What does ICD-10 code R59 mean?

ICD-10 code R59 is the standardized code used for enlarged lymph nodes in medical records and coding systems.

When is ICD-10 code R59 used?

Doctors, hospitals, and insurers may use ICD-10 code R59 when recording enlarged lymph nodes in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code R59 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code R59: Enlarged lymph nodes

Name: ICD-10 Code R59: Enlarged lymph nodes
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:30:41.566Z

R59 is an ICD-10 diagnosis entry used to group records related to Enlarged lymph nodes. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

When is it used?

May be used when a clinician documents enlarged lymph nodes in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

block

R50-R69General symptoms and signs

currentR50-R69

Official coding notes

Includes

swollen glands

Excludes1 (do not code together)

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

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

General Physician

Sibling codes

R50Fever of other and unknown origin R51Headache R52Pain, unspecifiedbillable R53Malaise and fatigue R54Age-related physical debilitybillable R55Syncope and collapsebillable R56Convulsions, not elsewhere classified R57Shock, not elsewhere classified R58Hemorrhage, not elsewhere classifiedbillable R60Edema, not elsewhere classified R61Generalized hyperhidrosisbillable R62Lack of expected normal physiological development in childhood and adults R63Symptoms and signs concerning food and fluid intake R64Cachexiabillable R65Symptoms and signs specifically associated with systemic inflammation and infection R68Other general symptoms and signs R69Illness, unspecifiedbillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

R59

Replacement codes

R59.0 — Localized enlarged lymph nodesR59.1 — Generalized enlarged lymph nodesR59.9 — Enlarged lymph nodes, unspecified

Common synonyms

Enlarged lymph nodes

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.