2026 ICD-10-CM Diagnosis Code I88.1Chronic lymphadenitis, except mesenteric

ICD-10-CM Codes›I00–I99›I80-I89›I88

ICD-10-CM I88.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I88.1 is a billable ICD-10-CM diagnosis code for chronic lymphadenitis, except mesenteric. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 814 through 816. Coders also document this condition as axillary lymphadenopathy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified diseases of veins and lymphatics.

Code Identity

ICD-10-CM Code
I88.1
Billable Status
Yes — Valid for Submission
Code Describes
Chronic lymphadenitis, except mesenteric
Short Description
Chronic lymphadenitis, except mesenteric
Same as the full description in the CMS dataset.
Parent Code
I88
Nonspecific lymphadenitis

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI88Nonspecific lymphadenitis
This CodeI88.1Chronic lymphadenitis, except mesenteric

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Axillary lymphadenopathy
  • Cervical lymphadenitis
  • Chronic axillary lymphadenitis
  • Chronic cervical lymphadenitis
  • Chronic inguinal lymphadenitis
  • Chronic lymphadenitis
  • Inguinal lymphadenopathy

Tabular List NotesGuidance

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

Inclusion Terms

  • Adenitis
  • Lymphadenitis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR CIR039
Other specified diseases of veins and lymphatics
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Chronic Lymphadenitis

    inflammation of the lymph nodes that is chronic in nature.

  • Cervical Lymphadenitis

    inflammation of the cervical lymph nodes.

Patient EducationClinical

Lymphatic Diseases

The lymphatic system is a network of tissues and organs. It is made up of:

Read the full article at MedlinePlus

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

Convert I88.1 to ICD-9-CMHistory

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

ICD-9-CM
289.1 Chronic lymphadenitis
Exact Match The mapping is direct, with no qualifiers.

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 I88.1Overview

What is the ICD-10 code for chronic lymphadenitis, except mesenteric?

The ICD-10-CM code for chronic lymphadenitis, except mesenteric is I88.1 (sometimes written as I881). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is I88.1 (Nonspecific lymphadenitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic lymphadenitis, except mesenteric on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I88.1 group to?

When chronic lymphadenitis, except mesenteric is the principal diagnosis on an inpatient stay, it groups to MS-DRG 814, 815, 816, with relative weights from 0.6320 to 2.1267 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I88.1?

Under the General Equivalence Mappings, chronic lymphadenitis, except mesenteric converts to ICD-9-CM 289.1 (chronic lymphadenitis). The mapping is a direct match.