TL;DR: Cigna Healthcare modified MM 0579, its cervical plexus block coverage policy, effective February 11, 2026. Billing teams coding these procedures under CPT 64999 need to verify medical necessity documentation before claims go out the door.
Cigna Healthcare updated MM 0579 — the coverage policy governing cervical plexus nerve blocks used for anesthesia and pain management in neck, shoulder, and clavicle procedures. The only applicable code under this policy is CPT 64999 (unlisted procedure, nervous system), and Cigna covers it when specific medical necessity criteria are met. If your practice bills nerve blocks in surgical or anesthesia contexts, this policy change is worth a close read before your next claim goes out.
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 | Medium |
| Specialties Affected | Anesthesiology, Pain Management, General Surgery, Orthopedic Surgery, Head and Neck Surgery |
| Key Action | Audit all claims billing CPT 64999 for cervical plexus blocks and confirm medical necessity documentation matches updated criteria before February 11, 2026 |
Cigna Cervical Plexus Block Coverage Criteria and Medical Necessity Requirements 2026
The Cigna Healthcare cervical plexus block coverage policy under MM 0579 in the Cigna system addresses a specific clinical scenario: pre- and post-operative pain relief and anesthesia for procedures involving the neck, shoulder, and clavicle region. This is not a broad nerve block policy. It targets cervical plexus blocks specifically.
CPT 64999 — unlisted procedure, nervous system — is the code Cigna designates for this service. Cigna considers it medically necessary when the applicable criteria in MM 0579 are met. That language matters. "Applicable criteria" means your documentation has to speak directly to those criteria, not just note that a block was performed.
The real issue with unlisted codes like CPT 64999 is that they require manual review almost every time. There is no fee schedule value attached to an unlisted procedure code by definition. Reimbursement is determined case-by-case, based on what you submit and how well your documentation maps to Cigna's stated criteria. A weak operative note or vague pain management rationale is a fast path to claim denial.
Prior authorization requirements for CPT 64999 under MM 0579 are not explicitly spelled out in the published policy summary. That does not mean prior auth is off the table. Unlisted codes frequently trigger prior authorization requirements at the plan level, even when the coverage policy itself doesn't mandate it. Check the specific plan before you bill.
Your anesthesiologists and surgeons need to know this policy exists. The documentation burden for unlisted codes falls on the clinical team, not just the billing team. If the procedure note doesn't connect the cervical plexus block to the covered clinical indication — pre- or post-operative pain relief for a neck, shoulder, or clavicle procedure — you're billing blind.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Cervical plexus block for pre-operative anesthesia in neck, shoulder, or clavicle procedures | Covered | CPT 64999 | Medical necessity criteria under MM 0579 must be met; documentation required |
| Cervical plexus block for post-operative pain relief in neck, shoulder, or clavicle procedures | Covered | CPT 64999 | Same criteria apply; operative note must support the indication |
The policy summary does not enumerate additional indications beyond pre- and post-operative use for neck, shoulder, and clavicle procedures. If you're billing CPT 64999 for cervical plexus blocks in other clinical contexts, those claims fall outside this policy's stated coverage and carry higher denial risk.
Cigna Cervical Plexus Block Billing Guidelines and Action Items 2026
The Cigna MM 0579 policy update is effective February 11, 2026. Here's what your billing team and clinical documentation teams need to do now.
| # | Action Item |
|---|---|
| 1 | Pull all CPT 64999 claims from the last 90 days for cervical plexus blocks. Compare your documentation against the MM 0579 criteria. If you're already denying on these, this audit will tell you why. |
| 2 | Update your charge capture workflows before February 11, 2026. Any cervical plexus block billing CPT 64999 to Cigna should trigger a documentation checklist that confirms the procedure involved the neck, shoulder, or clavicle region and that the block was used for pre- or post-operative pain relief or anesthesia. |
| 3 | Flag CPT 64999 for pre-submission review on all Cigna claims. Unlisted codes don't move through automated edits the same way named procedure codes do. Build a manual review step into your workflow specifically for this code. |
| 4 | Contact Cigna directly to confirm prior authorization requirements at the plan level. MM 0579 doesn't spell out a blanket prior auth requirement, but individual Cigna plans vary. Getting a no-auth assumption wrong on an unlisted code is an expensive mistake. |
| 5 | Brief your anesthesiologists and surgeons on the documentation standard. The operative note needs to explicitly state the clinical rationale for the cervical plexus block — the specific procedure performed, the anatomic region, and the role of the block in the patient's pain management or anesthesia plan. Generic notes don't hold up under Cigna's manual review for CPT 64999. |
| 6 | If you're seeing inconsistent reimbursement on these claims, escalate. Unlisted procedure codes are inherently inconsistent payers, and Cigna's adjudication of CPT 64999 for cervical plexus blocks can vary. Document the reimbursement decisions you receive and build a rate reference so you can flag outliers. If patterns look wrong, loop in your billing consultant before writing off the variance. |
One thing worth saying plainly: the February 11, 2026 effective date is recent. If you haven't audited your cervical plexus block billing process since this policy was updated, you may already have claims out that don't align with the current criteria. Run the audit now, not at the end of the quarter.
Cigna Cervical Plexus Block Exclusions and Non-Covered Indications
The published MM 0579 policy summary does not enumerate specific exclusions or experimental designations for cervical plexus blocks. That's actually common with unlisted code policies — the coverage criteria define what's in, and anything outside those criteria is implicitly excluded by default.
The practical exclusion here is context. Cervical plexus block billing under MM 0579 is specifically anchored to procedures involving the neck, shoulder, and clavicle region. A cervical plexus block performed in a different clinical context — or without documentation linking it to one of those anatomic sites — is going to look like an uncovered service when Cigna reviews the claim.
If your practice uses cervical plexus blocks for indications beyond what MM 0579 describes, talk to your compliance officer before billing those under this policy. The risk of claim denial — and potential overpayment issues on previously paid claims — is real when the coverage criteria are this specific and the code is unlisted.
| 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 Cervical Plexus Blocks Under MM 0579
The MM 0579 policy data lists one applicable code. The table below reflects the exact code from the Cigna policy document.
Covered CPT Codes (When Medical Necessity Criteria Are Met)
| Code | Type | Description | Coverage Status |
|---|---|---|---|
| 64999 | CPT | Unlisted procedure, nervous system | Considered medically necessary when criteria in MM 0579 are met |
No additional CPT, HCPCS, or ICD-10 codes are listed in the MM 0579 policy data. Do not assume that other nerve block codes (such as CPT 64490, 64493, or others in the 64400–64530 range) fall under this policy. MM 0579 specifically governs cervical plexus blocks billed as unlisted procedures under CPT 64999.
If you believe a more specific CPT code applies to a cervical plexus block your practice performs, that's worth a conversation with your billing consultant. Billing a more specific named procedure code — if one exists and accurately describes the service — is almost always preferable to billing CPT 64999. Unlisted codes carry more administrative burden, lower reimbursement predictability, and higher denial rates than their named equivalents.
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