CMS Vitrectomy Coverage Policy Updated: What Billing Teams Need to Know About NCD 18

The Centers for Medicare & Medicaid Services (CMS) has issued a modification to National Coverage Determination (NCD) 18, the federal policy governing Medicare reimbursement for vitrectomy procedures. This update, effective March 12, 2026, refines coverage guidance under policy key 18-v2 and directs billing teams to specific chapters of the Medicare Claims Processing Manual for physician and ambulatory surgical center (ASC) payment determinations. If your practice or facility bills vitrectomy services to Medicare, this policy affects how you validate medical necessity and how you handle code bundling.

What Changed in the CMS Vitrectomy NCD 18 Policy (2026 Update)

NCD 18 has governed Medicare vitrectomy coverage for years under the CIM 35-16 framework. The 2026 modification does not introduce new covered indications or eliminate existing ones — but it does sharpen the administrative cross-references that billing teams must follow to determine payment correctly.

Specifically, the updated policy now explicitly directs claims processors and billing staff to two distinct sections of the Medicare Claims Processing Manual:

• Chapter 14, §40 — for ASC facility vitrectomy payment determinations
• Chapter 23, §20.9 — for identifying when vitrectomy codes are bundled into other procedure codes, or when other service codes already include vitrectomy

That bundling guidance in Chapter 23, §20.9 is the detail most likely to affect your denial rate. If your team hasn't built that logic into claim scrubbing workflows, you're at risk of submitting unbundled claims that CMS considers duplicative.

CMS Medicare Coverage Criteria for Vitrectomy

Under NCD 18 (policy key 18-v2), CMS considers vitrectomy reasonable and necessary when performed for the following conditions:

These five indications define the outer boundary of what CMS will cover under medical necessity. Procedures performed outside these indications — or without documentation clearly tying the clinical presentation to one of them — are vulnerable to denial on medical necessity grounds.

There is no prior authorization requirement referenced in this NCD. However, the absence of a prior auth requirement does not reduce your documentation burden. CMS can and does conduct post-payment audits on vitrectomy claims, and medical necessity must be demonstrable in the medical record, not just in the claim.

Benefit Categories and Care Settings Under NCD 18

CMS covers vitrectomy under two benefit categories:

1. Physicians' Services — governing the professional component billed by the operating surgeon
2. Ambulatory Surgical Center Facility Services — governing the facility fee when the procedure is performed in a Medicare-certified ASC

This dual-category structure means billing teams at both physician practices and ASC facilities need to be aligned on the updated manual references. The payment calculation methodology differs by setting, and Chapter 14 (ASC) versus Chapter 23 (physician fee schedule) handle those calculations separately.

If your facility bills the professional and technical components under a global arrangement, or if you have an arrangement where the surgeon is employed by the ASC, verify that your billing setup correctly applies the appropriate chapter guidance for each component.

Vitrectomy Code Bundling: The Critical Issue in This Policy Update

The explicit reference to Medicare Claims Processing Manual Chapter 23, §20.9 is not administrative boilerplate — it's a signal that CMS wants billing teams paying attention to code bundling in vitrectomy claims.

Bundling edits in the Medicare Correct Coding Initiative (CCI) apply when a vitrectomy code is considered inclusive of another procedure being billed on the same claim, or vice versa. Common scenarios where this surfaces include:

• Vitrectomy performed at the same session as retinal photocoagulation
• Vitrectomy performed alongside membrane peeling or endolaser
• Vitrectomy billed as a standalone when the primary procedure code already includes vitreous work by definition

Chapter 23, §20.9 is where CMS instructs you to determine which codes are inclusive and which can be billed separately. If your billing team or clearinghouse is not cross-referencing this section when scrubbing vitrectomy claims, unbundling denials are a predictable outcome.

Affected Codes

The updated NCD 18 policy (18-v2) does not enumerate specific CPT or HCPCS codes within the policy document itself. CMS directs billing teams to the Medicare Claims Processing Manual for code-level determinations, particularly Chapter 23, §20.9 for bundling rules and Chapter 14, §40 for ASC facility payment codes.

No specific CPT, HCPCS, or ICD-10-CM codes are listed in the policy data for this NCD. Do not rely on assumed code lists — consult the referenced manual chapters directly for your applicable code set.

What Your Billing Team Should Do