Question 1

What is ICD-10 code H20.00?

Accepted Answer

H20.00 is the ICD-10-CM diagnosis code for unspecified acute and subacute iridocyclitis. Inflammation of the iris and ciliary body (structures inside the eye) that develops suddenly or over a short period, but the specific cause is not identified. H20.00 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).

H20.00 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

This code indicates acute or subacute onset; if chronic iridocyclitis is documented, use H20.1 codes instead.

Question 2

Is H20.00 an HCC code?

Accepted Answer

H20.00 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is H20.00 billable?

Accepted Answer

Yes. H20.00 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. H20.00 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

Which HCC does H20.00 map to under V28?

Accepted Answer

H20.00 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for H20.00?

Accepted Answer

H20.00 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

Question 6

What is the V28 vs V24 difference for H20.00?

Accepted Answer

H20.00 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

Question 7

What documentation supports H20.00?

Accepted Answer

This code indicates acute or subacute onset; if chronic iridocyclitis is documented, use H20.1 codes instead Determine if a primary cause (like trauma, infection, or autoimmune disease) can be identified to assign a more specific code H20.00 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

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H20.00

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H20.00 ICD-10-CM Code: Unspecified acute and subacute iridocyclitis

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H20.00

Is H20.00 an HCC code?

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What This Code Means

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Work H20.00 in HCC Buddy