Question 1

What is ICD-10 code H18.033?

Accepted Answer

H18.033 is the ICD-10-CM diagnosis code for corneal deposits in metabolic disorders, bilateral. Deposits on the front surface of both corneas caused by metabolic disorders such as diabetes or other systemic conditions affecting mineral or protein metabolism. H18.033 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of sclera, cornea, iris and ciliary body (h15-h22).

H18.033 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.

Bilateral metabolic corneal deposits typically indicate a systemic metabolic condition requiring investigation.

Question 2

Is H18.033 an HCC code?

Accepted Answer

No. H18.033 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 H18.033 billable?

Accepted Answer

Yes. H18.033 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. H18.033 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 H18.033?

Accepted Answer

H18.033 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 community model rewards H18.033 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

Question 5

What should coders know when reporting H18.033?

Accepted Answer

Bilateral metabolic corneal deposits typically indicate a systemic metabolic condition requiring investigation Ensure the underlying metabolic disorder is coded separately and documented clearly

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H18.033

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H18.033 ICD-10-CM Code: Corneal deposits in metabolic disorders, bilateral

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H18.033

Is H18.033 an HCC code?

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