Question 1

What is ICD-10 code H44.431?

Accepted Answer

H44.431 is the ICD-10-CM diagnosis code for hypotony of eye due to other ocular disorders, right eye. Abnormally low pressure in the right eye caused by other eye disorders or conditions not related to fistulas or flat anterior chamber. H44.431 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of vitreous body and globe (h43-h44).

H44.431 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 catch-all code for hypotony due to causes other than fistula or flat anterior chamber.

Question 2

Is H44.431 an HCC code?

Accepted Answer

No. H44.431 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 H44.431 billable?

Accepted Answer

Yes. H44.431 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. H44.431 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 H44.431?

Accepted Answer

H44.431 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 H44.431 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 H44.431?

Accepted Answer

This is a catch-all code for hypotony due to causes other than fistula or flat anterior chamber Document the underlying ocular disorder causing the hypotony for clinical clarity

HCC Buddy Code Card

H44.431

Is H44.431 an HCC code?

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H44.431 ICD-10-CM Code: Hypotony of eye due to other ocular disorders, right eye

HCC Buddy Code Card

H44.431

Is H44.431 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open H44.431 in the Interactive Encoder