2026 ICD-10-CM Diagnosis Code C93.91Monocytic leukemia, unspecified in remission

ICD-10-CM Codes›C00–D49›C81-C96›C93

ICD-10-CM C93.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C93.91 is a billable ICD-10-CM diagnosis code for monocytic leukemia, unspecified in 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Leukemia in remission.

Code Identity

ICD-10-CM Code
C93.91
Billable Status
Yes — Valid for Submission
Code Describes
Monocytic leukemia, unspecified in remission
Short Description
Monocytic leukemia, unspecified in remission
Same as the full description in the CMS dataset.
Parent Code
C93.9
Monocytic leukemia, unspecified

Code Classification

ChapterC00–D49Neoplasms
SectionC81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue
CategoryC93Monocytic leukemia
This CodeC93.91Monocytic leukemia, unspecified in remission

Clinical ClassificationClinical

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

CCSR NEO075
Leukemia in remission
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Acute Myeloid 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 is acute myeloid leukemia (AML)?
  • What causes acute myeloid leukemia (AML)?
  • Who is at risk for acute myeloid leukemia (AML)?
  • What are the symptoms of acute myeloid leukemia (AML)?
  • How is acute myeloid leukemia (AML) diagnosed?
  • What are the treatments for acute myeloid leukemia (AML)?

Read the full article at MedlinePlus

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

Convert C93.91 to ICD-9-CMHistory

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

ICD-9-CM
206.21 Sbac mono leuk w rmsion
Approximate The match is approximate rather than exact.
ICD-9-CM
206.91 Uns mono leuk w rmsion
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C93.91Overview

Is C93.91 (Monocytic leukemia, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report monocytic leukemia, unspecified in remission on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C93.91 group to?

When monocytic leukemia, unspecified in 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 C93.91?

Under the General Equivalence Mappings, monocytic leukemia, unspecified in remission converts to ICD-9-CM 206.21 (sbac mono leuk w rmsion) and 206.91 (uns mono leuk w rmsion). 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.