H66.90 (Otitis media, unspecified, unspecified ear) compared with H66.91 (Otitis media, unspecified, right ear), from the official CMS tabular data. H66.90 and H66.91 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. H66.90 and H66.91 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.
| H66.90Otitis media, unspecified, unspecified ear | H66.91Otitis media, unspecified, right ear | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | H60-H95 — Diseases of the ear and mastoid process | H60-H95 — Diseases of the ear and mastoid process |
| Definition | Otitis media, unspecified, unspecified ear is a billable ICD-10-CM diagnosis code (H66.90). | Otitis media, unspecified, right ear is a billable ICD-10-CM diagnosis code (H66.91). |
| Includes | suppurative and unspecified otitis media with myringitis | suppurative and unspecified otitis media with myringitis |
| Use additional code | code for any associated perforated tympanic membrane (H72.-) code to identify: exposure to environmental tobacco smoke (Z77.22) | code for any associated perforated tympanic membrane (H72.-) code to identify: exposure to environmental tobacco smoke (Z77.22) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources