FDG PET for Myocardial Viability | CMS Coverage Update

Summary: The Centers for Medicare & Medicaid Services modified its coverage policy for FDG PET imaging used to assess myocardial viability, effective May 15, 2026. Here's what changes for billing teams.

CMS FDG PET myocardial viability billing sits at the intersection of cardiology and nuclear medicine — two specialties where coverage policy disputes are expensive. The Centers for Medicare & Medicaid Services has updated this policy, and the changes affect how you document medical necessity, when prior authorization applies, and what your claims need to survive a review. This policy does not list specific CPT or HCPCS codes in the available policy data, so you'll need to verify exact code applicability with your Medicare Administrative Contractor before the May 15, 2026 effective date.

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Quick-Reference Table

Field	Detail Copy
Payer	CMS (Centers for Medicare & Medicaid Services)
Policy	FDG PET for Myocardial Viability
Policy Code	N/A
Change Type	Modified
Effective Date	May 15, 2026
Impact Level	High
Specialties Affected	Cardiology, Nuclear Medicine, Cardiac Surgery, Radiology
Key Action	Audit your FDG PET charge capture and documentation workflows before May 15, 2026

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CMS FDG PET Myocardial Viability Coverage Criteria and Medical Necessity Requirements 2026

FDG PET for myocardial viability has a specific and narrow role in Medicare coverage. CMS covers it when the scan directly informs a treatment decision — specifically, whether a patient with coronary artery disease and left ventricular dysfunction will undergo revascularization. That clinical context is the hinge everything else swings on.

The real issue here is that CMS has historically required tight documentation linking the PET scan to a pending treatment decision. This isn't a screening tool under the CMS coverage policy. It's a pre-procedural assessment for patients where revascularization is being considered but the functional status of the myocardium is uncertain.

Medical necessity documentation needs to show two things clearly. First, the patient has known or suspected ischemic left ventricular dysfunction. Second, the imaging result will directly change management — meaning revascularization proceeds or is ruled out based on the findings.

Prior Authorization Under This Policy

CMS fee-for-service Medicare does not require prior authorization for FDG PET myocardial viability in the traditional sense. But Medicare Advantage plans operating under CMS rules may impose their own prior authorization requirements. If your patient is on a Medicare Advantage plan, verify prior auth requirements with that specific plan before scheduling.

For traditional Medicare, the medical necessity documentation in the chart carries the weight that prior authorization would carry elsewhere. Inadequate documentation is the functional equivalent of a prior auth denial — your claim gets rejected at post-payment audit instead of pre-service.

The Coverage Policy and Medical Necessity Standard

CMS applies a "reasonable and necessary" standard under Section 1862(a)(1)(A) of the Social Security Act. For FDG PET myocardial viability, that means the scan must be:

#	Covered Indication Copy
1	Ordered by a physician managing the patient's coronary artery disease
2	Performed when conventional imaging (echocardiography, stress testing) has failed to define viability adequately
3	Directly tied to a revascularization decision in progress

This is the standard that has been in place, and the 2026 modification refines how CMS expects that standard to be documented and applied. Billing teams should treat this like any NCD-level change — the criteria matter more than the code.

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CMS FDG PET Myocardial Viability Exclusions and Non-Covered Indications

CMS does not cover FDG PET for myocardial viability as a standalone diagnostic tool when no revascularization decision is pending. This is a hard line, and it generates claim denial volume that's entirely preventable.

Common non-covered scenarios include:

Routine follow-up imaging. If the patient already had revascularization and you're using FDG PET to assess recovery, that's a different clinical question. It falls outside the covered indication for this policy.

Initial diagnosis of coronary artery disease. FDG PET myocardial viability is not covered as a first-line diagnostic tool. Conventional imaging comes first. If those results are adequate to make the treatment decision, the PET scan isn't covered.

Cases where revascularization is not a viable option. If the patient's comorbidities make surgery or PCI impossible, CMS will not cover the viability scan. The scan has to connect to a real treatment decision, not an academic one.

These exclusions aren't new. But the 2026 modification signals CMS is paying closer attention to how claims document the clinical decision pathway. If your claims don't show the treatment decision context, expect increased scrutiny.

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Coverage Indications at a Glance

Note: The available policy data does not list specific CPT or HCPCS codes. Verify applicable codes with your MAC before the May 15, 2026 effective date.

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CMS FDG PET Myocardial Viability Billing Guidelines and Action Items 2026

This is where the rubber meets the road. The modification is effective May 15, 2026. You have time to act, but not time to wait.

Copy Action Items

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CPT, HCPCS, and ICD-10 Codes for FDG PET Myocardial Viability Under This Policy

Important notice: The policy data available for this modification does not list specific CPT, HCPCS, or ICD-10 codes. The table below reflects this accurately. Do not bill based on assumed codes.

Covered CPT/HCPCS Codes (When Medical Necessity Criteria Are Met)

Code	Type	Description Copy
Not specified in available policy data	—	Verify applicable FDG PET myocardial viability codes directly with your MAC before May 15, 2026

Key ICD-10-CM Diagnosis Codes

Code	Description Copy
Not specified in available policy data	Verify applicable diagnosis codes with your MAC; typically includes ischemic cardiomyopathy and related LV dysfunction codes

What to do: Call or submit a written inquiry to your MAC. Ask specifically which codes they recognize for FDG PET myocardial viability under the updated CMS policy effective May 15, 2026. Get the answer in writing. MACs can differ in how they apply national guidance at the local level, and a local coverage determination from your MAC may exist that lists specific codes — check the LCD database on the CMS website for your contractor region.

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