CPT 64721: Carpal tunnel release
What this code means, what it should cost, and how to dispute an overcharge.
Fair Price Reference
What is CPT 64721?
Carpal tunnel release — a surgical procedure that cuts the ligament pressing on the median nerve in the wrist. Relieves numbness, tingling, and weakness in the hand caused by carpal tunnel syndrome.
Typical setting: Ambulatory surgery center or hospital outpatient.
What CPT 64721 should cost
The Centers for Medicare & Medicaid Services (CMS) pays approximately $415 for CPT 64721 under the 2025 Physician Fee Schedule. This is what the federal government has determined is a reasonable payment for this service.
Private insurance typically pays 1.2–1.8x Medicare rates ($498–$747). Hospital chargemaster prices for CPT 64721 often range from $800 to $5000 — a markup of 1.9x to 12x over Medicare.
Common overcharges on CPT 64721
Carpal tunnel release is a quick procedure (often <15 minutes) but facility fees can be $3,000-$5,000 at hospital outpatient departments vs. $500-$1,000 at ambulatory surgery centers. If performed in a hospital setting, compare against ASC rates.
About Orthopedics billing
Orthopedic procedures — joint surgeries, fracture repairs, spine operations, and arthroscopy — are among the highest-billed categories in medicine. Facility fees, implant markups, and bundled post-operative care create frequent billing disputes.
Request the operative report — it documents exactly what was performed. For arthroscopy, verify that diagnostic and therapeutic codes are not both billed. For fracture care, confirm only one treatment method (closed or open) is charged. Check that follow-up visits within the global period are not separately billed.
How to dispute a CPT 64721 overcharge
- Request the itemized bill. You are entitled to a detailed line-by-line bill showing every CPT code billed. Ask in writing.
- Compare to Medicare allowable. If the charge exceeds 150% of Medicare ($623), you have grounds to dispute.
- Request documentation. For E&M codes, ask for the visit note. For procedures, ask for the operative report. The documentation must justify the code billed.
- Send a formal dispute letter. Cite the specific discrepancy between the documentation and the code. Reference Medicare rates and NCCI edits where applicable.
- Follow up in writing. Give the provider 30 days to respond. If they don't, escalate to the state attorney general and insurance commissioner.
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