CurrentPremera BluecrossPolicy 7.01.595

Carpal Tunnel Release Surgical Techniques

Defines medical necessity criteria, investigational techniques, documentation and coding for carpal tunnel release (endoscopic or open) and related surgical techniques for treatment of carpal tunnel syndrome for Premera Bluecross members. Includes documentation requirements, CPT coding, investigational procedure list, definitions, evidence and history.

Policy Summary

PayerPremera Bluecross

PolicyCarpal Tunnel Release Surgical Techniques

Policy CodePolicy 7.01.595

Change TypeInterim revisions; coding and administrative updates

Effective DateMar 1, 2026

Next Review Date

Key ActionProvide office visit notes with either electrodiagnostic testing results confirming carpal tunnel syndrome OR a CTS-6 score greater than 12.

SourceLink

POLICY UPDATE CHANGES

03/01/26 interim review simplified medical necessity criteria to state diagnosis supported by either electrodiagnostic testing or CTS-6 > 12; added intracarpal tunnel balloon dilation to investigational list earlier in history.

01/01/26 coding update added CPT code 64728 effective 01/01/26 and adjusted policy wording to 'may be'.

06/01/26 added header that site of service review does not apply to Indian Health Services (IHS) facilities.

02/01/25 new policy approved effective for dates of service on or after 2025-05-06.

2Surgical techniques covered (endoscopic, open)

3Techniques considered investigational

>12CTS-6 threshold for coverage

Coverage Summary

This policy (effective Mar. 1, 2026; last reviewed Jun. 1, 2026) defines medical necessity criteria for carpal tunnel release (open or endoscopic) for Premera members. Coverage stance is mixed: endoscopic and open carpal tunnel release may be considered medically necessary when documentation supports the diagnosis by either electrodiagnostic testing or a CTS-6 score > 12, and when symptoms have not responded to at least >= 6 weeks of conservative treatment (night splinting or corticosteroid injection), with exceptions for severe findings.

Key thresholds & quick facts

CTS-6 threshold> 12

Conservative treatment duration>= 6 weeks (unless thenar wasting, impaired two-point discrimination on thumb/radial side, or other severe symptoms present)

Surgical techniques covered (endoscopic, open)2

Techniques considered investigational3

HighlightsDiagnosis may be supported by electrodiagnostic testing OR CTS-6 > 12; surgery considered after >=6 weeks of conservative care (night splint or corticosteroid injection) unless severe signs present.

Medical Necessity Criteria

Repeat carpal tunnel release surgery

Repeat carpal tunnel release surgery (endoscopic or open) may be considered medically necessary following failure of a previous carpal tunnel release surgery.

Repeat carpal tunnel release surgery (endoscopic or open) may be considered medically necessary following failure of a previous carpal tunnel release surgery

Not Medically Necessary

Carpal tunnel release (endoscopic or open) is considered not medically necessary when:

The above medical necessity criteria have not been met

Coding

Covered CPT / Related codes listedCPTCovered

25999	Unlisted procedure, forearm or wrist
29848	Endoscopy, wrist, surgical, with release of transverse carpal ligament
64721	Neuroplasty and/or transposition; median nerve at carpal tunnel
64999	Unlisted procedure, nervous system
64728	Decompression; median nerve at the carpal tunnel, percutaneous with intracarpal tunnel balloon dilation, including ultrasound guidance (new code effective 01/01/26)

Provider Actions & Billing

Documentation Required

Document clinical diagnosis

Provide office visit notes showing a clinical diagnosis supported by either electrodiagnostic testing results confirming carpal tunnel syndrome or a CTS-6 score greater than 12.

Documentation Required

Document conservative treatment attempt

Document that symptoms have not responded to at least 6 weeks of conservative care, unless severe signs (thenar wasting, impaired two-point discrimination on the thumb/radial side, or other severe carpal tunnel symptoms) are present. Examples of conservative treatments include night hand immobilization and carpal tunnel corticosteroid injection.

Night hand immobilization (splint/brace)
Carpal tunnel corticosteroid injection

Background, Evidence & Definitions

Carpal tunnel syndrome results from compression of the median nerve within the carpal tunnel, producing numbness, tingling, pain and weakness; conservative care includes NSAIDs, corticosteroid injection, and wrist splinting. When conservative measures fail, open or endoscopic carpal tunnel release (cutting the transverse carpal ligament to relieve pressure) may be performed; systematic reviews and randomized trials show open and endoscopic techniques are about equally effective, with endoscopic release possibly offering quicker return to work and fewer minor complications.

Evidence Type	Summary
Systematic reviews / RCTs	Open and endoscopic carpal tunnel release are about as effective; endoscopic may have quicker return to work and fewer minor complications.
Corticosteroid injection	May provide short-term symptom relief and delay surgery but not long-term improvement.

Term	Definition
Phalen's test	Wrist flexion maneuver held 30-60 seconds; positive if numbness/tingling in median nerve distribution.
Thenar wasting	Atrophy of thenar eminence indicating chronic severe median nerve compression.
Tinel's sign	Tapping over median nerve causing tingling in median-innervated digits.
Two point discrimination test	Measures smallest distance at which two points are distinguished; impaired if threshold elevated (>4-10 mm) or inability to distinguish.

Medicare Determinations

Determination Type	Number	Summary
NCD		No national coverage determination

Revision History

03/01/26revisedLatest

01/01/26revised

01/01/26 coding update added CPT code 64728 effective 01/01/26 and adjusted policy wording to 'may be'.

06/01/26added

06/01/26 added header that site of service review does not apply to Indian Health Services (IHS) facilities.