Primary Care ICD-10 Codes & CPT Codes
Primary care physicians serve as the first point of contact for patients across all age groups and conditions. This page covers the most frequently billed ICD-10-CM diagnosis codes (FY 2027 code set, effective October 1, 2026) and CPT 2026 procedure codes, including the new shorter-duration remote patient monitoring codes, in primary care, family medicine, and general practice settings across the United States.
FY 2027 ICD-10-CM (CMS, eff. 10/1/2026) · CPT 2026 (AMA) · Codes checked against the FY 2027 ICD-10-CM tabular (CMS) · Last verified: October 2026
🔍 Search Codes on This Page
Top ICD-10 Codes for Primary Care
Source: CMS ICD-10-CM Official Code Set FY 2027 (new FY 2027 codes are marked above)
Is Your Primary Care Practice Losing Revenue to Coding Errors?
OmniMD’s Primary Care EHR suggests the right ICD-10 and CPT codes at the point of care, reducing claim denials from day one.
Common CPT Codes for Primary Care Billing
*Approximate 2026 CMS national non-facility rate. Rates vary by geography, setting, and payer contract. Refer to the CMS Physician Fee Schedule for official rates.
Top Denial Reasons for Primary Care Claims
Medical Necessity Not Sufficiently Documented
Payers deny claims when the clinical record lacks documentation supporting why the visit level (e.g., 99214 vs. 99213) was medically necessary. Ensure MDM complexity or total time is fully documented in the note before billing.
Missing or Incorrect Modifier -25
When a preventive visit (99395–99397) is billed on the same day as a problem-oriented E&M (99213–99215), modifier -25 must be appended to the problem E&M to indicate a separate, significant service. Omitting -25 results in automatic bundling denial.
Diagnosis–Procedure Linkage Mismatch
Claims are denied when the ICD-10 diagnosis code does not support the billed procedure (e.g., billing an ECG [93000] without a cardiac or chest-pain diagnosis). Always link each procedure to a diagnosis that clinically justifies it.
Annual Wellness Visit Billed Too Soon
Medicare Annual Wellness Visits (G0438/G0439) are only covered once per 12-month period; submitting before the beneficiary’s eligibility resets results in a frequency denial. Verify the patient’s last AWV date in the payer portal before scheduling.
Primary Care Billing & Coding Tips
- Document and code all chronic conditions at every visit where they are reviewed or managed. This is required by official coding guidelines and affects quality measure performance.
- Use Z00.00 for annual wellness exams without abnormal findings; use Z00.01 when abnormal findings are identified. The distinction affects documentation requirements.
- Online digital E/M (e-visit) codes 99421–99423 and the audio-only telephone codes 98008–98015 (which replaced 99441–99443 in 2025) can supplement in-person visits; Medicare does not pay 98008–98015, so for Medicare report audio-only visits with 99202–99215 plus modifier 93 when eligible. Verify payer-specific coverage before billing.
- Screen for social determinants of health (Z55–Z65) at preventive visits; these codes support population health programs and qualify for some value-based care incentive payments.
Related Resources
Related Specialties
Physicians and coders who visit this page also reference these specialty codes.
Frequently Asked Questions
Streamline Your Primary Care Practice with OmniMD
Purpose-built EHR, billing, and practice management for Primary Care practices.