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H66.90 — Otitis media, unspecified, unspecified ear
H66.90
What this code means
Otitis media is infection or inflammation of the middle ear, common in children, causing earache and fever.
Also called: otitis media, middle ear infection.
When this code is used
Used for otitis media of an unspecified ear, type unspecified.
Where it sits in ICD-10-CM
Code H66.90 belongs to Chapter 8: Diseases of the ear and mastoid process, which covers codes H60–H95 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code H66.90?
H66.90 is the ICD-10-CM diagnosis code for “Otitis media, unspecified, unspecified ear”. Otitis media is infection or inflammation of the middle ear, common in children, causing earache and fever.
When is code H66.90 used?
Used for otitis media of an unspecified ear, type unspecified. It belongs to Chapter 8 of ICD-10-CM (Diseases of the ear and mastoid process).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.