Pediculus capitis [head louse]

This code identifies an infestation of the scalp and hair by the parasitic insect Pediculus humanus capitis, commonly known as head lice. This condition is characterized by intense itching, often leading to excoriations, and the presence of nits (lice eggs) firmly attached to hair shafts.

Use this code when documentation confirms a diagnosis of head lice infestation. This typically occurs after visual inspection of the scalp and hair reveals live lice or nits, often in school-aged children or individuals in close-contact environments. Supporting documentation includes physician notes detailing the presence of lice or nits, and symptoms such as pruritus.

• Ensure documentation specifies Pediculus capitis to differentiate from other forms of pediculosis.
• Do not confuse with scabies (sarcoptic mange) or other dermatological conditions causing pruritus.
• This is a primary diagnosis code; no specific external cause code is typically required unless related to a specific exposure event.