H31.121 (Diffuse secondary atrophy of choroid, right eye) compared with H31.129 (Diffuse secondary atrophy of choroid, unspecified eye), from the official CMS tabular data. H31.121 and H31.129 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. H31.121 and H31.129 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.
| H31.121Diffuse secondary atrophy of choroid, right eye | H31.129Diffuse secondary atrophy of choroid, unspecified 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 | Diffuse secondary atrophy of choroid, right eye is a billable ICD-10-CM diagnosis code (H31.121). | Diffuse secondary atrophy of choroid, unspecified eye is a billable ICD-10-CM diagnosis code (H31.129). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources