Question 1

What is ICD-10 code H33.193?

Accepted Answer

H33.193 is the ICD-10-CM diagnosis code for other retinoschisis and retinal cysts, bilateral. A condition where the retina splits into layers or develops fluid-filled pockets affecting both eyes. H33.193 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of choroid and retina (h30-h36).

H33.193 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 condition is documented as bilateral; do not use for unilateral conditions.

Question 2

Is H33.193 an HCC code?

Accepted Answer

No. H33.193 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 H33.193 billable?

Accepted Answer

Yes. H33.193 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. H33.193 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 H33.193?

Accepted Answer

H33.193 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 H33.193 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 H33.193?

Accepted Answer

Use this code only when the condition is documented as bilateral; do not use for unilateral conditions Ensure documentation specifies involvement of both eyes to justify bilateral coding

HCC Buddy Code Card

H33.193

Is H33.193 an HCC code?

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Open H33.193 in the Interactive Encoder

H33.193 ICD-10-CM Code: Other retinoschisis and retinal cysts, bilateral

HCC Buddy Code Card

H33.193

Is H33.193 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open H33.193 in the Interactive Encoder