What Are CPT Codes on Your Medical Bill?

If you've looked at an itemized medical bill, you've probably seen 5-digit numbers next to each charge — something like 99213 or 85025. These are CPT codes (Current Procedural Terminology), and they're the foundation of how medical billing works in the United States.

What CPT Codes Are

Every medical procedure, test, and service has a standardized code. When your doctor sees you for a follow-up visit, that's code 99213. When they order a complete blood count, that's code 85025. When you get a chest X-ray, that's code 71046.

These codes are maintained by the American Medical Association and are used by every hospital, doctor's office, and insurance company in the country. The code determines what the service is worth — Medicare has a specific reimbursement rate for each one.

Why CPT Codes Matter for Your Bill

The CPT code on your bill directly affects how much you're charged. Here are some common billing issues related to codes:

• Upcoding: When a bill uses a higher-level code than what the service may warrant. For example, being billed for a complex visit (99215) when a moderate visit (99213) may have been more appropriate. Note that clinical complexity isn't always visible to patients — your doctor may have clinical reasons for selecting a higher code. If something seems off, it's worth asking the provider to explain the code selection.
• Unbundling: Some procedures should be billed as a single code. If a hospital splits them into two or three separate codes, each with its own charge, that's called unbundling — and it increases your total.
• Wrong codes: Sometimes a code is simply incorrect — a different procedure than what was performed, or a code that doesn't match the diagnosis.

Common CPT Codes You Might See

Here are some of the most common codes and what they mean:

• 99213: Office visit, established patient (low medical decision making) — one of the most common codes on any bill
• 99214: Office visit, established patient (moderate medical decision making) — more expensive than 99213
• 99285: Emergency department visit, high severity
• 85025: Complete Blood Count (CBC) — a standard blood test
• 80053: Comprehensive Metabolic Panel — another common blood test
• 71046: Chest X-Ray, 2 views
• 93010: Electrocardiogram (ECG/EKG)
• 36415: Blood draw (venipuncture)

How to Review Your Codes

You don't need to be a medical billing expert. Here are some things to look for:

1. Compare codes to what happened. If you had a routine check-up but see codes that seem to describe more complex services, ask your provider's billing department to explain the code selections.
2. Look for duplicates. The same code appearing twice at the same price on the same date is worth questioning.
3. Check the prices. Each CPT code has a Medicare reimbursement rate. If your charge is significantly higher than typical market rates, it's worth understanding why.

Upload your bill to FiatVera and we'll compare every CPT code against Medicare rates (as of CY 2026), detect duplicates, and flag potential unbundling issues based on CMS NCCI edits — for free.

This article is for informational purposes only and does not constitute legal, financial, or medical advice. CPT code selection involves clinical judgment — if you have questions about the codes on your bill, ask your provider's billing department for an explanation. Consult a qualified professional for advice specific to your situation.