C79.5Secondary malignant neoplasm of bone and bone marrow

C79.5 is the ICD-10-CM diagnosis code for secondary malignant neoplasm of bone and bone marrow. It belongs to category C79 (secondary malignant neoplasm of other and unspecified sites), block C76-C80 (malignant neoplasms of ill-defined, other secondary and unspecified sites) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within C79 (secondary malignant neoplasm of other and unspecified sites), C79.5 is specifically for secondary malignant neoplasm of bone and bone marrow. Related codes cover kidney and renal pelvis (C79.0), bladder and other and unspecified urinary organs (C79.1), skin (C79.2), brain and cerebral meninges (C79.3), other and unspecified parts of nervous system (C79.4), ovary (C79.6), adrenal gland (C79.7), other specified sites (C79.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: C79.51 (bone) and C79.52 (marrow).

Don't report C79.5 together with the conditions in its Excludes1 note: secondary carcinoid tumors of bone (C7B.03).

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