HCPCS Code M1311

Anaphylaxis due to the vaccine on or before the date of the encounter
Code effective Jan 01, 2024

HCPCS Section
Medical services

M1311 is a valid 2026 HCPCS code meaning Anaphylaxis due to the vaccine on or before the date of the encounter or (Aphlx to vax bef enc) for short. HCPCS M1311 has been effective since 01/01/2024 and applies to Medical care.

HCPCS Code Details - M1311

HCPCS Level II Code
Section M - Medical services
HCPCS Code M1311
Description

Long description:
Anaphylaxis due to the vaccine on or before the date of the encounter

Short description:
Aphlx to vax bef enc

HCPCS Pricing indicator 00 - Physician Fee Schedule And Non-Physician Practitioners - Service not separately priced by part B (e.g., services not covered, bundled, used by Part A only, etc.)
Multiple pricing indicator 9 - Not applicable as HCPCS not priced separately by part B or value is not established
Coverage code C - Carrier judgment
BETOS2 code Z2 - Undefined codes
HCPCS Action code N - No maintenance for this code
Type of service 1 - Medical care
Effective date Effective Jan 01, 2024
Date added Added Jan 01, 2024

See also

  • HCPCS M1310 · Patient screened for tobacco use and received tobacco cessation intervention during the measurement period or in the six months prior to the measurement period (counseling, pharmacotherapy, or both), if identified as a tobacco user

  • HCPCS M1219 · Anaphylaxis due to the vaccine on or before the date of the encounter

  • HCPCS M1312 · Patient not screened for tobacco use

1 Two-digit numeric codes are Level I code modifiers copyrighted© by the American Medical Association's Current Procedural Terminology (CPT).

2 BETOS stands for “Berenson-Eggers Type Of Service”

HCPCS Level II codes and descriptors are approved and maintained jointly by the alpha-numeric editorial panel (consisting of CMS, the Health Insurance Association of America, and the Blue Cross and Blue Shield Association). — Updated 6/23/2026

CPT® is a registered trademark of the American Medical Association (AMA). All rights reserved.