H21.1X1 (Other vascular disorders of iris and ciliary body, right eye) compared with H21.1X9 (Other vascular disorders of iris and ciliary body, unspecified eye), from the official CMS tabular data. H21.1X1 and H21.1X9 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. H21.1X1 and H21.1X9 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.
| H21.1X1Other vascular disorders of iris and ciliary body, right eye | H21.1X9Other vascular disorders of iris and ciliary body, 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 | Other vascular disorders of iris and ciliary body, right eye is a billable ICD-10-CM diagnosis code (H21.1X1). | Other vascular disorders of iris and ciliary body, unspecified eye is a billable ICD-10-CM diagnosis code (H21.1X9). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources