2026 ICD-10-CM Diagnosis Code I89.1Lymphangitis

ICD-10-CM Codes›I00–I99›I80-I89›I89

ICD-10-CM I89.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I89.1 is a billable ICD-10-CM diagnosis code for lymphangitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 602 through 603. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified diseases of veins and lymphatics.

Code Identity

ICD-10-CM Code
I89.1
Billable Status
Yes — Valid for Submission
Code Describes
Lymphangitis
Short Description
Lymphangitis
Same as the full description in the CMS dataset.
Parent Code
I89
Other noninfective disorders of lymphatic vessels and lymph nodes

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI89Other noninfective disorders of lymphatic vessels and lymph nodes
This CodeI89.1Lymphangitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of skin with lymphangitis
  • Ascending lymphangitis
  • Ascending lymphangitis caused by bacterium
  • Cellulitis of skin with lymphangitis
  • Chronic disease of lymphatic vessels
  • Chronic lymphangitis
  • Infectious lymphangitis
  • Localized cutaneous leishmaniasis co-occurrent with nodular lymphangitis
  • Localized infection of skin AND/OR subcutaneous tissue
  • Lymphangitis
  • Lymphangitis caused by bacterium
  • Lymphangitis of breast associated with childbirth
  • Obstetric lymphangitis of breast
  • Subacute lymphangitis

Tabular List NotesGuidance

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

Inclusion Terms

  • Chronic lymphangitis
  • Lymphangitis NOS
  • Subacute lymphangitis

Type 1 Excludes

  • acute lymphangitis L03

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.

    • Gangrene, gangrenous(connective tissue) (dropsical) (dry) (moist) (skin) (ulcer)
      • lymphangitis
    • Lymphangitis
    • Lymphangitis
      • chronic (any site)
    • Lymphangitis
      • subacute (any site)

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

  • Lymphangitis

    a lymphatic disease characterized by inflammation of lymphatic vessels.

  • Lymphangitis

    inflammation of the lymphatic vessels.

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 I89.1 to ICD-9-CMHistory

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

ICD-9-CM
457.2 Lymphangitis
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 I89.1Overview

Is I89.1 a billable code?

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

What MS-DRG does I89.1 group to?

When lymphangitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 602, 603, with relative weights from 0.8709 to 1.4213 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I89.1?

Under the General Equivalence Mappings, lymphangitis converts to ICD-9-CM 457.2 (lymphangitis). The mapping is a direct match.

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.