H71.21 Cholesteatoma of mastoid, right ear

Billable ICD-10-CM code, FY2026.

Applies from H71 Cholesteatoma of middle ear

Excludes2 (not included here)

• cholesteatoma of external ear (H60.4-)
• recurrent cholesteatoma of postmastoidectomy cavity (H95.0-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 385.33 Cholesteatoma of middle ear and mastoid (approximate)

Code annotations containing back-references to H71.21

Back-references to H71

• Type 2 Excludes: H60.4 Cholesteatoma of external ear ("cholesteatoma of middle ear (H71.-)")

Nearby codes

• H71.11 Cholesteatoma of tympanum, right ear
• H71.12 Cholesteatoma of tympanum, left ear
• H71.13 Cholesteatoma of tympanum, bilateral
• H71.2 Cholesteatoma of mastoid
• H71.20 Cholesteatoma of mastoid, unspecified ear
• H71.21 Cholesteatoma of mastoid, right ear (this code)
• H71.22 Cholesteatoma of mastoid, left ear
• H71.23 Cholesteatoma of mastoid, bilateral
• H71.3 Diffuse cholesteatosis
• H71.30 Diffuse cholesteatosis, unspecified ear
• H71.31 Diffuse cholesteatosis, right ear