O29.91
BillableUnspecified complication of anesthesia during pregnancy, first trimester
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is O29.91 an HCC code?
No. O29.91 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
O29.91 is the ICD-10-CM diagnosis code for unspecified complication of anesthesia during pregnancy, first trimester. A pregnant woman in her first trimester experiences a complication from anesthesia, but the specific type of complication is not documented. O29.91 sits in the ICD-10-CM chapter for pregnancy, childbirth and the puerperium (o00-o9a), within the section covering other maternal disorders predominantly related to pregnancy (o20-o29).
O29.91 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.
Use when the trimester is known but the specific anesthesia complication cannot be determined.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O29.91 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use when the trimester is known but the specific anesthesia complication cannot be determined
- •Review anesthesia records and operative notes to identify the specific complication if possible