H10.421 (Simple chronic conjunctivitis, right eye) compared with H10.422 (Simple chronic conjunctivitis, left eye), from the official CMS tabular data. H10.421 and H10.422 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. H10.421 and H10.422 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.
| H10.421Simple chronic conjunctivitis, right eye | H10.422Simple chronic conjunctivitis, 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 | Simple chronic conjunctivitis, right eye is a billable ICD-10-CM diagnosis code (H10.421). | Simple chronic conjunctivitis, left eye is a billable ICD-10-CM diagnosis code (H10.422). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources