H21.341 (Primary cyst of pars plana, right eye) compared with H21.342 (Primary cyst of pars plana, left eye), from the official CMS tabular data. H21.341 and H21.342 code the same condition on opposite sides. MedCoder-derived
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. H21.341 and H21.342 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.
| H21.341Primary cyst of pars plana, right eye | H21.342Primary cyst of pars plana, left eye | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | H00-H59 — Diseases of the eye and adnexa | H00-H59 — Diseases of the eye and adnexa |
| Definition | Primary cyst of pars plana, right eye is a billable ICD-10-CM diagnosis code (H21.341). | Primary cyst of pars plana, left eye is a billable ICD-10-CM diagnosis code (H21.342). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources