C01 is the authoritative medical code for Malignant neoplasm of base of tongue. This classification is used in medical billing and clinical recording to specify the clinical criteria for malignant neoplasm of base of tongue (ICD-10-CM C01), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Malignant neoplasm of base of tongue is a billable ICD-10-CM diagnosis code C01. Inclusion terms: 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.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for C01 in the official ICD-10-CM tabular list.
Inclusion Terms
Alternative terms the tabular list files under this code.
- 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
Supplementary codes the tabular list directs you to add.
- code to identify:
- alcohol abuse and dependence F10.-
- history of tobacco dependence Z87.891
- tobacco dependence F17.-
- tobacco use Z72.0
Frequently Asked Questions (FAQ) & Clinical Guidance
Is an additional code needed with C01?
Use additional code(s) to specify: code to identify:; alcohol abuse and dependence (F10.-); history of tobacco dependence (Z87.891); tobacco dependence (F17.-).
What conditions are included under C01?
Malignant neoplasm of base of tongue 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.
Codes in This Family (1)
Official ICD-10-CM classifications in the same code family as C01, with their registry titles.
- C01-C02 — Malignant neoplasms of lip, oral cavity and pharynx (C01-C02)
Neoplasm Table Sites (5)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, tongue, base (dorsal surface) — Malignant, Primary
- Neoplasm, neoplastic, tongue, fixed part NEC — Malignant, Primary
- Neoplasm, neoplastic, tongue, posterior (third) — Malignant, Primary
- Neoplasm, neoplastic, tongue, root — Malignant, Primary
- Neoplasm, neoplastic, tongue, surface (dorsal), base — Malignant, Primary
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code C02
Malignant neoplasm of other and unspecified parts of tongue
ICD Code C06
Malignant neoplasm of other and unspecified parts of mouth