| H21.21 | Degeneration of chamber angle | NON-BILLABLE CODE |
| H21.211 | Degeneration of chamber angle, right eye | BILLABLE CODE |
| H21.212 | Degeneration of chamber angle, left eye | BILLABLE CODE |
| H21.213 | Degeneration of chamber angle, bilateral | BILLABLE CODE |
| H21.219 | Degeneration of chamber angle, unspecified eye | BILLABLE CODE |
| H21.22 | Degeneration of ciliary body | NON-BILLABLE CODE |
| H21.221 | Degeneration of ciliary body, right eye | BILLABLE CODE |
| H21.222 | Degeneration of ciliary body, left eye | BILLABLE CODE |
| H21.223 | Degeneration of ciliary body, bilateral | BILLABLE CODE |
| H21.229 | Degeneration of ciliary body, unspecified eye | BILLABLE CODE |
| H21.23 | Degeneration of iris (pigmentary) | NON-BILLABLE CODE |
| H21.231 | Degeneration of iris (pigmentary), right eye | BILLABLE CODE |
| H21.232 | Degeneration of iris (pigmentary), left eye | BILLABLE CODE |
| H21.233 | Degeneration of iris (pigmentary), bilateral | BILLABLE CODE |
| H21.239 | Degeneration of iris (pigmentary), unspecified eye | BILLABLE CODE |
| H21.24 | Degeneration of pupillary margin | NON-BILLABLE CODE |
| H21.241 | Degeneration of pupillary margin, right eye | BILLABLE CODE |
| H21.242 | Degeneration of pupillary margin, left eye | BILLABLE CODE |
| H21.243 | Degeneration of pupillary margin, bilateral | BILLABLE CODE |
| H21.249 | Degeneration of pupillary margin, unspecified eye | BILLABLE CODE |
| H21.25 | Iridoschisis | NON-BILLABLE CODE |
| H21.251 | Iridoschisis, right eye | BILLABLE CODE |
| H21.252 | Iridoschisis, left eye | BILLABLE CODE |
| H21.253 | Iridoschisis, bilateral | BILLABLE CODE |
| H21.259 | Iridoschisis, unspecified eye | BILLABLE CODE |
| H21.26 | Iris atrophy (essential) (progressive) | NON-BILLABLE CODE |
| H21.261 | Iris atrophy (essential) (progressive), right eye | BILLABLE CODE |
| H21.262 | Iris atrophy (essential) (progressive), left eye | BILLABLE CODE |
| H21.263 | Iris atrophy (essential) (progressive), bilateral | BILLABLE CODE |
| H21.269 | Iris atrophy (essential) (progressive), unspecified eye | BILLABLE CODE |
| H21.27 | Miotic pupillary cyst | NON-BILLABLE CODE |
| H21.271 | Miotic pupillary cyst, right eye | BILLABLE CODE |
| H21.272 | Miotic pupillary cyst, left eye | BILLABLE CODE |
| H21.273 | Miotic pupillary cyst, bilateral | BILLABLE CODE |
| H21.279 | Miotic pupillary cyst, unspecified eye | BILLABLE CODE |
| H21.29 | Other iris atrophy | BILLABLE CODE |
