M1171 – Patient received at least one td vaccine or one tdap vaccine between nine years prior to the encounter and the end of the measurement period

HCPCS Level II code · M codes: Medical Services and Quality Measures

Active code Carrier judgment

HCPCS codeM1171
Long description
Patient received at least one td vaccine or one tdap vaccine between nine years prior to the encounter and the end of the measurement period
Short description
Pt recd 1 td/tdap 9yrs prior
Pricing indicator
00 Not separately priced by Part B (bundled, not covered or Part A only)
Medicare coverage
C Carrier judgment – coverage decided by the Medicare contractor
BETOS category
Z2 Undefined codes
Added
January 1, 2023
Last change
January 1, 2023 – No change

Frequently asked questions

What is HCPCS code M1171?

M1171 is a HCPCS Level II code for patient received at least one td vaccine or one tdap vaccine between nine years prior to the encounter and the end of the measurement period.

Does Medicare cover M1171?

The HCPCS file lists coverage code C: Carrier judgment – coverage decided by the Medicare contractor. Coverage and payment also depend on local coverage determinations and the patient’s plan.

Nearby M codes

Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.