2026 ICD-10-CM Diagnosis Code C94.6Myelodysplastic disease, not elsewhere classified

ICD-10-CM Codes›C00–D49›C81-C96›C94

ICD-10-CM C94.6
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C94.6 is a billable ICD-10-CM diagnosis code for myelodysplastic disease, not elsewhere classified. 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 myelodysplastic/myeloproliferative disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Leukemia - all other types.

Code Identity

ICD-10-CM Code
C94.6
Billable Status
Yes — Valid for Submission
Code Describes
Myelodysplastic disease, not elsewhere classified
Short Description
Myelodysplastic disease, not elsewhere classified
Same as the full description in the CMS dataset.
Parent Code
C94
Other leukemias of specified cell type

Code Classification

ChapterC00–D49Neoplasms
SectionC81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue
CategoryC94Other leukemias of specified cell type
This CodeC94.6Myelodysplastic disease, not elsewhere classified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Myelodysplastic/myeloproliferative disease
  • Myelodysplastic/myeloproliferative neoplasm, unclassifiable
  • Pulmonary hypertension due to hematological disorder
  • Pulmonary hypertension due to myeloproliferative disorder
  • Vasculitis due to myeloproliferative disorder

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Myelodysplastic/myeloproliferative neoplasm, unclassifiable
  • Myeloproliferative disease, not elsewhere classified

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disease, diseased
      • myelodysplastic
    • Disease, diseased
      • myelodysplastic/myeloproliferative neoplasm, unclassifiable
    • Disease, diseased
      • myeloproliferative
        • not classified
    • Disease, diseased
      • myeloproliferative
        • specified NEC
    • Disease, diseased
      • myeloproliferative
        • unclassifiable
    • Neoplasm, neoplastic
      • myelodysplastic/myeloproliferative, unclassifiable

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO064
Leukemia - all other types
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Myelodysplastic Syndromes

Your bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert C94.6 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
238.79 Lymph/hematpoitc tis NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2022No changes
FY 2023RevisedCode revised
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C94.6Overview

Is C94.6 (Other leukemias of specified cell type) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report myelodysplastic disease, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C94.6 group to?

When myelodysplastic disease, not elsewhere classified 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 C94.6?

Under the General Equivalence Mappings, myelodysplastic disease, not elsewhere classified converts to ICD-9-CM 238.79 (lymph/hematpoitc tis NEC). 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.