Question 1

What is ICD-10 code H16.413?

Accepted Answer

H16.413 is the ICD-10-CM diagnosis code for ghost vessels (corneal), bilateral. Remnants of blood vessels in the cornea of both eyes that appear as faint lines or shadows, typically from previous inflammation or injury. H16.413 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).

H16.413 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.

Confirm bilateral ghost vessels are documented before assigning this code.

Question 2

Is H16.413 an HCC code?

Accepted Answer

No. H16.413 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 H16.413 billable?

Accepted Answer

Yes. H16.413 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. H16.413 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 H16.413?

Accepted Answer

H16.413 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 H16.413 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 H16.413?

Accepted Answer

Confirm bilateral ghost vessels are documented before assigning this code Consider the underlying cause of the previous corneal inflammation that led to ghost vessel formation

HCC Buddy Code Card

H16.413

Is H16.413 an HCC code?

What This Code Means

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Code Hierarchy

Open H16.413 in the Interactive Encoder

H16.413 ICD-10-CM Code: Ghost vessels (corneal), bilateral

HCC Buddy Code Card

H16.413

Is H16.413 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open H16.413 in the Interactive Encoder