C30.1 Malignant neoplasm of middle ear

Billable ICD-10-CM code, FY2026.

Applicable to

• Malignant neoplasm of antrum tympanicum
• Malignant neoplasm of auditory tube
• Malignant neoplasm of eustachian tube
• Malignant neoplasm of inner ear
• Malignant neoplasm of mastoid air cells
• Malignant neoplasm of tympanic cavity

Excludes1 (never code together)

• malignant neoplasm of auricular canal (external) (C43.2-,C44.2-)
• malignant neoplasm of bone of ear (meatus) (C41.0)
• malignant neoplasm of cartilage of ear (C49.0)
• malignant melanoma of skin of (external) ear (C43.2-)
• other and unspecified malignant neoplasm of skin of (external) ear (C44.2-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 21 — Lymphoma and Other Cancers
• CMS-HCC V22: HCC 11 — Colorectal, Bladder, and Other Cancers
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 11

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 160.1 Malignant neoplasm of auditory tube, middle ear, and mastoid air cells

Nearby codes

• C30 Malignant neoplasm of nasal cavity and middle ear
• C30.0 Malignant neoplasm of nasal cavity
• C30.1 Malignant neoplasm of middle ear (this code)