H21.231 (Degeneration of iris (pigmentary), right eye) compared with H21.232 (Degeneration of iris (pigmentary), left eye), from the official CMS tabular data. H21.231 and H21.232 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. H21.231 and H21.232 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| H21.231Degeneration of iris (pigmentary), right eye | H21.232Degeneration of iris (pigmentary), left eye | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | H00-H59 — Diseases of the Eye and Adnexa (H00-H59) | H00-H59 — Diseases of the Eye and Adnexa (H00-H59) |
| Definition | Degeneration of iris (pigmentary), right eye is a billable ICD-10-CM diagnosis code (H21.231). | Degeneration of iris (pigmentary), left eye is a billable ICD-10-CM diagnosis code (H21.232). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources