ICD-10-CM 2027
ICD-10 code for iridocyclitis
From the official ICD-10-CM alphabetic index entry “Iridocyclitis”. Page updated September 29, 2026.
About coding iridocyclitis
The ICD-10-CM code for iridocyclitis is H20.9 (Unspecified iridocyclitis). The official index lists 24 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 iridocyclitis codes (official index)
- acute H20.0 — Acute and subacute iridocyclitis
- hypopyon H20.05 — Hypopyon
- primary H20.01 — Primary iridocyclitis
- recurrent H20.02 — Recurrent acute iridocyclitis
- secondary (noninfectious) H20.04 — Secondary noninfectious iridocyclitis
- infectious H20.03 — Secondary infectious iridocyclitis
- chronic H20.1 — Chronic iridocyclitis
- due to allergy
- endogenous
- Fuchs'
- gonococcal A54.32 — Gonococcal iridocyclitis
- granulomatous
- herpes, herpetic (simplex) B00.51 — Herpesviral iridocyclitis
- zoster B02.32 — Zoster iridocyclitis
- hypopyon
- in (due to)
- ankylosing spondylitis M45.9 — Ankylosing spondylitis of unspecified sites in spine
- gonococcal infection A54.32 — Gonococcal iridocyclitis
- herpes (simplex) virus B00.51 — Herpesviral iridocyclitis
- zoster B02.32 — Zoster iridocyclitis
- infectious disease NOS B99 — Other and unspecified infectious diseases
- parasitic disease NOS B89 — Unspecified parasitic disease
- sarcoidosis D86.83 — Sarcoid iridocyclitis
- syphilis A51.43 — Secondary syphilitic oculopathy
- tuberculosis A18.54 — Tuberculous iridocyclitis
- zoster B02.32 — Zoster iridocyclitis
- lens-induced H20.2 — Lens-induced iridocyclitis
- nongranulomatous
- recurrent
- rheumatic
- subacute
- sympathetic
- syphilitic (secondary) A51.43 — Secondary syphilitic oculopathy
- tuberculous (chronic) A18.54 — Tuberculous iridocyclitis
- Vogt-Koyanagi H20.82 — Vogt-Koyanagi syndrome
Common questions about iridocyclitis ICD-10 codes
What is the ICD-10 code for iridocyclitis?
- H20.9 — Unspecified iridocyclitis. More specific codes apply when the documentation supports them: H20.0, H20.05, H20.01, H20.02 and others below.
What is the ICD-10 code for acute iridocyclitis?
- H20.0 — Acute and subacute iridocyclitis (header code; choose a more specific subcode).
What is the ICD-10 code for chronic iridocyclitis?
- H20.1 — Chronic iridocyclitis (header code; choose a more specific subcode).
What is the ICD-10 code for gonococcal iridocyclitis?
- A54.32 — Gonococcal iridocyclitis.
What is the ICD-10 code for lens-induced iridocyclitis?
- H20.2 — Lens-induced iridocyclitis (header code; choose a more specific subcode).
What is the ICD-10 code for syphilitic iridocyclitis?
- A51.43 — Secondary syphilitic oculopathy.
What is the ICD-10 code for tuberculous iridocyclitis?
- A18.54 — Tuberculous iridocyclitis.
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.