Question 1

What is ICD-10 code H10.529?

Accepted Answer

H10.529 is the ICD-10-CM diagnosis code for angular blepharoconjunctivitis, unspecified eye. Inflammation of the eyelid and conjunctiva (the clear membrane covering the white of the eye) in a specific angular pattern, affecting an unspecified eye. H10.529 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).

H10.529 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.

Use this code only when the specific eye (right, left, or bilateral) is not documented; query the provider if laterality is not specified.

Question 2

Is H10.529 an HCC code?

Accepted Answer

No. H10.529 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 H10.529 billable?

Accepted Answer

Yes. H10.529 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. H10.529 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 H10.529?

Accepted Answer

H10.529 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 H10.529 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 H10.529?

Accepted Answer

Use this code only when the specific eye (right, left, or bilateral) is not documented; query the provider if laterality is not specified Angular blepharoconjunctivitis typically occurs at the angles of the eyelid fissure and may be associated with specific irritants

HCC Buddy Code Card

H10.529

Is H10.529 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work H10.529 in HCC Buddy

H10.529 ICD-10-CM Code: Angular blepharoconjunctivitis, unspecified eye

HCC Buddy Code Card

H10.529

Is H10.529 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Work H10.529 in HCC Buddy