H16.321 (Diffuse interstitial keratitis, right eye) compared with H16.329 (Diffuse interstitial keratitis, unspecified eye), from the official CMS tabular data. H16.321 and H16.329 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. H16.321 and H16.329 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.
| H16.321Diffuse interstitial keratitis, right eye | H16.329Diffuse interstitial keratitis, 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 interstitial keratitis, right eye is a billable ICD-10-CM diagnosis code (H16.321). | Diffuse interstitial keratitis, unspecified eye is a billable ICD-10-CM diagnosis code (H16.329). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources