Skip to content
Dx

ICD-10-CM 2027

ICD-10 code for chamber angle degeneration

H21.21

Degeneration of chamber angle

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Degeneration, degenerative › chamber angle”. Page updated September 29, 2026.

About coding chamber angle degeneration

The ICD-10-CM code for chamber angle degeneration is H21.21 (Degeneration of chamber angle).

Within H21.2 (degeneration of iris and ciliary body), H21.21 is specifically for degeneration of chamber angle. Related codes cover degeneration of ciliary body (H21.22), degeneration of iris (pigmentary) (H21.23), degeneration of pupillary margin (H21.24), Iridoschisis (H21.25), iris atrophy (essential) (progressive) (H21.26), Miotic pupillary cyst (H21.27) and other iris atrophy (H21.29).

To report this condition, pick the subcode that matches the documentation: H21.211 (right eye), H21.212 (left eye), H21.213 (bilateral) and H21.219 (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.

Common questions about chamber angle degeneration ICD-10 codes

What is the ICD-10 code for chamber angle degeneration?

H21.21 — Degeneration of chamber angle (a header code; report a more specific subcode).

Is H21.21 billable?

No. H21.21 is a header code. Report one of its more specific subcodes instead.