H70.899 Other mastoiditis and related conditions, unspecified ear

Billable ICD-10-CM code, FY2026.

Applies from H70.8 Other mastoiditis and related conditions

Excludes1 (never code together)

• preauricular sinus and cyst (Q18.1)
• sinus, fistula, and cyst of branchial cleft (Q18.0)

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)

Code annotations containing back-references to H70.899

Back-references to H70

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

Nearby codes

• H70.819 Postauricular fistula, unspecified ear
• H70.89 Other mastoiditis and related conditions
• H70.891 Other mastoiditis and related conditions, right ear
• 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 (this code)
• H70.9 Unspecified mastoiditis
• H70.90 Unspecified mastoiditis, unspecified ear
• H70.91 Unspecified mastoiditis, right ear
• H70.92 Unspecified mastoiditis, left ear
• H70.93 Unspecified mastoiditis, bilateral