Question 1

What is ICD-10 code H11.059?

Accepted Answer

H11.059 is the ICD-10-CM diagnosis code for peripheral pterygium, progressive, unspecified eye. A progressive growth of tissue on the white part of the eye that extends from the corner toward the pupil and is getting worse, but the specific eye is not documented. H11.059 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).

H11.059 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 only when laterality cannot be determined from documentation.

Question 2

Is H11.059 an HCC code?

Accepted Answer

No. H11.059 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 H11.059 billable?

Accepted Answer

Yes. H11.059 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. H11.059 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 H11.059?

Accepted Answer

H11.059 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 H11.059 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 H11.059?

Accepted Answer

Use only when laterality cannot be determined from documentation Query provider if possible to determine right, left, or bilateral involvement

HCC Buddy Code Card

H11.059

Is H11.059 an HCC code?

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Open H11.059 in the Interactive Encoder

H11.059 ICD-10-CM Code: Peripheral pterygium, progressive, unspecified eye

HCC Buddy Code Card

H11.059

Is H11.059 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open H11.059 in the Interactive Encoder