Medicare prolonged-service distinctions.

9923299233
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3 min read
When to Use G2211: Care Relationships and Eligible Visits

Review G2211 care relationships, eligible settings, team coverage and same-day service limits using current CMS guidance.

G2211
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3 min read
AWV vs IPPE vs Subsequent AWV: G0402, G0438, G0439

Distinguish IPPE, initial AWV and subsequent AWV eligibility, frequency limits and requirements for additional same-day services.

G0402G0438G0439
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3 min read
99495 vs 99496: TCM Timing and Documentation Checklist

Compare 99495 and 99496 discharge contact, face-to-face timing, MDM, and medication reconciliation requirements with a practical checklist.

9949599496
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Educational reference, not billing or legal advice. RVU and CF values reflect the 2026 CMS Physician Fee Schedule (national, non-facility, GPCI = 1). Payer policies vary; verify against your contracts and your compliance team before final coding. Coverage of codes is curated, not exhaustive. New content quarterly.