Question 1

What is ICD-10 code H16.403?

Accepted Answer

H16.403 is the ICD-10-CM diagnosis code for unspecified corneal neovascularization, bilateral. Abnormal new blood vessel growth in the cornea affecting both eyes without a specified underlying cause. H16.403 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).

H16.403 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 corneal neovascularization is explicitly documented.

Question 2

Is H16.403 an HCC code?

Accepted Answer

No. H16.403 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 H16.403 billable?

Accepted Answer

Yes. H16.403 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. H16.403 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 H16.403?

Accepted Answer

H16.403 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 H16.403 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 H16.403?

Accepted Answer

Verify bilateral corneal neovascularization is explicitly documented Consider if systemic conditions (diabetes, autoimmune disease) are present that may explain the bilateral presentation

HCC Buddy Code Card

H16.403

Is H16.403 an HCC code?

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Open H16.403 in the Interactive Encoder

H16.403 ICD-10-CM Code: Unspecified corneal neovascularization, bilateral

HCC Buddy Code Card

H16.403

Is H16.403 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open H16.403 in the Interactive Encoder