Question 1

What is ICD-10 code O99.719?

Accepted Answer

O99.719 is the ICD-10-CM diagnosis code for diseases of the skin and subcutaneous tissue complicating pregnancy, unspecified trimester. A skin or subcutaneous tissue disease occurring during pregnancy when the specific trimester is not documented or specified. O99.719 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).

O99.719 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 documentation; query provider for clarification when possible.

Question 2

Is O99.719 an HCC code?

Accepted Answer

No. O99.719 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 O99.719 billable?

Accepted Answer

Yes. O99.719 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. O99.719 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

Which HCC does O99.719 map to under V28?

Accepted Answer

O99.719 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

Question 5

What does O99.719 pay in RAF?

Accepted Answer

O99.719 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

Question 6

What is the V28 vs V24 difference for O99.719?

Accepted Answer

O99.719 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 O99.719 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 7

What documentation supports O99.719?

Accepted Answer

Use only when trimester cannot be determined from documentation; query provider for clarification when possible Must include a secondary diagnosis code for the specific skin condition O99.719 is not a CMS-HCC payment code, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

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O99.719

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O99.719 ICD-10-CM Code: Diseases of the skin and subcutaneous tissue complicating pregnancy, unspecified trimester

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O99.719

Is O99.719 an HCC code?

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What This Code Means

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