2026 ICD-10-CM Diagnosis Code C84.0AMycosis fungoides, in remission

ICD-10-CM Codes›C00–D49›C81-C96›C84

ICD-10-CM C84.0A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C84.0A is a billable ICD-10-CM diagnosis code for mycosis fungoides, 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
C84.0A
Billable Status
Yes — Valid for Submission
Code Describes
Mycosis fungoides, in remission
Short Description
Mycosis fungoides, in remission
Same as the full description in the CMS dataset.
Parent Code
C84.0
Mycosis fungoides

Code Classification

ChapterC00–D49Neoplasms
SectionC81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue
CategoryC84Mature T/NK-cell lymphomas
This CodeC84.0AMycosis fungoides, 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

Clinical InformationClinical

  • Mycosis Fungoides

    a chronic, malignant t-cell lymphoma of the skin. in the late stages, the lymph nodes and viscera are affected.

  • Lymph Nodes

    they are oval or bean shaped bodies (1 - 30 mm in diameter) located along the lymphatic system.

Code History & ChangesHistory

Replacement C84.0A replaces the following previously assigned code(s):

  • Z85.72 - Personal history of non-Hodgkin lymphomas
FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C84.0AOverview

Is C84.0A (Mycosis fungoides) a billable code?

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

What MS-DRG does C84.0A group to?

When mycosis fungoides, 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.

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.