H20.019 Primary iridocyclitis, unspecified eye

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from H20.0 Acute and subacute iridocyclitis

Applicable to

• Acute anterior uveitis
• Acute cyclitis
• Acute iritis
• Subacute anterior uveitis
• Subacute cyclitis
• Subacute iritis

Excludes1 (never code together)

• iridocyclitis, iritis, uveitis (due to) (in) diabetes mellitus (E08-E13 with .39)
• iridocyclitis, iritis, uveitis (due to) (in) diphtheria (A36.89)
• iridocyclitis, iritis, uveitis (due to) (in) gonococcal (A54.32)
• iridocyclitis, iritis, uveitis (due to) (in) herpes (simplex) (B00.51)
• iridocyclitis, iritis, uveitis (due to) (in) herpes zoster (B02.32)
• iridocyclitis, iritis, uveitis (due to) (in) late congenital syphilis (A50.39)
• iridocyclitis, iritis, uveitis (due to) (in) late syphilis (A52.71)
• iridocyclitis, iritis, uveitis (due to) (in) sarcoidosis (D86.83)
• iridocyclitis, iritis, uveitis (due to) (in) syphilis (A51.43)
• iridocyclitis, iritis, uveitis (due to) (in) toxoplasmosis (B58.09)
• iridocyclitis, iritis, uveitis (due to) (in) tuberculosis (A18.54)

MS-DRG index

Defines the logic of DRG(s) 124-125 in MDC 02.

Approximate ICD-9-CM (GEMs)

• 364.01 Primary iridocyclitis (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Nearby codes

• H20.00 Unspecified acute and subacute iridocyclitis
• H20.01 Primary iridocyclitis
• H20.011 Primary iridocyclitis, right eye
• H20.012 Primary iridocyclitis, left eye
• H20.013 Primary iridocyclitis, bilateral
• H20.019 Primary iridocyclitis, unspecified eye (this code)
• H20.02 Recurrent acute iridocyclitis
• H20.021 Recurrent acute iridocyclitis, right eye
• H20.022 Recurrent acute iridocyclitis, left eye
• H20.023 Recurrent acute iridocyclitis, bilateral
• H20.029 Recurrent acute iridocyclitis, unspecified eye