O98.312
BillableOther infections with a predominantly sexual mode of transmission complicating pregnancy, second trimester
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is O98.312 an HCC code?
No. O98.312 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
O98.312 is the ICD-10-CM diagnosis code for other infections with a predominantly sexual mode of transmission complicating pregnancy, second trimester. A sexually transmitted infection (other than those specifically named) occurring during the second trimester of pregnancy that may affect the mother and developing baby. O98.312 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).
O98.312 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 specific sexually transmitted infection is not HIV, syphilis, gonorrhea, or chlamydia.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O98.312 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code when the specific sexually transmitted infection is not HIV, syphilis, gonorrhea, or chlamydia
- •Ensure the trimester is clearly documented in the medical record; second trimester is weeks 14-20