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ICD-10-CM 2027 diagnosis code

H20.0Acute and subacute iridocyclitis

Not billable — use a more specific code

H20.0 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Looking up by condition? See ICD-10 code for Acute iridocyclitis.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H20.0

H20.0 is the ICD-10-CM diagnosis code for acute and subacute iridocyclitis. It belongs to category H20 (iridocyclitis), block H15-H22 (disorders of sclera, cornea, iris and ciliary body) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under H20.0

Coding notes

Applicable toConditions and synonyms classified to this code
  • Acute anterior uveitis
  • Acute cyclitis
  • Acute iritis
  • Subacute anterior uveitis
  • Subacute cyclitis
  • Subacute iritis
Excludes1Not coded here — never report together with this code
  • 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)

Notes that apply from higher levels

Instructions written at a parent level also apply to H20.0.

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to H20.0.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about H20.0

Is H20.0 billable?

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