2026 ICD-10-CM Diagnosis Code C94.30Mast cell leukemia not having achieved remission
ICD-10-CM Codes›C00–D49›C81-C96›C94
- Billable — Valid for Submission
- Chronic Condition
C94.30 is a billable ICD-10-CM diagnosis code for mast cell leukemia 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 malignant mastocytosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Leukemia - all other types.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Malignant mastocytosis
- Mast cell leukemia
- Mast cell leukemia affecting skin
- Systemic mast cell disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Mast cell leukemia with failed remission
- Mast cell leukemia 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.
Patient EducationClinical
Leukemia
Leukemia is a term for cancers of the blood cells. Leukemia starts in blood-forming tissues such as the bone marrow. Your bone marrow makes the cells which will develop into white blood cells, red blood cells, and platelets. Each type of cell has a different job:
The full article covers:
- What is leukemia?
- What are the types of leukemia?
- What causes leukemia?
- Who is at risk for leukemia?
- What are the symptoms of leukemia?
- How is leukemia diagnosed?
- What are the treatments for leukemia?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C94.30 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C94.30Overview
Is C94.30 (Mast cell leukemia) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report mast cell leukemia not having achieved remission on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C94.30 group to?
When mast cell leukemia 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 C94.30?
Under the General Equivalence Mappings, mast cell leukemia not having achieved remission converts to ICD-9-CM 207.80 (oth leuk w/o achv 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.
