ICD-10 Code I88 – Nonspecific lymphadenitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I88 – Nonspecific lymphadenitis
What it is
I88 identifies lymphadenitis that is not otherwise specified by site or cause. Use it when the record documents inflamed lymph nodes, but does not name a more specific diagnosis.
Clinical signs
Typical findings include enlarged, tender, or painful lymph nodes, sometimes with local redness or warmth. Clinical features vary; refer to documentation.
When to use this code
Use I88 when the clinician documents lymphadenitis without identifying a specific infectious organism, body site, or other qualifying detail. It also fits when the note says “nonspecific lymphadenitis” or similar wording. If a more specific code is supported, report that instead.
Do not use for
Do not use this code for lymph node enlargement without inflammation, or for clearly specified infectious or regional lymphadenitis. Check documentation if the record identifies a different cause or an anatomic site.
Coding tip
Code the documented level of specificity; when the note is vague, use I88 only after confirming no more specific lymphadenitis code applies.