2026 ICD-10-CM Diagnosis Code C83.398Diffuse large B-cell lymphoma of other extranodal and solid organ sites

ICD-10-CM Codes›C00–D49›C81-C96›C83

ICD-10-CM C83.398
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C83.398 is a billable ICD-10-CM diagnosis code for diffuse large B-cell lymphoma of other extranodal and solid organ sites. 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, 974 through 976. Coders also document this condition as b cell lymphoma of small intestine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Non-Hodgkin lymphoma.

Code Identity

ICD-10-CM Code
C83.398
Billable Status
Yes — Valid for Submission
Code Describes
Diffuse large B-cell lymphoma of other extranodal and solid organ sites
Short Description
Diffuse large B-cell lymph of extrnod and solid organ sites
Parent Code
C83.39
Diffuse large B-cell lymphoma, extranodal and solid organ sites

Code Classification

ChapterC00–D49Neoplasms
SectionC81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue
CategoryC83Non-follicular lymphoma
This CodeC83.398Diffuse large B-cell lymphoma of other extranodal and solid organ sites

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • B cell lymphoma of small intestine
  • Diffuse large B-cell lymphoma of small intestine
  • Diffuse large B-cell lymphoma of stomach
  • Lymphoma of small bowel
  • Non-Hodgkin's lymphoma of intestine
  • Non-Hodgkin's lymphoma of stomach

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.

    • Lymphoma(of) (malignant)
      • diffuse large cell
        • extranodal and solid organ sites NEC

Clinical ClassificationClinical

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

CCSR NEO058
Non-Hodgkin lymphoma
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement C83.398 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 C83.398Overview

Is C83.398 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report diffuse large B-cell lymphoma of other extranodal and solid organ sites on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C83.398 group to?

When diffuse large B-cell lymphoma of other extranodal and solid organ sites is the principal diagnosis on an inpatient stay, it groups to MS-DRG 820, 821, 822, 823, 824, 825, 840, 841, 842, 974, 975, 976, with relative weights from 0.8945 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.