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ICD-10-CM 2027 diagnosis code

C40Malignant neoplasm of bone and articular cartilage of limbs

Not billable — use a more specific code

C40 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C40

C40 is the ICD-10-CM diagnosis code for malignant neoplasm of bone and articular cartilage of limbs. It belongs to block C40-C41 (malignant neoplasms of bone and articular cartilage) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: C40.0 (limb), C40.1 (limb), C40.2 (limb), C40.3 (limb), C40.8 (limb) and C40.9 (limb).

Use an additional code to identify major osseous defect, if applicable (M89.7-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C40

Coding notes

Use additional codeAdd a secondary code to fully describe the condition
  • code to identify major osseous defect, if applicable (M89.7-)

Notes that apply from higher levels

Instructions written at a parent level also apply to C40.

Broader instructions also apply from C40-C41 Malignant neoplasms of bone and articular cartilage and Chapter 2: Neoplasms.

Codes whose notes reference C40

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C40

Is C40 billable?

No. C40 is a header code. Report one of its more specific subcodes instead.