ICD-10 Code A69.2 – Lyme disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A69.2 – Lyme disease
What it is
Use this code for Lyme disease, a tick-borne infection caused by Borrelia species. It covers the clinical diagnosis when documentation identifies Lyme disease without needing a more specific manifestation code.
Clinical signs
Common findings include erythema migrans, fever, fatigue, headache, and muscle or joint aches. Clinical features vary; refer to documentation, especially when neurologic, cardiac, or joint involvement is noted.
When to use this code
Assign A69.2 when the provider documents Lyme disease as the confirmed diagnosis. Use it for outpatient, inpatient, or emergency records when the chart does not specify a separate manifestation code.
If the record names a complication such as arthritis or neurologic disease, code the documented condition set according to the record. Check documentation for whether Lyme disease is the principal or additional diagnosis.
Do not use for
Do not use this code for nonspecific tick bite exposure or suspected Lyme disease without confirmation. Do not use it when the documentation supports another tick-borne illness instead.
Coding tip
Look for explicit provider wording of “Lyme disease” and any documented manifestation, then code both when supported by the record.