H70.91 Unspecified mastoiditis, right ear

Billable ICD-10-CM code, FY2026.

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 383.9 Unspecified mastoiditis (approximate)

Code annotations containing back-references to H70.91

Back-references to H70

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

Nearby codes

• H70.892 Other mastoiditis and related conditions, left ear
• H70.893 Other mastoiditis and related conditions, bilateral
• H70.899 Other mastoiditis and related conditions, unspecified ear
• H70.9 Unspecified mastoiditis
• H70.90 Unspecified mastoiditis, unspecified ear
• H70.91 Unspecified mastoiditis, right ear (this code)
• H70.92 Unspecified mastoiditis, left ear
• H70.93 Unspecified mastoiditis, bilateral