C90.21 — Extramedullary plasmacytoma in remission
C90.21 is a billable, specific ICD-10-CM code for extramedullary plasmacytoma in remission. It is valid for submission on a claim.
Other codes that can never be billed with C90.21
These codes carry an Excludes1 note pointing at C90.21. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C90.21 alone.
- Z85.79Personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues
Risk adjustment
C90.21 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 19 Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers1.798 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
C90.21 is named in 31 Medicare coverage policies — 31 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52399Billing and Coding: Denosumab (Prolia®, Xgeva®, Jubbonti®, Wyost®, Ospomyv™,Xbryk™,Bomyntra®, Conexxence®, Stoboclo®, Osenvelt®,Bildyos®, Bilprevda®)
- A52479Oral Anticancer Drugs - Policy Article
- A52479Oral Anticancer Drugs - Policy Article
- A52479Oral Anticancer Drugs - Policy Article
Related codes at this level
Codes that share C90.2. If C90.21 is not quite right, the correct code is usually one of these.
Questions about C90.21
- Is C90.21 a billable ICD-10-CM code?
- Yes. C90.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does C90.21 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96).