ICD-10 Code D72.810 – Lymphocytopenia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D72.810 – Lymphocytopenia
What it is
Lymphocytopenia means an abnormally low number of lymphocytes in the blood. It is a laboratory finding or diagnosis that may reflect infection, immune suppression, or another underlying condition.
Clinical signs
Clinical features vary; refer to documentation. Patients may have recurrent or unusual infections, but the code is based on documented lymphocyte reduction rather than symptoms alone.
When to use this code
Use D72.810 when the provider documents lymphocytopenia, lymphopenia, or low lymphocyte count as a diagnosis. It is also appropriate when the condition is being evaluated or followed as a clinically relevant finding. Code the underlying cause separately when documented.
Do not use for
Do not use this code for other white blood cell disorders, such as neutropenia or leukopenia, unless lymphocytopenia is specifically documented. Check documentation if the low lymphocyte finding is only a transient lab result.
Coding tip
Verify that the record clearly supports lymphocytopenia and capture any documented underlying condition as well.