R59

ICD-10Non-billable category

Enlarged lymph nodes

Official ICD-10-CM descriptor (FY2026)

Enlarged lymph nodes

R59 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Includes

swollen glands

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

lymphadenitis NOS (I88.9)
acute lymphadenitis (L04.-)
chronic lymphadenitis (I88.1)
mesenteric (acute) (chronic) lymphadenitis (I88.0)

More specific codes under R59

Where this code sits

Chapter: 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block: General symptoms and signs (R50-R69)

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.