ICD-10 Code I88.1 – Chronic lymphadenitis, except mesenteric (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I88.1 – Chronic lymphadenitis, except mesenteric
What it is
I88.1 identifies chronic inflammation of lymph nodes outside the mesenteric region. Use it when the record documents persistent lymph node enlargement or inflammation that is not limited to the abdomen.
Clinical signs
Findings may include enlarged, firm, or tender lymph nodes that persist over time. Clinical features vary; refer to documentation for the involved node group and whether the process is chronic.
When to use this code
Use I88.1 when the provider documents chronic lymphadenitis and does not specify a different cause or site such as mesenteric nodes. It also fits follow-up notes that continue to describe chronic nodal inflammation. Check documentation if the record mentions acute infection, generalized lymphadenopathy, or a more specific diagnosis.
Do not use for
Do not use this code for mesenteric lymphadenitis or for acute lymphadenitis. If the chart identifies a different underlying condition, code the more specific diagnosis instead.
Coding tip
Confirm that “chronic” and “except mesenteric” are both supported in the note before assigning I88.1.