H70.099 Acute mastoiditis with other 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)

• 383.02 Acute mastoiditis with other 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 H70.099

Back-references to H70

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

Nearby codes

• H70.019 Subperiosteal abscess of mastoid, unspecified ear
• H70.09 Acute mastoiditis with other complications
• H70.091 Acute mastoiditis with other complications, right ear
• H70.092 Acute mastoiditis with other complications, left ear
• H70.093 Acute mastoiditis with other complications, bilateral
• H70.099 Acute mastoiditis with other complications, unspecified ear (this code)
• H70.1 Chronic mastoiditis
• H70.10 Chronic mastoiditis, unspecified ear
• H70.11 Chronic mastoiditis, right ear
• H70.12 Chronic mastoiditis, left ear
• H70.13 Chronic mastoiditis, bilateral