NPI Atlas

C06 – Malignant neoplasm of other and unspecified parts of mouth

ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lip, oral cavity and pharynx

Non-billable header

ICD-10-CM code C06

Code: C06 (claims format: C06)
Description: Malignant neoplasm of other and unspecified parts of mouth
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 2. Neoplasms (C00-D49)
Block: C00-C14 Malignant neoplasms of lip, oral cavity and pharynx

Billable codes under C06

C06 is a header code and cannot be used on claims. Choose the most specific code:

C06.0 – Malignant neoplasm of cheek mucosaBillable
C06.1 – Malignant neoplasm of vestibule of mouthBillable
C06.2 – Malignant neoplasm of retromolar areaBillable
C06.8 – Malignant neoplasm of overlapping sites of other and unspecified parts of mouthHeader (more codes below)
C06.9 – Malignant neoplasm of mouth, unspecifiedBillable

Notes for C06

Use additional code:

code to identify:
alcohol abuse and dependence (F10.-)
history of tobacco dependence (Z87.891)
tobacco dependence (F17.-)
tobacco use (Z72.0)

Frequently asked questions

What is ICD-10 code C06?

C06 is the ICD-10-CM code for malignant neoplasm of other and unspecified parts of mouth, in the block C00-C14 (Malignant neoplasms of lip, oral cavity and pharynx).

Is C06 a billable code?

No. C06 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.