ICD-10 Code B83.4 – Internal hirudiniasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B83.4 – Internal hirudiniasis
What it is
Use this code for infestation by leeches inside the body, not on the skin surface. It describes an internal parasitic attachment that may affect the throat, nose, or other mucosal sites.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include unexplained bleeding, irritation, or a visible or suspected leech attached to an internal mucosal surface.
When to use this code
Assign B83.4 when the record clearly documents internal hirudiniasis or an internal leech infestation. Use it for confirmed or clinically documented cases involving internal attachment, not general parasitic exposure. Check documentation if the site is unclear.
Do not use for
Do not use this code for external leech bites or superficial skin infestation. If the note only mentions possible exposure or a different parasitic condition, verify the diagnosis before coding.
Coding tip
Code the condition only when the provider documents an internal leech infestation; otherwise, query for clarification.