ICD-10-CM 2027
ICD-10 code for cyclitis
From the official ICD-10-CM alphabetic index entry “Cyclitis”. Page updated September 29, 2026.
About coding cyclitis
The ICD-10-CM code for cyclitis is H20.9 (Unspecified iridocyclitis). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H20.9.
Within H20, choose H20.9 (Unspecified iridocyclitis) only when documentation doesn't support a more specific option: acute and subacute iridocyclitis (H20.0), chronic iridocyclitis (H20.1), Lens-induced iridocyclitis (H20.2) and other iridocyclitis (H20.8).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific cyclitis codes (official index)
Common questions about cyclitis ICD-10 codes
What is the ICD-10 code for cyclitis?
- H20.9 — Unspecified iridocyclitis. More specific codes apply when the documentation supports them: H20.81, H30.2.
What is the ICD-10 code for fuchs' heterochromic cyclitis?
- H20.81 — Fuchs' heterochromic cyclitis (header code; choose a more specific subcode).
What is the ICD-10 code for posterior cyclitis?
- H30.2 — Posterior cyclitis (header code; choose a more specific subcode).
Is H20.9 billable?
- Yes. H20.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H20.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H20.9 as a principal diagnosis.
Is H20.9 a CC or MCC?
- H20.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.