Question 1

What is ICD-10 code H59.099?

Accepted Answer

H59.099 is the ICD-10-CM diagnosis code for other disorders of unspecified eye following cataract surgery. Various complications or problems in an unspecified eye that occur after cataract surgery, not classified elsewhere. H59.099 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering intraoperative and postprocedural complications and disorders of eye and adnexa, not elsewhere classified (h59).

H59.099 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.

Avoid using this code; query the provider to determine which eye is affected (right, left, or bilateral).

Question 2

Is H59.099 an HCC code?

Accepted Answer

No. H59.099 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 H59.099 billable?

Accepted Answer

Yes. H59.099 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. H59.099 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 H59.099?

Accepted Answer

H59.099 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 H59.099 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 H59.099?

Accepted Answer

Avoid using this code; query the provider to determine which eye is affected (right, left, or bilateral) This code should only be used when laterality truly cannot be determined from available documentation

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H59.099

Is H59.099 an HCC code?

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H59.099 ICD-10-CM Code: Other disorders of unspecified eye following cataract surgery

HCC Buddy Code Card

H59.099

Is H59.099 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open H59.099 in the Interactive Encoder