Percutaneous Image-Guided Lumbar Decompression for Lumbar Spinal Stenosis — NCD 358 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 358 governing PILD (percutaneous image-guided lumbar decompression) coverage, with an effective date of 2026-03-04. Coverage remains restricted to beneficiaries enrolled in approved clinical studies under Coverage with Evidence Development (CED). Here's what billing teams need to know.

CMS PILD coverage policy under NCD 358 has not opened up broad Medicare reimbursement for this procedure. If your practice or facility bills for lumbar spinal stenosis treatments, this update matters. The policy does not list specific CPT or HCPCS codes, which creates real documentation and claim submission challenges your billing team needs to address now.

---

Quick-Reference Table

Field	Detail Copy
Payer	CMS (Centers for Medicare & Medicaid Services)
Policy	Percutaneous Image-Guided Lumbar Decompression for Lumbar Spinal Stenosis
Policy Code	NCD 358
Change Type	Modified
Effective Date	2026-03-04
Impact Level	High
Specialties Affected	Interventional Pain Management, Spine Surgery, Orthopedic Surgery, Neurosurgery, Outpatient Hospital Facilities
Key Action	Confirm active CED study enrollment before billing any PILD procedure for Medicare beneficiaries

---

CMS PILD Coverage Criteria and Medical Necessity Requirements 2026

The real issue with NCD 358 Medicare coverage is this: PILD is not covered as a standard Medicare benefit. The Centers for Medicare & Medicaid Services covers PILD only through Coverage with Evidence Development, meaning your patient must be enrolled in a qualifying clinical study before any claim has a shot at reimbursement.

This is a CED-only coverage policy. That distinction is not a technicality — it's the entire framework governing payment. If a patient isn't enrolled in an approved study meeting NCD 358 criteria, the claim will be denied. Full stop.

What Is PILD?

PILD is a posterior decompression of the lumbar spine. It's performed under indirect image guidance — fluoroscopic or CT — without direct visualization of the surgical area.

The procedure uses specially designed instruments to percutaneously remove part of the lamina and reduce the size of the ligamentum flavum. Contrast media and epiduragram confirm and monitor the compressed area. CMS describes this as a treatment for symptomatic lumbar spinal stenosis (LSS) unresponsive to conservative therapy.

Medical Necessity Under CED

For PILD billing to meet medical necessity under this coverage policy, two conditions must be true simultaneously. First, the patient has LSS that has not responded to conservative therapy. Second, the patient is actively enrolled in a CMS-approved clinical study.

Meeting just the clinical criterion isn't enough. The study enrollment requirement is non-negotiable for Medicare payment.

What the Approved Study Must Cover

CMS has specific research questions it wants these studies to answer. A qualifying study must address at least one of the following:

#	Covered Indication Copy
1	Does PILD provide a clinically meaningful improvement in function and/or quality of life compared to other LSS treatments?
2	Does PILD provide clinically meaningful pain reduction compared to other treatments?
3	Does PILD affect overall clinical management and decision-making for LSS, including use of other medical services?

The study design must be prospective, randomized, and controlled. It must use validated measurement instruments and clinically appropriate comparators — including medical or surgical interventions or a sham-controlled arm for the non-PILD group.

Study Protocol Requirements for CMS Approval

CMS requires the study protocol to specify a statistical analysis plan and a minimum patient follow-up period. The protocol must evaluate how patient characteristics affect health outcomes and how long any benefit lasts.

Beyond clinical design, the study must meet these criteria:

If the study is regulated by the FDA, it must also comply with FDA regulations for human subject protection.

Prior Authorization and CED Enrollment

This policy doesn't frame coverage in terms of traditional prior authorization. The CED enrollment requirement functions like a permanent prior authorization gate. Before any PILD procedure on a Medicare beneficiary, you need documented proof of study enrollment. Without that documentation, your claim has no path to payment.

If your facility is considering participating in a PILD study, talk to your compliance officer before the effective date. The study approval process through CMS involves its own documentation and qualification steps that sit entirely outside normal billing workflows.

---

CMS PILD Exclusions and Non-Covered Indications

PILD performed outside an approved clinical study is not covered under Medicare. This applies regardless of the patient's clinical presentation or how severe their LSS is.

The policy does not carve out exceptions for patients who might be "good candidates" based on clinical judgment alone. CMS has explicitly determined that the evidence base for PILD does not yet support broad coverage. That's the entire rationale for the CED framework.

PILD billing for Medicare beneficiaries outside a qualifying study will generate a claim denial. There's no appeal argument that overcomes the absence of study enrollment.

---

Coverage Indications at a Glance

Indication	Status	Relevant Codes	Notes Copy
LSS unresponsive to conservative therapy — patient enrolled in CMS-approved CED study	Covered	Not specified in NCD 358	Study must meet prospective, randomized, controlled design requirements; effective for services on or after January 9, 2014
LSS — patient NOT enrolled in an approved CED study	Not Covered	Not specified in NCD 358	No exceptions; claim will be denied regardless of clinical severity
PILD performed outside prospective, randomized, controlled study framework	Not Covered	Not specified in NCD 358	Observational studies or registries alone do not qualify

---

CMS PILD Billing Guidelines and Action Items 2026

PILD billing under NCD 358 is narrow, and the margin for error is small. These are the steps your billing and revenue cycle team should take now, ahead of the March 4, 2026 effective date.

Copy Action Items

---

CPT, HCPCS, and ICD-10 Codes for PILD Under NCD 358

Covered CPT and HCPCS Codes

NCD 358 does not list specific CPT or HCPCS codes. This is a significant gap in the policy as written.

Your billing team cannot rely on the NCD alone to determine which procedure codes to use for PILD claims. Contact your MAC directly to get guidance on the appropriate codes for PILD procedures performed under a qualifying CED study.

Document whatever guidance your MAC provides. You want a paper trail if a claim is denied and you need to appeal.

Key ICD-10-CM Diagnosis Codes

NCD 358 does not list specific ICD-10-CM diagnosis codes. The policy references lumbar spinal stenosis (LSS) as the covered diagnosis condition. Work with your coding team and MAC to confirm the appropriate ICD-10-CM codes — such as codes within the M48.0x spinal stenosis category — for PILD claims under this NCD.

Do not bill ICD-10 codes without confirming they align with your MAC's PILD billing guidance. The absence of codes in the NCD is not permission to use any LSS code — it's a signal that you need to verify before you bill.

---