H21.26Iris atrophy (essential) (progressive)

H21.26 is the ICD-10-CM diagnosis code for iris atrophy (essential) (progressive). It belongs to category H21 (other disorders of iris and ciliary body), 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 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.