Question 1

What is ICD-10 code O24.410?

Accepted Answer

O24.410 is the ICD-10-CM diagnosis code for gestational diabetes mellitus in pregnancy, diet controlled. A pregnant woman develops diabetes during pregnancy (gestational diabetes) that is controlled through diet alone without medication. O24.410 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).

O24.410 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.

Gestational diabetes codes are trimester-specific; ensure the correct trimester is documented or use the 5th character appropriately.

Question 2

Is O24.410 an HCC code?

Accepted Answer

No. O24.410 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 O24.410 billable?

Accepted Answer

Yes. O24.410 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. O24.410 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 O24.410?

Accepted Answer

O24.410 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 model rewards O24.410 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting O24.410?

Accepted Answer

Gestational diabetes codes are trimester-specific; ensure the correct trimester is documented or use the 5th character appropriately Diet control means no insulin or oral medications are being used; if medications are added later, update the code

O24.410

Is O24.410 an HCC code?

What This Code Means

Coding Tips

Code Hierarchy

Open O24.410 in the Interactive Encoder