ICD-10 Code A93.2 – Colorado tick fever (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A93.2 – Colorado tick fever
What it is
Use this code for Colorado tick fever, a tick-borne viral illness. It represents the diagnosis itself, not a suspected exposure or a general tick bite.
Clinical signs
Typical features include acute fever, chills, headache, muscle aches, and fatigue after tick exposure. Clinical features vary; refer to documentation.
When to use this code
Assign A93.2 when the provider documents Colorado tick fever as the confirmed diagnosis. Use it for cases with compatible illness and clinical assessment tied to this specific infection. If the record only notes tick exposure, tick bite, or fever of unclear cause, check documentation before coding.
Do not use for
Do not use this code for nonspecific febrile illness, other tick-borne diseases, or mere exposure without a diagnosis. Do not substitute it for a tick bite code.
Coding tip
Confirm the provider names Colorado tick fever explicitly; otherwise, code the documented condition only.