Question 1

What is ICD-10 code F89?

Accepted Answer

F89 is the ICD-10-CM diagnosis code for unspecified disorder of psychological development. A disorder of psychological development that cannot be more specifically identified or classified. F89 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering pervasive and specific developmental disorders (f80-f89).

F89 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 the most nonspecific code for developmental disorders; use only when no other F80-F88 code applies.

Question 2

Is F89 an HCC code?

Accepted Answer

No. F89 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 F89 billable?

Accepted Answer

Yes. F89 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. F89 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 F89?

Accepted Answer

F89 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 F89 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 F89?

Accepted Answer

This is the most nonspecific code for developmental disorders; use only when no other F80-F88 code applies Review the medical record thoroughly to determine if a more specific developmental disorder code is appropriate

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F89

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F89 ICD-10-CM Code: Unspecified disorder of psychological development

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F89

Is F89 an HCC code?

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What This Code Means

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