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ICD-10-CM 2027 diagnosis code

H21Other disorders of iris and ciliary body

Not billable — use a more specific code

H21 is a header code, so it can't be reported by itself. Choose one of the 8 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 H21

H21 is the ICD-10-CM diagnosis code for other disorders of iris and ciliary body. It belongs to 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 8 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H21.0 (Hyphema), H21.1 (body), H21.2 (body), H21.3 (chamber), H21.4 (membranes), H21.5 (body), H21.8 (body) and H21.9 (body).

The conditions in its Excludes2 note aren't part of H21, but may be coded alongside it if the patient has both: sympathetic uveitis (H44.1-).

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 H21

Coding notes

Excludes2Not included here — may be reported together if both conditions exist

Notes that apply from higher levels

Instructions written at a parent level also apply to H21.

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

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 H21

Is H21 billable?

No. H21 is a header code. Report one of its more specific subcodes instead.