ICD-10 code for acute lymphadenitis

The ICD-10-CM code for acute lymphadenitis is L04.9 (Acute lymphadenitis, unspecified). The official index lists 10 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L04.9.

Within L04, choose L04.9 (unspecified) only when documentation doesn't support a more specific option: of face, head and neck (L04.0), of trunk (L04.1), of upper limb (L04.2), of lower limb (L04.3) and of other sites (L04.8).

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 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.