CPT code
Updated September 30, 2026
Definition
A 5-digit code that tells your health plan which medical service or procedure you got. The American Medical Association maintains the codes and updates them every year.
A Current Procedural Terminology (CPT) code is a 5-digit code for a medical service or procedure. The American Medical Association creates the codes and updates them every year. Health plans use them to decide what to pay.
You'll see CPT codes on an itemized bill and sometimes on your explanation of benefits (EOB). Each service usually has its own code, like one for an office visit and another for a blood test. The code should match the care you actually got.
A wrong code can change what you owe. For example, say a short visit gets the code for a longer, more complex one. The allowed amount goes from $130 to $210, so your 20% coinsurance goes from $26 to $42. If a code looks wrong, ask the billing office what it means and why they used it. See common medical billing errors for what to look for.
Related terms
Guides that use this term
- Guide12 common medical billing errors and how to spot themDuplicate charges, wrong codes, missing insurance discounts, and more. Use this checklist of 12 common medical billing errors, then learn how to fix them.
- GuideHow to get an itemized hospital bill (script and letter)Your hospital bill shows only totals? Here's how to get an itemized bill, with a phone script, a short letter, your rights, and what to check first.
Sources
- Healthcare Common Procedure Coding System (HCPCS), Centers for Medicare & Medicaid Services. Accessed September 30, 2026.
This is general information, not legal or medical advice. Rules can depend on your plan and your state. Romi Care isn't an insurer, law firm, collection agency, or government program.