C90
C90 — Multiple myeloma and malignant plasma cell neoplasms
Non-billable headerICD-10-CM
C90 is a non-billable header ICD-10-CM code for multiple myeloma and malignant plasma cell neoplasms. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues (Z85.79)
Other codes that can never be billed with C90
These codes carry an Excludes1 note pointing at C90. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C90 alone.
Risk adjustment
C90 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead C90
4 child codes. Green means billable.
Questions about C90
- Is C90 a billable ICD-10-CM code?
- No. C90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C90 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96).
- What cannot be coded together with C90?
- C90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.