Question 1

What is ICD-10 code H10.513?

Accepted Answer

H10.513 is the ICD-10-CM diagnosis code for ligneous conjunctivitis, bilateral. A rare type of eyelid and conjunctival inflammation characterized by woody, fibrous tissue formation affecting both eyes. H10.513 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of conjunctiva (h10-h11).

H10.513 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.

Ligneous conjunctivitis is a specific, rare condition; ensure documentation supports this diagnosis before coding.

Question 2

Is H10.513 an HCC code?

Accepted Answer

No. H10.513 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 H10.513 billable?

Accepted Answer

Yes. H10.513 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. H10.513 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 H10.513?

Accepted Answer

H10.513 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 H10.513 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 H10.513?

Accepted Answer

Ligneous conjunctivitis is a specific, rare condition; ensure documentation supports this diagnosis before coding Do not use additional laterality codes when bilateral is already specified in this code

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H10.513

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H10.513 ICD-10-CM Code: Ligneous conjunctivitis, bilateral

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H10.513

Is H10.513 an HCC code?

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