ICD-10 Code A69.20 – Lyme disease, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A69.20 – Lyme disease, unspecified
What it is
A69.20 identifies Lyme disease when the record confirms Lyme disease but does not specify the stage or a particular manifestation. Use it for an unspecified presentation of Borrelia burgdorferi infection.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include erythema migrans, fever, fatigue, headache, myalgias, or later neurologic, cardiac, or joint involvement.
When to use this code
Use this code when the clinician documents Lyme disease without naming early localized, disseminated, or late disease. It also fits when the chart confirms Lyme disease but does not support a more specific code.
If the note names a specific manifestation, code that condition instead of the unspecified Lyme disease code. Check documentation when the stage, site, or associated complication is unclear.
Do not use for
Do not use A69.20 for suspected Lyme disease, exposure without confirmed infection, or other tick-borne illnesses. Do not use it when a more specific Lyme code is documented.
Coding tip
Review the provider’s assessment for stage or complication details before defaulting to the unspecified code.