H20.021 ICD-10-CM Code: Recurrent acute iridocyclitis, right eye
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FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Disorders of sclera, cornea, iris and ciliary body (H15-H22)
H20.021
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceRecurrent acute iridocyclitis, right eye
This code describes inflammation of the iris and ciliary body (the structures inside the eye that control focus and produce fluid) that keeps coming back in the right eye. The patient experiences repeated episodes of acute (sudden) eye inflammation rather than a continuous chronic condition.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
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Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for H20.021 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H20.021 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H20.021 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H20.021 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H20.021 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H20.021 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H20.021 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is H20.021 an HCC code?
No. H20.021 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
H20.021 is the ICD-10-CM diagnosis code for recurrent acute iridocyclitis, right eye. This code describes inflammation of the iris and ciliary body (the structures inside the eye that control focus and produce fluid) that keeps coming back in the right eye. The patient experiences repeated episodes of acute (sudden) eye inflammation rather than a continuous chronic condition. H20.021 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).
H20.021 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.
Verify laterality is documented as right eye only; if bilateral or left eye, use different codes (H20.022 for left, H20.023 for bilateral).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for H20.021 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify laterality is documented as right eye only; if bilateral or left eye, use different codes (H20.022 for left, H20.023 for bilateral)
- •Confirm the inflammation is recurrent (multiple episodes) and acute in nature; if it's chronic or first occurrence, use different H20 codes such as H20.001 (acute iridocyclitis, right eye) or H20.031 (chronic iridocyclitis, right eye)