ICD-10 Code D71.8 – Other functional disorders of polymorphonuclear neutrophils (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D71.8 – Other functional disorders of polymorphonuclear neutrophils
What it is
This code identifies a functional problem affecting polymorphonuclear neutrophils, the white blood cells that help fight infection. Use it when the record documents an abnormal neutrophil function not captured by a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe recurrent or unusual infections, impaired inflammatory response, or laboratory evidence of neutrophil dysfunction.
When to use this code
Use D71.8 when the clinician documents another specified neutrophil functional disorder and no narrower code applies. It may fit cases where the abnormality is functional rather than a low neutrophil count. Code only when the diagnosis is clearly stated in the chart.
Do not use for
Do not use this code for neutropenia, unspecified immune deficiency, or general infection without documented neutrophil dysfunction. Check documentation if the record only mentions abnormal white blood cell results.
Coding tip
Confirm the provider describes a functional neutrophil disorder, not a count abnormality, before assigning D71.8.