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 and CPT procedure codes in primary care, family medicine, and general practice settings across the United States.
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.
Telephone and e-visit codes (99441–99443, 99421–99423) can supplement in-person visits; verify payer-specific coverage policies 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.
What is the most commonly billed ICD-10 code in primary care?
I10 (Essential hypertension), Z00.00 (Annual wellness exam), and E11.9 (Type 2 diabetes without complications) are consistently the three most frequently billed diagnosis codes in primary care settings according to CMS claims data.
Can I bill both a preventive visit and a sick visit on the same day?
Yes. Bill the preventive E&M code (99395, 99396, etc.) and the problem-focused E&M code (99213/99214) on the same day with modifier -25 appended to the problem-focused visit. Both must be separately and completely documented in the medical record.
What is the ICD-10 code for hypothyroidism?
E03.9 is Hypothyroidism, unspecified — used when the type of hypothyroidism is not documented. E06.3 is Autoimmune thyroiditis (Hashimoto’s). Code to the specific type when documented, as it affects risk stratification and medication appropriateness review.
How is nicotine dependence coded in primary care?
F17.210 is Nicotine dependence, cigarettes, uncomplicated. Z87.891 is used for personal history of tobacco dependence when the patient is no longer using tobacco. Z72.0 (Tobacco use) is used for current use that doesn’t meet the clinical threshold for dependence.
How does OmniMD support primary care?
OmniMD’s Primary Care EHR includes preventive care checklists aligned with USPSTF and HEDIS measures, chronic disease management dashboards, e-prescribing with PDMP integration, and population health analytics to help identify care gaps.
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