2026 ICD-10-CM Diagnosis Code C90.20Extramedullary plasmacytoma not having achieved remission
ICD-10-CM Codes›C00–D49›C81-C96›C90
- Billable — Valid for Submission
- Chronic Condition
C90.20 is a billable ICD-10-CM diagnosis code for extramedullary plasmacytoma not having achieved remission. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 820 through 825, 840 through 842. Coders also document this condition as extramedullary plasmacytoma. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Multiple myeloma.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Extramedullary plasmacytoma
- Plasmacytoma
- Primary cutaneous plasmacytoma
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Extramedullary plasmacytoma with failed remission
- Extramedullary plasmacytoma NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Interleukin-6
a cytokine that stimulates the growth and differentiation of b-lymphocytes and is also a growth factor for hybridomas and plasmacytomas. it is produced by many different cells including t-lymphocytes; monocytes; and fibroblasts.Plasmacytoma
any discrete, presumably solitary, mass of neoplastic plasma cells either in bone marrow or various extramedullary sites.
Patient EducationClinical
Multiple Myeloma
Multiple myeloma is a cancer that begins in plasma cells, a type of white blood cell. These cells are part of your immune system, which helps protect the body from germs and other harmful substances. In time, myeloma cells collect in the bone marrow and in the solid parts of bones.
Read the full article at MedlinePlus
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Convert C90.20 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C90.20Overview
Is C90.20 (Extramedullary plasmacytoma) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report extramedullary plasmacytoma not having achieved remission on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C90.20 group to?
When extramedullary plasmacytoma not having achieved remission is the principal diagnosis on an inpatient stay, it groups to MS-DRG 820, 821, 822, 823, 824, 825, 840, 841, 842, with relative weights from 1.0104 to 5.8648 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C90.20?
Under the General Equivalence Mappings, extramedullary plasmacytoma not having achieved remission converts to ICD-9-CM 203.80 (oth imno npl wo ach rmsn). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
