TL;DR: Aetna, a CVS Health company, modified CPB 0850 covering brachial plexus surgery, effective December 20, 2025. Here's what changes for billing teams.
CPB 0850 Aetna is the clinical policy bulletin governing coverage of brachial plexus surgery across neuroplasty, nerve grafting, nerve transfers, and dorsal root entry zone procedures. This update draws a sharper line between covered reconstructive procedures — CPT codes 64713, 64892, 64893, 64897, 64898, 64901, 64902, 64905, and 64907 — and a growing list of experimental approaches now explicitly excluded, including CPT 64912 and 64913 for nerve allograft repair. If your practice bills for obstetric brachial plexus injuries or traumatic brachial plexus avulsions, this Aetna brachial plexus surgery coverage policy has real claim denial exposure you need to address before December 20, 2025.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Aetna, a CVS Health company |
| Policy | Brachial Plexus Surgery – CPB 0850 |
| Policy Code | CPB 0850 |
| Change Type | Modified |
| Effective Date | December 20, 2025 |
| Impact Level | High |
| Specialties Affected | Neurosurgery, Orthopedic Surgery, Plastic Surgery, Pediatric Surgery |
| Key Action | Audit active authorizations and charge capture for CPT 64912, 64913, and 20985 before December 20, 2025 |
Aetna Brachial Plexus Surgery Coverage Criteria and Medical Necessity Requirements 2025
The coverage policy under CPB 0850 covers three main categories of brachial plexus surgery when specific medical necessity criteria are met. Know the distinctions — they're what separate a paid claim from a denial.
Neuroplasty (neurolysis or nerve decompression) via CPT 64713 is covered for brachial plexus neuromas and other brachial plexus lesions. The clinical indication is relatively clear here. If you're billing 64713, your documentation should confirm the presence of a neuroma or defined lesion — not just chronic pain or vague neuropathy.
DREZ coagulation (dorsal root entry zone procedure) for brachial plexus avulsion is covered under CPT 63170. Brachial plexus avulsion is a specific, severe injury pattern — the nerve root is torn from the spinal cord. Your documentation and ICD-10 coding need to reflect that. Code G54.0 (brachial plexus disorders) or the injury codes S14.3XXA through S14.3XXS should anchor these claims.
Nerve grafting, nerve transfers, and soft tissue reconstruction — including triangle tilt surgery and the Mod-Quad procedure — are covered for obstetric brachial plexus injury (Erb's palsy) under ICD-10 P14.3. The critical timing requirement: functional recovery must not have occurred within three or more months. That three-month threshold is your documentation target. If your surgical notes don't explicitly address failed functional recovery at the three-month mark, you're handing Aetna a reason to deny reimbursement.
Relevant covered procedure codes for nerve grafting and transfers include CPT 64892, 64893 (single-strand nerve graft, arm or leg), 64897, 64898 (multiple-strand cable graft, arm or leg), 64901, 64902 (nerve graft add-ons), 64905, and 64907 (nerve pedicle transfer). These codes are covered when selection criteria are met — which means your clinical documentation must directly support the specific indication, not just describe the procedure performed.
Aetna's own policy notes there's no reliable evidence that one reconstructive soft tissue technique outperforms another for obstetric BPI. That's a meaningful statement. It tells you Aetna won't cover one technique over another based on surgical preference — but it also means they can't deny coverage for obstetric BPI reconstruction solely because you chose triangle tilt over Mod-Quad. Document medical necessity based on patient-specific factors, not technique preference.
Aetna Brachial Plexus Surgery Exclusions and Non-Covered Indications
This is where the December 20, 2025 update has the most bite. Aetna now explicitly designates seven approaches as experimental, investigational, or unproven. These aren't gray areas — they're hard exclusions under the updated coverage policy.
Bionic reconstruction for brachial plexus avulsion is excluded. This involves prosthetic devices combined with elective amputation and nerve-muscle transfers. If a patient is considering this path, know that Aetna will not cover it.
Computer-assisted DREZ micro-coagulation (CA-DREZ) is excluded, and it has a specific code consequence. CPT add-on code +20985 (computer-assisted surgical navigational procedure, image-less) is listed as not covered under CPB 0850. If your facility uses image-guidance technology for DREZ procedures, you cannot bill +20985 to Aetna for this indication. The underlying DREZ procedure via 63170 remains covered — the navigational add-on does not.
Minimally invasive intra-thoracic intercostal nerve harvesting is excluded. If your surgeons are using a thoracoscopic approach to harvest intercostal nerves for brachial plexus reconstruction, that approach is not covered. Standard open harvesting remains the supported technique.
Spinal accessory nerve transfer to the musculocutaneous nerve for birth brachial plexus palsy is excluded. This matters for pediatric cases. If your neurosurgeons are performing this transfer in neonates or infants with Erb's palsy, document carefully — Aetna's position is that evidence doesn't support it.
Therapeutic taping for scapular stabilization is excluded, mapped to CPT 29240 (shoulder strapping/Velpeau). This is often billed by physical therapists or as a component of postoperative care. Remove 29240 from any brachial plexus-related encounter protocols if Aetna is the payer.
Transfer of middle and posterior deltoid extended by the lateral intermuscular septum for elbow extension restoration is excluded. Document which specific muscle transfer technique is used — generic documentation won't survive a medical necessity review if the excluded technique is what was performed.
Vascularized brachial plexus allo-transplantation for traumatic brachial plexus injury is excluded. CPT 64912 and 64913 are listed as not covered for indications in CPB 0850. If you've been billing these codes for brachial plexus work, audit those claims immediately. Any claims submitted after December 20, 2025 using 64912 or 64913 for brachial plexus indications carry significant denial risk.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Neuroplasty for brachial plexus neuromas and lesions | Covered | CPT 64713, 64640; G54.0, D21.0, D21.10–D21.12 | Must document neuroma or defined lesion |
| DREZ coagulation for brachial plexus avulsion | Covered | CPT 63170; G54.0, S14.3XXA–S14.3XXS | Avulsion diagnosis required — not general BPI |
| Nerve grafting / nerve transfers for obstetric BPI (Erb's palsy) | Covered | CPT 64892, 64893, 64897, 64898, 64901, 64902, 64905, 64907; P14.3 | Requires documented failure of functional recovery at 3+ months |
| Soft tissue reconstruction (triangle tilt, Mod-Quad) for obstetric BPI | Covered | CPT 64905, 64907; P14.3, M21.821–M21.829 | No one technique preferred over another per Aetna |
| Bionic reconstruction for brachial plexus avulsion | Experimental | No covered code | Excluded entirely |
| Computer-assisted DREZ (CA-DREZ) | Experimental | CPT +20985 — not covered | Underlying 63170 remains covered; add-on excluded |
| Minimally invasive intra-thoracic intercostal nerve harvesting | Experimental | No specific code listed | Open harvesting remains covered approach |
| Spinal accessory nerve transfer to musculocutaneous nerve (birth BPI) | Experimental | No specific code listed | Pediatric cases — document technique specifically |
| Therapeutic taping for scapular stabilization | Experimental | CPT 29240 — not covered | Remove from BPI encounter order sets for Aetna |
| Deltoid transfer for elbow extension restoration | Experimental | No specific code listed | Document specific transfer technique in operative notes |
| Vascularized brachial plexus allo-transplantation | Experimental | CPT 64912, 64913 — not covered for indications in CPB 0850 | High claim denial risk — audit charge capture now |
Aetna Brachial Plexus Surgery Billing Guidelines and Action Items 2025
These are the steps your billing team and charge capture team need to take before December 20, 2025.
| # | Action Item |
|---|---|
| 1 | Remove CPT 64912 and 64913 from your brachial plexus charge capture templates. These nerve allograft codes are listed as not covered under CPB 0850 for brachial plexus indications. If they're sitting in your standard brachial plexus surgery order sets or charge sheets, claims submitted after the effective date carry significant denial risk. Fix this in your EHR billing rules before December 20, 2025. |
| 2 | Flag CPT +20985 as non-covered for brachial plexus indications. Your facility may bill this add-on for other orthopedic or spinal navigation procedures. But for any claim tied to brachial plexus surgery and an Aetna member, 20985 is out. Build a claim edit to catch this combination before it goes out the door. |
| 3 | Audit your obstetric BPI cases for the three-month functional recovery threshold. Pull all pending or recent claims for P14.3 with nerve graft or transfer codes. Confirm the clinical documentation explicitly states that functional recovery did not occur within three or more months. If the notes just describe the procedure and diagnosis without addressing the timeline, your medical necessity support is incomplete. Work with your clinical team to address this in operative and pre-op notes going forward. |
| 4 | Update your ICD-10 documentation protocols for brachial plexus avulsion cases. Avulsion is distinct from other brachial plexus injuries. Use S14.3XXA through S14.3XXS for traumatic cases and G54.0 for the disorder diagnosis. If your coders are defaulting to G54.0 alone without the injury code where applicable, you're missing specificity Aetna may require to support DREZ coverage. |
| 5 | Remove CPT 29240 from brachial plexus postoperative care protocols for Aetna patients. Therapeutic shoulder taping maps to 29240, and it's explicitly not covered under this policy. If your physical therapy team bills this as part of brachial plexus rehab, it will deny. Notify your PT billing contacts. |
| 6 | Talk to your compliance officer if your practice performs spinal accessory nerve transfers or deltoid transfers for brachial plexus cases. These are excluded techniques, but they don't have specific non-covered CPT codes listed in CPB 0850. The exposure is real — if Aetna requests records and the operative note documents an excluded technique, you have a potential medical necessity denial and a refund risk. Your compliance officer and billing consultant need to weigh in on how you document and bill these cases. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Brachial Plexus Surgery Under CPB 0850
Covered CPT Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 64713 | CPT | Neuroplasty, major peripheral nerve, arm or leg, open; brachial plexus |
| 64892 | CPT | Nerve graft (includes obtaining graft), single strand, arm or leg |
| 64893 | CPT | Nerve graft (includes obtaining graft), single strand, arm or leg |
| 64897 | CPT | Nerve graft (includes obtaining graft), multiple strands (cable), arm or leg |
| 64898 | CPT | Nerve graft (includes obtaining graft), multiple strands (cable), arm or leg |
| 64901 | CPT | Nerve graft |
| 64902 | CPT | Nerve graft |
| 64905 | CPT | Nerve pedicle transfer |
| 64907 | CPT | Nerve pedicle transfer |
| 63170 | CPT | Laminectomy with myelotomy (e.g., Bischof or DREZ type), cervical, thoracic, or thoracolumbar |
| 64640 | CPT | Destruction by neurolytic agent; other peripheral nerve or branch |
Not Covered / Experimental Codes
| Code | Type | Description | Reason |
|---|---|---|---|
| +20985 | CPT | Computer-assisted surgical navigational procedure for musculoskeletal procedures, image-less | CA-DREZ is experimental/investigational under CPB 0850 |
| 29240 | CPT | Strapping; shoulder (e.g., Velpeau) | Therapeutic taping for scapular stabilization is experimental |
| 64912 | CPT | Nerve repair; with nerve allograft, each nerve, first strand (cable) | Listed as not covered for indications in CPB 0850 |
| 64913 | CPT | Nerve repair; with nerve allograft, each additional strand | Listed as not covered for indications in CPB 0850 |
Key ICD-10-CM Diagnosis Codes
| Code | Description |
|---|---|
| G54.0 | Brachial plexus disorders |
| P14.3 | Other brachial plexus birth injury |
| S14.3XXA–S14.3XXS | Injury of brachial plexus |
| D21.0 | Benign neoplasm of connective and other soft tissue of head, face and neck |
| D21.10 | Benign neoplasm of connective and other soft tissue of upper limb, including shoulder |
| D21.11 | Benign neoplasm of connective and other soft tissue of upper limb, including shoulder |
| D21.12 | Benign neoplasm of connective and other soft tissue of upper limb, including shoulder |
| M21.821 | Other specified acquired deformities of upper arm [winged scapula] |
| M21.822 | Other specified acquired deformities of upper arm [winged scapula] |
| M21.823 | Other specified acquired deformities of upper arm [winged scapula] |
| M21.824–M21.829 | Other specified acquired deformities of upper arm [winged scapula] |
Get the Full Picture for CPT 64912
Track this policy across versions, search 1,500+ policies by CPT code, and get real-time alerts when any payer changes coverage.