H75.0Mastoiditis in infectious and parasitic diseases classified elsewhere

H75.0 is the ICD-10-CM diagnosis code for mastoiditis in infectious and parasitic diseases classified elsewhere. It belongs to category H75 (other disorders of middle ear and mastoid in diseases classified elsewhere), block H65-H75 (diseases of middle ear and mastoid) and chapter 8 (diseases of the ear and mastoid process). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within H75 (other disorders of middle ear and mastoid in diseases classified elsewhere), H75.0 is specifically for mastoiditis in infectious and parasitic diseases classified elsewhere. Related codes cover other specified disorders of middle ear and mastoid in diseases classified elsewhere (H75.8).

To report this condition, pick the subcode that matches the documentation: H75.00 (unspecified ear), H75.01 (right ear), H75.02 (left ear) and H75.03 (bilateral).

Don't report H75.0 together with the conditions in its Excludes1 note: syphilis (A52.77) and tuberculosis (A18.03).

Code first: underlying disease.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.