H70.009 Acute mastoiditis without complications, unspecified ear

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from H70.0 Acute mastoiditis

Applicable to

• Abscess of mastoid
• Empyema of mastoid

MS-DRG index

Defines the logic of DRG(s) 152-153 in MDC 03.

Approximate ICD-9-CM (GEMs)

• 383.00 Acute mastoiditis without complications (approximate)

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

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to H70.009

Back-references to H70

• Type 2 Excludes: H74 Other disorders of middle ear mastoid ("mastoiditis (H70.-)")

Nearby codes

• H70.0 Acute mastoiditis
• H70.00 Acute mastoiditis without complications
• H70.001 Acute mastoiditis without complications, right ear
• H70.002 Acute mastoiditis without complications, left ear
• H70.003 Acute mastoiditis without complications, bilateral
• H70.009 Acute mastoiditis without complications, unspecified ear (this code)
• H70.01 Subperiosteal abscess of mastoid
• H70.011 Subperiosteal abscess of mastoid, right ear
• H70.012 Subperiosteal abscess of mastoid, left ear
• H70.013 Subperiosteal abscess of mastoid, bilateral
• H70.019 Subperiosteal abscess of mastoid, unspecified ear