I89.1Lymphangitis

I89.1 is the ICD-10-CM diagnosis code for lymphangitis. It belongs to category I89 (other noninfective disorders of lymphatic vessels and lymph nodes), block I80-I89 (diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I89 (other noninfective disorders of lymphatic vessels and lymph nodes), I89.1 is specifically for lymphangitis. Related codes cover lymphedema, not elsewhere classified (I89.0), other specified noninfective disorders of lymphatic vessels and lymph nodes (I89.8) and noninfective disorder of lymphatic vessels and lymph nodes, unspecified (I89.9).

Don't report I89.1 together with the conditions in its Excludes1 note: acute lymphangitis (L03.-).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 602 (Cellulitis with MCC, relative weight 1.4273), DRG 603 (Cellulitis without MCC, relative weight 0.8635), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 457.2 (lymphangitis).