ICD-10-CM 2027
ICD-10 code for iris atrophy
From the official ICD-10-CM alphabetic index entry “Atrophy, atrophic (of) › iris (essential) (progressive)”. Page updated September 29, 2026.
About coding iris atrophy
The ICD-10-CM code for iris atrophy is H21.26 (Iris atrophy (essential) (progressive)). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on H21.26.
Within H21.2 (degeneration of iris and ciliary body), H21.26 is specifically for iris atrophy (essential) (progressive). Related codes cover degeneration of chamber angle (H21.21), degeneration of ciliary body (H21.22), degeneration of iris (pigmentary) (H21.23), degeneration of pupillary margin (H21.24), Iridoschisis (H21.25), Miotic pupillary cyst (H21.27) and other iris atrophy (H21.29).
To report this condition, pick the subcode that matches the documentation: H21.261 (right eye), H21.262 (left eye), H21.263 (bilateral) and H21.269 (unspecified eye).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific iris atrophy codes (official index)
- specified NEC H21.29 — Other iris atrophy
Common questions about iris atrophy ICD-10 codes
What is the ICD-10 code for iris atrophy?
- H21.26 — Iris atrophy (essential) (progressive) (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: H21.29.
Is H21.26 billable?
- No. H21.26 is a header code. Report one of its more specific subcodes instead.