Common Medical Codes

These are among the highest-frequency codes in outpatient billing: a handful of diagnoses and visit types that make up a large share of everyday claims. Search the full interactive set in the code lookup tool, or keep this page open as a static cheat sheet while you work.

Common ICD-10 diagnosis codes

ICD-10 codes answer "what's wrong with the patient." Each one below is paired with the plain-language condition it represents, the same descriptions used throughout this site's tools.

• E11.9 - Type 2 diabetes without complications, one of the single most billed chronic-condition codes in primary care.
• I10 - Essential hypertension, billed at nearly every routine blood-pressure check that confirms an existing diagnosis.
• J06.9 - Acute upper respiratory infection, the generic "cold" code used when a specific virus isn't identified.
• M54.5 - Low back pain, one of the most common reasons for a primary-care or urgent-care visit.
• F41.9 - Anxiety disorder, unspecified, used when a clinician documents anxiety without a more specific subtype.
• Z00.00 - General adult medical exam, the code for a routine physical with no abnormal findings.
• E78.5 - Hyperlipidemia, commonly billed alongside a metabolic panel ordered to check cholesterol.
• N39.0 - Urinary tract infection, a frequent same-day or urgent-care diagnosis.

Common CPT procedure codes

CPT codes answer "what was done." These pair with an ICD-10 code on the same claim to justify the service and set the fee.

• 99213 / 99214 - Established patient office visit, split by how much time and complexity the visit involved.
• 99203 / 99204 - New patient office visit, the equivalent pair for someone the practice hasn't seen before.
• 99395 - Preventive visit for adults age 18-39, billed instead of an office-visit code for an annual physical.
• 36415 - Routine venipuncture, the small fee for drawing blood before it's sent to the lab.
• 85025 - Complete blood count (CBC), one of the most frequently ordered lab panels.
• 80053 - Comprehensive metabolic panel, often ordered alongside a CBC at an annual physical.
• 93000 - Electrocardiogram (ECG), a routine 12-lead heart-rhythm test.

Related Calculators

Turn this static list into a live search, or run the numbers behind a bill and a shift.

• See what a visit might cost after insurance
• Check a unit's nurse-to-patient ratio
• Search these same codes interactively

Things to Know About These Codes

• Frequency is not universality. These codes are common across outpatient primary care broadly; a specialty practice's most-billed list would look different.
• A code being "common" doesn't make it automatically correct for a given visit. The clinician's documentation, not this list, determines which code applies.
• CPT descriptions here are shortened for readability. The official code descriptor is usually longer and includes specific time or complexity criteria.
• This page is a static reference. For the interactive version with search and CPT reference fees side by side, use the code lookup tool instead.