C90: Multiple myeloma and malignant plasma cell neoplasms
Codes under C90 (Multiple myeloma and malignant plasma cell neoplasms). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| C90.0 | Multiple myeloma | — |
| C90.0 | Multiple myeloma | — |
| C90.00 | Multiple myeloma not having achieved remission | ✓ |
| C90.00 | Multiple myeloma not having achieved remission | ✓ |
| C90.01 | Multiple myeloma in remission | ✓ |
| C90.01 | Multiple myeloma in remission | ✓ |
| C90.1 | Plasma cell leukemia | — |
| C90.1 | Plasma cell leukemia | — |
| C90.02 | Multiple myeloma in relapse | ✓ |
| C90.02 | Multiple myeloma in relapse | ✓ |
| C90.2 | Extramedullary plasmacytoma | — |
| C90.2 | Extramedullary plasmacytoma | — |
| C90.3 | Solitary plasmacytoma | — |
| C90.3 | Solitary plasmacytoma | — |
| C90.10 | Plasma cell leukemia not having achieved remission | ✓ |
| C90.10 | Plasma cell leukemia not having achieved remission | ✓ |
| C90.11 | Plasma cell leukemia in remission | ✓ |
| C90.11 | Plasma cell leukemia in remission | ✓ |
| C90.12 | Plasma cell leukemia in relapse | ✓ |
| C90.12 | Plasma cell leukemia in relapse | ✓ |
| C90.20 | Extramedullary plasmacytoma not having achieved remission | ✓ |
| C90.20 | Extramedullary plasmacytoma not having achieved remission | ✓ |
| C90.21 | Extramedullary plasmacytoma in remission | ✓ |
| C90.21 | Extramedullary plasmacytoma in remission | ✓ |
| C90.22 | Extramedullary plasmacytoma in relapse | ✓ |
| C90.22 | Extramedullary plasmacytoma in relapse | ✓ |
| C90.30 | Solitary plasmacytoma not having achieved remission | ✓ |
| C90.30 | Solitary plasmacytoma not having achieved remission | ✓ |
| C90.31 | Solitary plasmacytoma in remission | ✓ |
| C90.31 | Solitary plasmacytoma in remission | ✓ |
| C90.32 | Solitary plasmacytoma in relapse | ✓ |
| C90.32 | Solitary plasmacytoma in relapse | ✓ |
Frequently asked questions
What is ICD-10-CM code C90?
C90 is an ICD-10-CM category covering Multiple myeloma and malignant plasma cell neoplasms. It contains 32 more specific diagnosis codes, 24 of which are billable.
Is C90 a billable code?
No — C90 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example C90.0 — Multiple myeloma). 24 of the 32 codes under C90 are billable.
What codes fall under C90?
C90 includes C90.0, C90.0, C90.00, C90.00, C90.01, plus 27 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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