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R59

Non-billable

Enlarged lymph nodes

R59 is the ICD-10-CM code for Enlarged lymph nodes. It is a non-billable category code — use a more specific child code such as R59.0 for billing.

Status
Header (non-billable)
Chapter
R00-R99
Subcodes
3
Edition
FY2026

R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

Includes

  • •swollen glands

Excludes1 — not coded here

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

Frequently asked questions

What is ICD-10 code R59?
R59 is the ICD-10-CM code for "Enlarged lymph nodes". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Is R59 a billable code?
No — R59 is a non-billable header code. Use a more specific child code (such as R59.0) for billing.
What are the subcodes of R59?
R59 has 3 more specific child codes, including R59.0, R59.1, R59.9.
What is excluded from R59?
Excludes1 (not coded here): lymphadenitis NOS (I88.9); acute lymphadenitis (L04.-); chronic lymphadenitis (I88.1); mesenteric (acute) (chronic) lymphadenitis (I88.0).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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