Question 1

What is ICD-10 code H16.443?

Accepted Answer

H16.443 is the ICD-10-CM diagnosis code for deep vascularization of cornea, bilateral. New blood vessel growth extending into the deeper layers of the cornea in both eyes, typically from chronic inflammation or disease. H16.443 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of sclera, cornea, iris and ciliary body (h15-h22).

H16.443 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.

Verify bilateral deep vascularization is explicitly documented before coding.

Question 2

Is H16.443 an HCC code?

Accepted Answer

No. H16.443 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 H16.443 billable?

Accepted Answer

Yes. H16.443 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. H16.443 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 H16.443 map to under V28?

Accepted Answer

H16.443 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 H16.443 pay in RAF?

Accepted Answer

H16.443 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 H16.443?

Accepted Answer

H16.443 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 H16.443 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 H16.443?

Accepted Answer

Verify bilateral deep vascularization is explicitly documented before coding Deep vascularization in both eyes may indicate systemic or severe ocular disease requiring investigation H16.443 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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H16.443

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H16.443 ICD-10-CM Code: Deep vascularization of cornea, bilateral

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H16.443

Is H16.443 an HCC code?

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