TL;DR: Cigna Healthcare modified MM 0579, its coverage policy for cervical plexus nerve blocks, effective February 11, 2026. Billing under CPT 64999 requires meeting specific medical necessity criteria — here's what your billing team needs to know before submitting claims.
Cigna Healthcare updated MM 0579, the Cigna cervical plexus block coverage policy that governs anesthesia services for selected nerve blocks. This policy covers cervical plexus nerve blocks used for pre- and post-operative pain relief and anesthesia in procedures involving the neck, shoulder, and clavicle region. The only billable code under this policy is CPT 64999 — the unlisted nervous system procedure code — which means documentation quality and medical necessity justification will make or break your reimbursement on every claim.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Cigna Healthcare |
| Policy | Cervical Plexus Block — Anesthesia Services, Selected Nerve Blocks |
| Policy Code | MM 0579 |
| Change Type | Modified |
| Effective Date | February 11, 2026 |
| Impact Level | High (editorial assessment — not a policy-stated field) |
| Specialties Affected | Anesthesiology, Pain Management, General Surgery, Orthopedic Surgery, Head and Neck Surgery (editorial assessment — not a policy-stated field) |
| Key Action | Audit all CPT 64999 claims for cervical plexus blocks to confirm documentation meets Cigna's medical necessity criteria before submitting |
Cigna Cervical Plexus Block Coverage Criteria and Medical Necessity Requirements 2026
The Cigna cervical plexus block coverage policy under MM 0579 designates CPT 64999 as medically necessary when the applicable criteria are met. Those criteria center on the clinical appropriateness of using a cervical plexus nerve block for anesthesia or pain management in procedures involving the neck, shoulder, or clavicle region.
This is where the policy gets operationally tricky. CPT 64999 is an unlisted code by definition. There is no standard descriptor that automatically maps to a fee schedule rate. Cigna reviews these claims individually, which means your documentation has to carry the full weight of the medical necessity argument.
A cervical plexus block is administered to anesthetize or provide post-operative pain relief for procedures involving the neck, shoulder, or clavicle region. If the claim doesn't make that clinical connection explicit, expect a denial.
Cigna's coverage policy requires that the block be used in the context of pre- or post-operative pain relief or anesthesia. Blocks performed outside that context — or for indications Cigna doesn't recognize as covered under this policy — won't meet medical necessity standards. Document the surgical procedure, the anatomical region, and the specific role the cervical plexus block plays in the anesthesia or pain management plan.
The published policy summary does not address prior authorization requirements. Contact Cigna directly to determine whether pre-service review applies to your specific plans and patient population. Don't assume silence means approval.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Cervical plexus nerve block for pre-operative anesthesia — neck, shoulder, or clavicle procedures | Covered | CPT 64999 | Medical necessity criteria must be met; unlisted code requires individual claim review |
| Cervical plexus nerve block for post-operative pain relief — neck, shoulder, or clavicle procedures | Covered | CPT 64999 | Documentation must establish clinical indication and anatomical appropriateness |
Cigna Cervical Plexus Block Billing Guidelines and Action Items 2026
Cervical plexus block billing under MM 0579 is not a set-it-and-forget-it workflow. Because every claim routes through CPT 64999, your billing team carries more documentation responsibility than they would with a standard procedure-specific CPT code. Here's what to do before and after the February 11, 2026, effective date.
| # | Action Item |
|---|---|
| 1 | Audit your current 64999 claims for cervical plexus blocks now. Pull claims from the last 12 months where CPT 64999 was billed for cervical plexus nerve blocks on Cigna patients. Check denial rates. If you're seeing consistent claim denials, your current documentation workflow may already be falling short of Cigna's medical necessity standards under MM 0579. |
| 2 | Update your documentation templates before February 11, 2026. Every cervical plexus block claim needs to clearly identify the surgical procedure performed, the anatomical region involved (neck, shoulder, or clavicle), and whether the block was administered for pre-operative anesthesia or post-operative pain relief. Generic anesthesia notes won't hold up under individual claim review. |
| 3 | Build a standard cover letter or narrative for unlisted code submissions. CPT 64999 always requires supporting documentation because there's no standard fee schedule descriptor. Create a templated narrative that your anesthesiologists or pain management providers can customize per case. It should describe the procedure, the nerve block's clinical role, and the medical necessity rationale. Note: referencing comparable CPT codes for pricing is a general unlisted-code billing practice — it is not a requirement or guidance stated in MM 0579. Consult your billing consultant for guidance on your specific submission approach. |
| 4 | Confirm prior authorization requirements directly with Cigna. Call Cigna's provider line or check the provider portal for each patient's specific plan. Some Cigna plans require pre-service review for unlisted codes. Missing a prior auth requirement on a 64999 claim means you're looking at a denial that's very hard to overturn on appeal. |
| 5 | Check whether your patients' Cigna plans exclude this service. MM 0579 applies at the Cigna plan policy level, but individual plan documents can carve out coverage or impose additional restrictions. This is especially true for self-funded employer plans, where the employer sets the final coverage rules. Verify coverage at the individual plan level before the procedure — not after. |
| 6 | Talk to your compliance officer if your volume of cervical plexus blocks under Cigna is significant. The combination of an unlisted code, individual claim review, and a modified coverage policy is a high-exposure scenario. If cervical plexus blocks represent meaningful reimbursement volume in your practice, loop in your compliance officer or billing consultant before February 11, 2026, to review your documentation and submission workflows against the updated MM 0579 standards. |
CPT Codes for Cervical Plexus Block Under MM 0579
Covered CPT Codes (When Medical Necessity Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 64999 | CPT | Unlisted procedure, nervous system |
A note on CPT 64999: This code requires individual pricing and review by Cigna on every claim. There is no published fee schedule rate for unlisted codes. Reimbursement is determined case by case based on clinical documentation and Cigna's internal pricing methodology. Submit a detailed operative report, the anesthesia record, and a written narrative with every 64999 claim — without exception.
The source policy data for MM 0579 does not list specific ICD-10-CM diagnosis codes. Assign diagnosis codes based on the documented clinical picture in accordance with your payer and coding guidelines. The source policy data for MM 0579 also does not include HCPCS Level II codes.
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