Question 1

What is ICD-10 code O26.839?

Accepted Answer

O26.839 is the ICD-10-CM diagnosis code for pregnancy related renal disease, unspecified trimester. Kidney disease related to pregnancy when the specific timing during pregnancy is not documented or specified. O26.839 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).

O26.839 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 only when trimester cannot be determined from the medical record.

Question 2

Is O26.839 an HCC code?

Accepted Answer

No. O26.839 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 O26.839 billable?

Accepted Answer

Yes. O26.839 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. O26.839 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 O26.839?

Accepted Answer

O26.839 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 O26.839 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 O26.839?

Accepted Answer

Use only when trimester cannot be determined from the medical record Query provider if trimester information is available elsewhere in documentation

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O26.839

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O26.839 ICD-10-CM Code: Pregnancy related renal disease, unspecified trimester

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O26.839

Is O26.839 an HCC code?

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Work O26.839 in HCC Buddy