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ICD-10-CM 2027

ICD-10 code for acute iridocyclitis

H20.0

Acute and subacute iridocyclitis

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Iridocyclitis › acute”. Page updated September 29, 2026.

About coding acute iridocyclitis

The ICD-10-CM code for acute iridocyclitis is H20.0 (Acute and subacute iridocyclitis). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H20.0.

Within H20 (iridocyclitis), H20.0 is specifically for acute and subacute iridocyclitis. Related codes cover chronic iridocyclitis (H20.1), Lens-induced iridocyclitis (H20.2), other iridocyclitis (H20.8) and unspecified iridocyclitis (H20.9).

To report this condition, pick the subcode that matches the documentation: H20.00 (iridocyclitis), H20.01 (iridocyclitis), H20.02 (iridocyclitis), H20.03 (iridocyclitis), H20.04 (iridocyclitis) and H20.05 (hypopyon).

Don't report H20.0 together with the conditions in its Excludes1 note: 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) and 7 more.

More specific acute iridocyclitis codes (official index)

  • 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

Don't confuse with (Excludes1 for H20.0)

  • 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)

Common questions about acute iridocyclitis ICD-10 codes

What is the ICD-10 code for acute iridocyclitis?

H20.0 — Acute and subacute iridocyclitis (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: H20.05, H20.01, H20.02, H20.04 and others below.

What is the ICD-10 code for hypopyon acute iridocyclitis?

H20.05 — Hypopyon (header code; choose a more specific subcode).

What is the ICD-10 code for primary acute iridocyclitis?

H20.01 — Primary iridocyclitis (header code; choose a more specific subcode).

What is the ICD-10 code for recurrent acute iridocyclitis?

H20.02 — Recurrent acute iridocyclitis (header code; choose a more specific subcode).

What is the ICD-10 code for secondary acute iridocyclitis?

H20.04 — Secondary noninfectious iridocyclitis (header code; choose a more specific subcode).

Is H20.0 billable?

No. H20.0 is a header code. Report one of its more specific subcodes instead.