TL;DR: The Centers for Medicare & Medicaid Services modified NCD 244, the national coverage determination governing Medicare phrenic nerve stimulator coverage, with an effective date of January 9, 2026. Here's what billing teams need to know before submitting claims.
CMS phrenic nerve stimulator coverage policy under NCD 244 has been updated, and if your facility implants or manages these devices, this change touches your prosthetic device billing directly. The policy covers phrenic nerve stimulator implantation for selected patients with partial or complete respiratory insufficiency. No specific CPT or HCPCS codes are listed in NCD 244 itself — which creates a documentation burden your billing team needs to address now, not after your first denial.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Centers for Medicare & Medicaid Services (CMS) |
| Policy | Phrenic Nerve Stimulator — NCD 244 |
| Policy Code | NCD 244 |
| Change Type | Modified |
| Effective Date | 2026-01-09 |
| Impact Level | Medium |
| Specialties Affected | Thoracic Surgery, Neurosurgery, Pulmonology, Spinal Cord Injury Rehabilitation, Critical Care |
| Key Action | Verify intact phrenic nerve and diaphragm documentation is in the medical record before billing — this is the primary medical necessity gate under the updated policy |
CMS Phrenic Nerve Stimulator Coverage Criteria and Medical Necessity Requirements 2026
NCD 244 is the National Coverage Determination governing Medicare coverage of phrenic nerve stimulators. The Centers for Medicare & Medicaid Services classifies these devices under the Prosthetic Devices benefit category.
The coverage standard is this: CMS covers implantation of a phrenic nerve stimulator for selected patients with partial or complete respiratory insufficiency. That phrase "selected patients" is doing a lot of work. The policy spells out what "selected" means, and your documentation has to prove it.
The device works by electrically stimulating the phrenic nerve to rhythmically contract the diaphragm and produce breathing. CMS has recognized it as a covered alternative to mechanical ventilation for patients who can't breathe adequately on their own. The clinical conditions that support coverage include respiratory paralysis from brain stem or cervical spinal cord lesions, and chronic pulmonary disease with ventilatory insufficiency.
Here's the hard medical necessity requirement: the patient must have an intact phrenic nerve and diaphragm. Without both, the device cannot work. CMS is explicit about this — if the phrenic nerve or diaphragm is compromised, the implant will fail to produce clinical benefit. That clinical reality is baked into the coverage policy.
Your pre-operative documentation needs to show phrenic nerve integrity. This means nerve conduction studies, imaging, or other objective evidence confirming the nerve and diaphragm are functional before you go to the OR. If that documentation isn't in the chart, your claim is exposed.
NCD 244 also cross-references the CMS coverage policy on Electrical Nerve Stimulation at NCD 160. Pull that policy and read it alongside NCD 244. The two policies interact, and your billing guidelines should account for both when building your documentation checklist.
Whether phrenic nerve stimulator billing requires prior authorization depends on your Medicare Administrative Contractor (MAC). NCD 244 itself does not specify a prior authorization requirement. But given the device's complexity, its surgical nature, and its classification as a prosthetic device, your MAC may impose local coverage determination (LCD) requirements that add documentation or prior auth steps. Check with your MAC before the effective date of January 9, 2026.
CMS Phrenic Nerve Stimulator Exclusions and Non-Covered Indications
NCD 244 does not designate the phrenic nerve stimulator as experimental or investigational — it's a covered device when criteria are met. But there's a critical clinical limitation that creates a de facto non-coverage situation.
If the patient's phrenic nerve is damaged or the diaphragm is non-functional, the device is not appropriate for that patient under this policy. CMS is direct: the device can only be effective if the phrenic nerve and diaphragm are intact. A patient without that anatomical prerequisite doesn't meet the medical necessity standard.
The policy also acknowledges a real-world scenario: nerve injury can occur during the surgical implant procedure itself. If sufficient injury happens during surgery, the device won't work, and the patient returns to mechanical ventilation. CMS is not saying this results in a claim denial after the fact — but it does mean your pre-operative documentation of nerve integrity is the key liability point. If you can't show intact nerve function before surgery, you're billing a claim you can't defend.
There are no other explicit exclusions in NCD 244. The policy is tightly scoped to the indications above.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Partial or complete respiratory insufficiency — general | Covered | Not specified in NCD 244 | Broad qualifying criterion; "selected patients" standard applies |
| Respiratory paralysis from brain stem lesions | Covered | Not specified in NCD 244 | Intact phrenic nerve and diaphragm required |
| Respiratory paralysis from cervical spinal cord lesions | Covered | Not specified in NCD 244 | Intact phrenic nerve and diaphragm required; MAC LCD may apply |
| Chronic pulmonary disease with ventilatory insufficiency | Covered | Not specified in NCD 244 | Must be candidate for phrenic stimulation, not just ventilator management |
| Patients dependent on intermittent or permanent mechanical ventilator | Covered | Not specified in NCD 244 | Device positioned as alternative to ventilator and permanent tracheotomy stoma |
| Patients with damaged or non-functional phrenic nerve | Not Covered | N/A | Device cannot produce clinical benefit without intact nerve |
| Patients with compromised diaphragm function | Not Covered | N/A | Device cannot produce diaphragm contraction without functional diaphragm |
CMS Phrenic Nerve Stimulator Billing Guidelines and Action Items 2026
The modified NCD 244 coverage policy takes effect January 9, 2026. Here's what your billing team and clinical documentation staff need to do before that date.
| # | Action Item |
|---|---|
| 1 | Pull your MAC's LCD for phrenic nerve stimulators. NCD 244 is the national floor, but your Medicare Administrative Contractor may have a local coverage determination that adds criteria, codes, or prior authorization requirements. Contact your MAC or check the CMS coverage database now — before January 9, 2026. |
| 2 | Build a pre-operative documentation checklist for phrenic nerve integrity. The medical necessity gate under NCD 244 is intact phrenic nerve and diaphragm. Your chart needs objective evidence — phrenic nerve conduction studies, fluoroscopic diaphragm assessment, or equivalent — before the surgical date. A missing pre-op nerve study is the fastest path to a claim denial. |
| 3 | Review NCD 160 on Electrical Nerve Stimulation alongside NCD 244. CMS cross-references these two policies. Your phrenic nerve stimulator billing guidelines should document how both policies apply to your patient population. If your billing team hasn't mapped the interaction, do it before January 9, 2026. |
| 4 | Audit your current charge capture for phrenic nerve stimulator claims. NCD 244 does not list specific CPT or HCPCS codes. That means your billing team has to confirm with your MAC which procedure codes are accepted for this device. Using the wrong code category — or miscategorizing the device outside the Prosthetic Devices benefit — will generate a denial that's hard to overturn. |
| 5 | Clarify reimbursement pathways for device cost. Phrenic nerve stimulators are implantable devices with significant cost. Your reimbursement for the device component versus the surgical procedure may run through separate billing lines. Know whether your facility is billing the device separately or bundled, and confirm that aligns with your MAC's billing guidelines. |
| 6 | Train your clinical documentation team on the post-implant failure scenario. CMS acknowledges that nerve injury during surgery can render the device non-functional. If that happens and the patient returns to mechanical ventilation, document the clinical course thoroughly. You're not automatically liable for the failed implant from a billing standpoint — but your records need to show the device was appropriate before surgery. |
| 7 | Loop in your compliance officer if phrenic nerve stimulator volume is significant. This is a surgical prosthetic device with no codes listed in the NCD itself and a clinical prerequisite that requires objective pre-op evidence. If you have meaningful volume here, your compliance officer should review your documentation and billing process before January 9, 2026. |
| 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 Phrenic Nerve Stimulators Under NCD 244
A Note on Code Availability
NCD 244 does not list specific CPT, HCPCS Level II, or ICD-10-CM codes in the policy document. This is one of the more frustrating aspects of this coverage policy for billing teams. You know the procedure is covered — but the NCD doesn't hand you the code set.
This is the same pattern you see in older NCDs that predate HCPCS and CPT code proliferation. CMS wrote the clinical coverage rule; the coding specifics live at the MAC level.
What to Do Instead
Contact your MAC and ask for the accepted procedure codes for phrenic nerve stimulator implantation under the Prosthetic Devices benefit. Your MAC's LCD or billing article will list the applicable CPT codes for the surgical implantation, the HCPCS codes for the device itself, and the ICD-10-CM diagnosis codes that support medical necessity.
Also check the CMS coverage database cross-reference to NCD 160 on Electrical Nerve Stimulation. That policy may clarify coding expectations for nerve stimulation devices that overlap with phrenic nerve stimulator billing.
Until your MAC confirms the accepted code set, do not assume standard nerve stimulator codes apply. The Prosthetic Devices benefit category has specific billing rules, and phrenic nerve stimulators are a specialized subset of implantable neurostimulation. Get the code confirmation in writing from your MAC before January 9, 2026.
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