Question 1

What is ICD-10 code H33.122?

Accepted Answer

H33.122 is the ICD-10-CM diagnosis code for parasitic cyst of retina, left eye. A cyst in the retina of the left eye caused by a parasitic infection, such as toxoplasmosis or cysticercosis. H33.122 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).

H33.122 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.

Code the underlying parasitic infection in addition to this ocular manifestation code.

Question 2

Is H33.122 an HCC code?

Accepted Answer

No. H33.122 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 H33.122 billable?

Accepted Answer

Yes. H33.122 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. H33.122 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 H33.122?

Accepted Answer

H33.122 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 H33.122 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 H33.122?

Accepted Answer

Code the underlying parasitic infection in addition to this ocular manifestation code Confirm left eye laterality is documented before assigning this code

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H33.122

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H33.122 ICD-10-CM Code: Parasitic cyst of retina, left eye

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H33.122

Is H33.122 an HCC code?

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What This Code Means

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Work H33.122 in HCC Buddy