Food Allergy Testing and Treatment — NCD 266 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 266, its food allergy testing and treatment coverage policy, with an updated record date of January 9, 2026. The exclusion itself hasn't changed — sublingual, intracutaneous, and subcutaneous provocative and neutralization testing and neutralization therapy for food allergies remain non-covered under Medicare — but billing teams need to confirm their workflows reflect this standing exclusion before submitting claims.

Quick-Reference Table

CMS Food Allergy Testing Coverage Criteria and Medical Necessity Requirements 2026

The CMS food allergy testing coverage policy under NCD 266 is blunt: Medicare does not cover sublingual, intracutaneous, or subcutaneous provocative and neutralization testing for food allergies. It also does not cover neutralization therapy for food allergies. These exclusions took effect October 31, 1988, following a Final Notice published in the Federal Register on September 29, 1988.

The policy exists because available evidence does not show these tests and therapies are effective. That's not a gray area. CMS reviewed the evidence and drew a hard line.

The January 9, 2026 effective date on this update does not change the exclusion itself. What it signals is that this policy remains active, remains enforceable, and is on CMS's radar. If your practice offers any of these services to Medicare beneficiaries, the medical necessity bar for coverage isn't just high — it's a wall. These services don't meet it under any circumstances within this NCD.

There is no prior authorization pathway for these services under NCD 266. Prior authorization requires a covered service. Since CMS has excluded these tests and therapies outright, there's no authorization process that unlocks reimbursement. A prior auth request won't help here.

CMS Food Allergy Testing Exclusions and Non-Covered Indications

NCD 266 is one of the clearest exclusion policies CMS has on the books. All four of the following are non-covered:

The policy language is specific about the route of administration and the purpose. "Provocative and neutralization" testing is a distinct methodology — it's not the same as standard allergy skin testing or food challenge protocols used in mainstream allergy practice. But billing teams should understand that the exclusion covers the full category of provocative-neutralization methodology for food allergies, regardless of how the service is documented in the chart.

This distinction matters in billing. Standard skin testing for environmental allergens or IgE-based allergy evaluation is a different clinical service. CMS food allergy testing billing under NCD 266 applies specifically to the provocative-neutralization approach. Don't let the word "food allergy" alone trigger a blanket exclusion assumption for every allergy service your practice bills.

The real exposure here is for practices in integrative medicine, naturopathic care, or functional medicine settings that offer these services and may have Medicare patients. If a Medicare beneficiary receives sublingual or subcutaneous neutralization therapy for food allergies at your practice, you're looking at a near-certain claim denial.

Coverage Indications at a Glance

CMS Food Allergy Testing Billing Guidelines and Action Items 2026

The January 9, 2026 update to NCD 266 is a reaffirmation, not a new restriction. But it's a signal worth acting on. Here's what your billing team should do now.

If you're unsure how this exclusion applies to your specific payer mix or patient population, talk to your compliance officer before the effective date of January 9, 2026 passes without a review.

CPT, HCPCS, and ICD-10 Codes for Food Allergy Testing Under NCD 266

No Codes Specified in NCD 266

The Centers for Medicare & Medicaid Services did not list specific CPT, HCPCS Level II, or ICD-10-CM codes in NCD 266. This is notable and worth understanding.

The absence of specific codes in this NCD is not unusual for older national coverage determinations. The policy was originally published in 1988, before the current HCPCS and CPT coding structures were fully standardized for these services. CMS's position is a categorical exclusion of the methodology — sublingual, intracutaneous, and subcutaneous provocative and neutralization testing, plus neutralization therapy — rather than a code-specific exclusion.

That creates a practical challenge for food allergy testing billing. Your coding team can't simply flag a code list in your billing system and call it done. You need to identify which codes your practice currently uses to bill these specific services and apply the Medicare exclusion at the code level internally.

Common codes that practices use for provocative-neutralization food allergy services may include allergy testing and injection codes, but you should not assume any specific code maps to this exclusion without reviewing how your practice bills these services. Work with your billing consultant to map your internal codes to the NCD 266 exclusion categories.

If your practice uses any code for sublingual testing, intracutaneous or subcutaneous provocative food challenge protocols, or neutralization therapy specifically for food allergies, treat that code as non-covered under Medicare until you have documentation showing otherwise.

This is one of those policy situations where ambiguity in the code list creates more compliance risk, not less. The exclusion is clear. The coding is your responsibility to operationalize.