C01

Billable
ChapterC00–D49
Rankcategory
Official Description

Malignant neoplasm of base of tongue

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 2: Neoplasms (C00-D49).

Instructional Notes

Includes
  • Malignant neoplasm of dorsal surface of base of tongue
  • Malignant neoplasm of fixed part of tongue NOS
  • Malignant neoplasm of posterior third of tongue
Use Additional Code
  • code to identify:
  • alcohol abuse and dependence (F10.-)
  • history of tobacco dependence (Z87.891)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Clinical Hierarchy

CH2Neoplasms (C00-D49)
C00-C14Malignant neoplasms of lip, oral cavity and pharynx (C00-C14)
C01Malignant neoplasm of base of tongue

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to C01. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

5 raw paths
Neoplasm, neoplastic5 unique routes
tongue(5 variants)
base (dorsal surface)→C01
fixed part NEC→C01
posterior (third)→C01
root→C01
surface (dorsal)
base→C01

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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