Acute mastoiditis without complications, unspecified ear

This code signifies an acute inflammatory process of the mastoid air cells, typically a complication of acute otitis media, without any specified complications such as facial paralysis, abscess, or intracranial extension. It represents the initial, uncomplicated presentation of mastoiditis.

Apply this code when documentation confirms acute mastoiditis and explicitly states the absence of complications, or when no complications are mentioned. This diagnosis is often supported by clinical findings like postauricular pain, swelling, erythema, and fever, in conjunction with imaging (e.g., CT scan) confirming mastoid inflammation.

• Ensure the documentation specifically states "without complications" or implies their absence.
• Avoid using this code if any complications (e.g., subperiosteal abscess, facial nerve palsy) are noted; instead, select a more specific code.
• Always specify the laterality (left, right, or bilateral) if known, as this code is for an unspecified ear.