Question 1

What is ICD-10 code H00.015?

Accepted Answer

H00.015 is the ICD-10-CM diagnosis code for hordeolum externum left lower eyelid. A small, painful bump on the outer edge of the left lower eyelid caused by a bacterial infection of an eyelash follicle. H00.015 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of eyelid, lacrimal system and orbit (h00-h05).

H00.015 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 the location is the left eye and lower eyelid to ensure correct code assignment.

Question 2

Is H00.015 an HCC code?

Accepted Answer

No. H00.015 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 H00.015 billable?

Accepted Answer

Yes. H00.015 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. H00.015 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 H00.015?

Accepted Answer

H00.015 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 H00.015 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 H00.015?

Accepted Answer

Verify the location is the left eye and lower eyelid to ensure correct code assignment Note any treatment provided (warm compresses, antibiotics, or drainage) in the medical record

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H00.015

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H00.015 ICD-10-CM Code: Hordeolum externum left lower eyelid

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H00.015

Is H00.015 an HCC code?

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What This Code Means

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Child Codes

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Work H00.015 in HCC Buddy