M1300 HCPCS Level II code: Influenza immunization was not administered for reasons documented by clinician (e.g., patient allergy or other medical reasons, patient declined or other…
M1300 is the HCPCS code for “Influenza immunization was not administered for reasons documented by clinician (e.g., patient allergy or other medical reasons, patient declined or other patient reasons, vaccine not available or…” in CMS’s October 2026 release, in effect from Oct 1, 2026.
Official description
M1300Influenza immunization was not administered for reasons documented by clinician (e.g., patient allergy or other medical reasons, patient declined or other patient reasons, vaccine not available or other system reasons)
Short description: Flu imm no admin doc rea
HCPCS · United States
Medicare details
The indicators CMS publishes with M1300 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Medicare pricing
- Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)
- Type of service
- Medical care
- BETOS category
- Undefined codes
- Added
- Jan 1, 2024
Where M1300 sits
- 1M codesMedical services and quality measures
- 2Active code M1300Influenza immunization was not administered for reasons documented by clinician (e.g., patient allergy or other medical reasons, patient declined or other patient reasons, vaccine not available or other system reasons)
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code M1300 mean?
M1300 is the HCPCS code for “Influenza immunization was not administered for reasons documented by clinician (e.g., patient allergy or other medical reasons, patient declined or other patient reasons, vaccine not available or other system reasons)” in CMS’s HCPCS Level II October 2026 release.
Does Medicare cover M1300?
CMS lists M1300’s Medicare coverage as “Carrier judgment” and its pricing as “Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside M1300
All M codesM1294Normal blood pressure reading documented, follow-up not requiredM1295Patients with a diagnosis or past history of total colectomy or colorectal cancerM1296Bmi is documented within normal parameters and no follow-up plan is requiredM1297Bmi not documented due to medical reason or patient refusal of height or weight measurementM1298Documentation of patient pregnancy anytime during the measurement period prior to and including the current encounterM1299Influenza immunization administered or previously receivedM1301Patient identified as a tobacco user received tobacco cessation intervention during the measurement period or in the six months prior to the measurement period (counseling and/or…M1302Screening, diagnostic, film digital or digital breast tomosynthesis (3d) mammography results documented and reviewedM1303Hospice services provided to patient any time during the measurement periodM1304Patient did not receive any pneumococcal conjugate or polysaccharide vaccine on or after their 19th birthday and before the end of the measurement periodM1305Patient received any pneumococcal conjugate or polysaccharide vaccine on or after their 19th birthday and before the end of the measurement periodM1306Patient had anaphylaxis due to the pneumococcal vaccine any time during or before the measurement period