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B85.0 — Pediculosis due to Pediculus humanus capitis
B85.0
What this code means
Head lice infestation: tiny insects living on the scalp, spread by head-to-head contact, common in schoolchildren.
Also called: head lice, pediculosis capitis, nits.
When this code is used
Used for head-louse infestation.
Where it sits in ICD-10-CM
Code B85.0 belongs to Chapter 1: Infectious and parasitic diseases, which covers codes A00–B99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Frequently asked questions
What is ICD-10-CM code B85.0?
B85.0 is the ICD-10-CM diagnosis code for “Pediculosis due to Pediculus humanus capitis”. Head lice infestation: tiny insects living on the scalp, spread by head-to-head contact, common in schoolchildren.
When is code B85.0 used?
Used for head-louse infestation. It belongs to Chapter 1 of ICD-10-CM (Infectious and parasitic diseases).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.