ICD-10-CM 2027
ICD-10 code for long bones ameloblastoma
Malignant neoplasm of unspecified bones and articular cartilage of limb
From the official ICD-10-CM alphabetic index entry “Ameloblastoma › long bones”. Page updated September 29, 2026.
About coding long bones ameloblastoma
The ICD-10-CM code for long bones ameloblastoma is C40.9 (Malignant neoplasm of unspecified bones and articular cartilage of limb). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on C40.9.
Within C40, choose C40.9 (unspecified bones and articular cartilage of limb) only when documentation doesn't support a more specific option: scapula and long bones of upper limb (C40.0), short bones of upper limb (C40.1), long bones of lower limb (C40.2), short bones of lower limb (C40.3) and overlapping sites of bone and articular cartilage of limb (C40.8).
To report this condition, pick the subcode that matches the documentation: C40.90 (limb), C40.91 (limb) and C40.92 (limb).
Use an additional code to identify major osseous defect, if applicable (M89.7-).
More specific long bones ameloblastoma codes (official index)
Common questions about long bones ameloblastoma ICD-10 codes
What is the ICD-10 code for long bones ameloblastoma?
- C40.9 — Malignant neoplasm of unspecified bones and articular cartilage of limb (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: C40.2, C40.0.
What is the ICD-10 code for lower limb long bones ameloblastoma?
- C40.2 — Malignant neoplasm of long bones of lower limb (header code; choose a more specific subcode).
What is the ICD-10 code for upper limb long bones ameloblastoma?
- C40.0 — Malignant neoplasm of scapula and long bones of upper limb (header code; choose a more specific subcode).
Is C40.9 billable?
- No. C40.9 is a header code. Report one of its more specific subcodes instead.