A34
BillableObstetrical tetanus
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A34 an HCC code?
No. A34 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A34 is the ICD-10-CM diagnosis code for obstetrical tetanus. Tetanus infection that develops in a pregnant woman or during the postpartum period, typically from contamination of the birth canal or delivery wounds. This is a serious bacterial infection caused by toxins from Clostridium tetani that can affect both mother and fetus. A34 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).
A34 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
A34 is specific to obstetrical tetanus and should only be used for pregnant women, women in labor, or postpartum women; do not use for non-pregnant patients with tetanus.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A34 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •A34 is specific to obstetrical tetanus and should only be used for pregnant women, women in labor, or postpartum women; do not use for non-pregnant patients with tetanus
- •This code should be used as a secondary diagnosis when coding obstetrical cases; ensure the pregnancy status is also coded with appropriate O-codes (O00-O9A range) to capture the complete clinical picture