H75.00 Mastoiditis in infectious and parasitic diseases classified elsewhere, unspecified ear

Billable ICD-10-CM code, FY2026.

Applies from H75 Other disorders of middle ear and mastoid in diseases classified elsewhere

Code first

• underlying disease

Applies from H75.0 Mastoiditis in infectious and parasitic diseases classified elsewhere

Excludes1 (never code together)

• mastoiditis (in):
• syphilis (A52.77)
• tuberculosis (A18.03)

MS-DRG index

Defines the logic of DRG(s) 154-156 in MDC 03.

Approximate ICD-9-CM (GEMs)

• 383.89 Other disorders of mastoid (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Nearby codes

• H75 Other disorders of middle ear and mastoid in diseases classified elsewhere
• H75.0 Mastoiditis in infectious and parasitic diseases classified elsewhere
• H75.00 Mastoiditis in infectious and parasitic diseases classified elsewhere, unspecified ear (this code)
• H75.01 Mastoiditis in infectious and parasitic diseases classified elsewhere, right ear
• H75.02 Mastoiditis in infectious and parasitic diseases classified elsewhere, left ear
• H75.03 Mastoiditis in infectious and parasitic diseases classified elsewhere, bilateral
• H75.8 Other specified disorders of middle ear and mastoid in diseases classified elsewhere
• H75.80 Other specified disorders of middle ear and mastoid in diseases classified elsewhere, unspecified ear