TL;DR: Cigna Healthcare modified MM 0391 covering diaphragmatic/phrenic nerve stimulation, effective September 26, 2025. Here's what changes for billing teams.
Cigna Healthcare updated its coverage policy for diaphragmatic/phrenic (D/P) nerve stimulation under policy code MM 0391 in the Cigna system, effective September 26, 2025. This policy governs electrical stimulation of the diaphragm via the phrenic nerve — a treatment used primarily for patients who cannot breathe independently. The change touches three CPT codes (64575, 64580, 64590) and 13 HCPCS codes covering implantable neurostimulator components, from pulse generators to leads to external antennas.
If your practice or facility bills for diaphragm pacing systems, audit your charge capture and medical necessity documentation before September 26, 2025.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Cigna Healthcare |
| Policy | Diaphragmatic/Phrenic Nerve Stimulation |
| Policy Code | MM 0391 |
| Change Type | Modified |
| Effective Date | September 26, 2025 |
| Impact Level | High |
| Specialties Affected | Thoracic Surgery, Neurosurgery, Pulmonology, Spinal Cord Injury Rehabilitation, Pediatric Surgery |
| Key Action | Review medical necessity criteria and update documentation standards for CPT 64575, 64580, 64590 and all associated HCPCS codes before September 26, 2025 |
Cigna Diaphragmatic/Phrenic Nerve Stimulation Coverage Criteria and Medical Necessity Requirements 2025
The Cigna diaphragmatic/phrenic nerve stimulation coverage policy designates CPT codes 64575, 64580, and 64590 — along with 13 HCPCS device codes — as medically necessary when criteria in the applicable coverage position are met. That phrasing matters. It means Cigna will deny claims that don't document the specific qualifying conditions, even if the procedure was clinically appropriate.
D/P nerve stimulation works by electrically stimulating the phrenic nerve — the nerve that drives diaphragm contractions and controls breathing. Patients who can't breathe without mechanical support, typically those with high cervical spinal cord injuries or central hypoventilation syndrome, are the primary candidates. This is a high-cost implantable system, so Cigna scrutinizes medical necessity documentation on every claim.
The three CPT codes in this policy each cover a distinct part of the implant procedure. CPT 64575 is for open implantation of a neurostimulator electrode array at a peripheral nerve. CPT 64580 covers open implantation of a neurostimulator electrode array at a neuromuscular site. CPT 64590 handles insertion or replacement of the peripheral, sacral, or gastric neurostimulator pulse generator or receiver. All three require the same medical necessity threshold to be met — and that threshold has to be documented in the medical record before you submit.
Prior authorization requirements for D/P nerve stimulation under Cigna are standard for implantable neurostimulator systems of this type. Verify prior auth requirements with the specific Cigna plan before scheduling — commercial, Cigna Medicare Advantage, and Cigna + Oscar plans may have different prior authorization pathways. A claim denial for a $30,000+ implantable system because prior auth wasn't confirmed is a painful write-off that documentation could have prevented.
Reimbursement for D/P pacing systems involves both the surgical procedure codes and the device HCPCS codes. You need both sets coded correctly. Missing the device codes (C1767, C1778, C1816, and the others listed below) means leaving significant reimbursement on the table.
Cigna Diaphragmatic/Phrenic Nerve Stimulation Exclusions and Non-Covered Indications
The policy summary from Cigna does not enumerate a specific list of excluded indications in the data available for this update. That said, the "medically necessary when criteria are met" framing is Cigna's standard way of drawing a line. If the criteria aren't met, the claim gets denied — functionally treated as not covered.
The real exposure here is incomplete documentation, not necessarily wrong diagnosis codes. If a patient qualifies clinically but the chart doesn't show it, Cigna's reviewers will treat it the same as a non-covered case. Train your clinical staff to document the specific conditions that make a patient a D/P pacing candidate before the surgery is performed.
If your compliance officer or billing consultant has access to the full MM 0391 policy text, pull the criteria list directly and build it into your pre-authorization checklist. Don't rely on clinical judgment alone to satisfy a payer's written criteria.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| D/P nerve stimulation meeting Cigna medical necessity criteria | Covered | CPT 64575, 64580, 64590; HCPCS C1767, C1778, C1816, C1820, C1883, C1897, L8680, L8683, L8685, L8686, L8687, L8688, L8696 | All covered codes require criteria to be met; prior auth likely required |
| D/P nerve stimulation not meeting stated criteria | Not Covered | Same code set | Denial expected without documented qualifying conditions |
| Replacement of implantable pulse generator | Covered (when criteria met) | CPT 64590; HCPCS C1767, C1820, L8685, L8686, L8687, L8688 | Document medical necessity for replacement separately from original implant |
| External antenna replacement for implantable D/P stimulation device | Covered (when criteria met) | HCPCS L8696 | Replacement-specific code — document reason for replacement |
Cigna Diaphragmatic/Phrenic Nerve Stimulation Billing Guidelines and Action Items 2025
| # | Action Item |
|---|---|
| 1 | Pull your MM 0391 claims from the last 12 months and audit them against the updated criteria before September 26, 2025. Look for any claims where medical necessity documentation was thin. If those claims are still in a rebillable window, fix the documentation and resubmit. |
| 2 | Confirm prior authorization requirements with every applicable Cigna plan in your payer mix. Call your Cigna provider relations contact or check the portal directly. Don't assume prior auth requirements are the same across commercial, Medicare Advantage, and exchange plans. |
| 3 | Update your charge capture to include all applicable HCPCS device codes. For every D/P pacing implant, you should be billing CPT 64575 or 64580 for the electrode implantation, CPT 64590 for the pulse generator, and the matching HCPCS codes for each device component. Missing L8680 (implantable neurostimulator electrode), C1778 (neurostimulator lead), or the pulse generator codes (L8685–L8688) is a direct revenue loss. |
| 4 | Distinguish rechargeable from non-rechargeable pulse generators in your charge capture. Cigna and other payers track this distinction at the HCPCS level. L8685 and L8687 are rechargeable (single array and dual array, respectively). L8686 and L8688 are non-rechargeable. Billing the wrong one creates a medical necessity mismatch that can trigger a denial or audit. |
| 5 | Build a replacement-specific documentation workflow for CPT 64590 and L8696 claims. Replacement procedures require their own medical necessity justification. The original implant's documentation doesn't carry over. If your team bills L8696 (external antenna replacement) or CPT 64590 for a generator replacement, the chart needs to show why the replacement was necessary — device failure, end of battery life, clinical change — separately from the original implant record. |
| 6 | Loop in your compliance officer if you bill this across multiple facility types. D/P pacing billing looks different in a hospital outpatient department versus an ASC versus a physician office. If your organization bills in more than one setting, confirm that your charge capture and documentation standards are calibrated for each setting's rules under Cigna's updated policy. |
| 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 Diaphragmatic/Phrenic Nerve Stimulation Under MM 0391
Covered CPT Codes (When Medical Necessity Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 64575 | CPT | Open implantation of neurostimulator electrode array; peripheral nerve (excludes sacral nerve) |
| 64580 | CPT | Open implantation of neurostimulator electrode array; neuromuscular |
| 64590 | CPT | Insertion or replacement of peripheral, sacral, or gastric neurostimulator pulse generator or receiver |
Covered HCPCS Codes (When Medical Necessity Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| C1767 | HCPCS | Generator, neurostimulator (implantable), nonrechargeable |
| C1778 | HCPCS | Lead, neurostimulator (implantable) |
| C1816 | HCPCS | Receiver and/or transmitter, neurostimulator (implantable) |
| C1820 | HCPCS | Generator, neurostimulator (implantable), with rechargeable battery and charging system |
| C1883 | HCPCS | Adapter/extension, pacing lead or neurostimulator lead (implantable) |
| C1897 | HCPCS | Lead, neurostimulator test kit (implantable) |
| L8680 | HCPCS | Implantable neurostimulator electrode, each |
| L8683 | HCPCS | Radiofrequency transmitter (external) for use with implantable neurostimulator radiofrequency receiver |
| L8685 | HCPCS | Implantable neurostimulator pulse generator, single array, rechargeable, includes extension |
| L8686 | HCPCS | Implantable neurostimulator pulse generator, single array, non-rechargeable, includes extension |
| L8687 | HCPCS | Implantable neurostimulator pulse generator, dual array, rechargeable, includes extension |
| L8688 | HCPCS | Implantable neurostimulator pulse generator, dual array, non-rechargeable, includes extension |
| L8696 | HCPCS | Antenna (external) for use with implantable diaphragmatic/phrenic nerve stimulation device, replacement only |
A note on ICD-10 codes: The MM 0391 policy data does not specify qualifying ICD-10-CM diagnosis codes. Work with your clinical team and compliance officer to identify the diagnosis codes that align with Cigna's medical necessity criteria — typically codes for high cervical spinal cord injury, central alveolar hypoventilation, and related conditions that require ventilatory support. Submitting claims without a supporting diagnosis that maps to D/P pacing indications will generate denials regardless of how cleanly the procedure codes are billed.
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