Question 1

What is ICD-10 code O09.90?

Accepted Answer

O09.90 is the ICD-10-CM diagnosis code for supervision of high risk pregnancy, unspecified, unspecified trimester. Medical supervision of a high-risk pregnancy when the specific risk factor is not identified or documented, and the trimester is unspecified. O09.90 sits in the ICD-10-CM chapter for pregnancy, childbirth and the puerperium (o00-o9a), within the section covering supervision of high risk pregnancy (o09).

O09.90 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.

This is a less specific code; use only when no other O09 code applies and the reason for high-risk classification cannot be determined.

Question 2

Is O09.90 an HCC code?

Accepted Answer

No. O09.90 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is O09.90 billable?

Accepted Answer

Yes. O09.90 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. O09.90 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for O09.90?

Accepted Answer

O09.90 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither community model rewards O09.90 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

Question 5

What should coders know when reporting O09.90?

Accepted Answer

This is a less specific code; use only when no other O09 code applies and the reason for high-risk classification cannot be determined Query the provider if possible to identify the specific high-risk condition for more accurate coding

HCC Buddy Code Card

O09.90

Is O09.90 an HCC code?

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work O09.90 in HCC Buddy

O09.90 ICD-10-CM Code: Supervision of high risk pregnancy, unspecified, unspecified trimester

HCC Buddy Code Card

O09.90

Is O09.90 an HCC code?

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work O09.90 in HCC Buddy