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ICD-10-CM 2027 diagnosis code

H20.1Chronic iridocyclitis

Not billable — use a more specific code

H20.1 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

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 H20.1

H20.1 is the ICD-10-CM diagnosis code for chronic 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 4 subcodes must be used instead.

Within H20 (iridocyclitis), H20.1 is specifically for chronic iridocyclitis. Related codes cover acute and subacute iridocyclitis (H20.0), 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: H20.10 (unspecified eye), H20.11 (right eye), H20.12 (left eye) and H20.13 (bilateral).

The conditions in its Excludes2 note aren't part of H20.1, but may be coded alongside it if the patient has both: posterior cyclitis (H30.2-).

Use an additional code for any associated cataract (H26.21-).

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 H20.1

Coding notes

Excludes2Not included here — may be reported together if both conditions exist
Use additional codeAdd a secondary code to fully describe the condition
  • code for any associated cataract (H26.21-)

Notes that apply from higher levels

Instructions written at a parent level also apply to H20.1.

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 H20.1.

Codes whose notes reference H20.1

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 H20.1

Is H20.1 billable?

No. H20.1 is a header code. Report one of its more specific subcodes instead.