Insect bite (nonvenomous) of unspecified thumb, init encntr

This code signifies a non-venomous insect bite affecting an unspecified thumb. It indicates the initial phase of treatment for such an injury, implying the patient is presenting for the first time for this specific bite.

Apply this code when a patient presents with a documented insect bite on their thumb, and there is no indication of venomous exposure. This is appropriate for the initial visit where the bite is first evaluated and treated.

• Ensure documentation specifies "nonvenomous" and the affected digit is the thumb.
• Confirm this is the patient's first encounter for this specific injury to justify the "A" seventh character.
• If the laterality (left or right thumb) is known, a more specific code should be used.