O29.021
BillablePressure collapse of lung due to 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 O29.021 an HCC code?
No. O29.021 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
O29.021 is the ICD-10-CM diagnosis code for pressure collapse of lung due to anesthesia during pregnancy, first trimester. Collapse of lung tissue due to pressure changes from anesthesia during the first trimester of pregnancy, affecting the mother's ability to breathe. O29.021 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).
O29.021 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.
The fifth character '1' indicates first trimester; document the gestational age to support this timing.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O29.021 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •The fifth character '1' indicates first trimester; document the gestational age to support this timing
- •Differentiate this from aspiration pneumonitis (O29.01x) by reviewing the mechanism of lung collapse