O99.840
BillableBariatric surgery status complicating pregnancy, unspecified trimester
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is O99.840 an HCC code?
No. O99.840 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
O99.840 is the ICD-10-CM diagnosis code for bariatric surgery status complicating pregnancy, unspecified trimester. A pregnant woman has had weight loss surgery (such as gastric bypass) in the past, which can affect her pregnancy and nutritional status. The trimester of pregnancy is not specified in this code. O99.840 sits in the ICD-10-CM chapter for pregnancy, childbirth and the puerperium (o00-o9a), within the section covering other obstetric conditions, not elsewhere classified (o94-o9a).
O99.840 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 this code when the trimester is not documented or is unspecified; if trimester is known, use O99.841, O99.842, or O99.843.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O99.840 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.