There is no CPT code dedicated specifically to tick removal. Instead, the correct coding depends on how the tick was removed. That’s the single most important detail your documentation needs to capture.

• Simple removal without an incision (for example, grasping the tick with fine-tipped forceps and pulling it out) is generally considered part of the evaluation and management (E/M) service. It’s reported with the appropriate office or outpatient E/M code rather than a separate procedure code.
• Removal that requires an incision into the skin to reach an embedded tick or retained mouthparts is typically reported with CPT 10120, incision and removal of foreign body, subcutaneous tissues; simple.
• Complicated removal, such as a more extensive dissection, may support CPT 10121, the complicated version of the same procedure.

Payer policies can vary, so always check your major payers’ guidance, but this framework covers the majority of tick removal encounters.

CPT 10120 and 10121 describe removal of a foreign body from the subcutaneous tissue through an incision. To support them, the provider’s note should describe the incision itself: the location, that an incision was made, how the tick or retained parts were removed, and any closure or wound care. A note that simply says “tick removed” will not support a procedure code.

Keep in mind that both codes carry a 10-day global period under the Medicare Physician Fee Schedule. Routine follow-up related to the procedure during that window isn’t separately billable. If the patient returns for an unrelated problem, or develops a new condition such as a suspected tick-borne illness, that visit may be billable with the appropriate modifier and documentation.

Many tick removal encounters involve more than the removal itself. The provider may take a history of the outdoor exposure, examine for a rash, counsel the patient on signs of Lyme disease or other tick-borne illnesses, and discuss whether prophylactic treatment is appropriate. When that work is significant and separately identifiable from the procedure, it may be reported as a separate E/M service with modifier 25 appended to the E/M code.

Modifier 25 is closely watched by payers, so documentation matters. The note should make it clear what was done beyond the usual pre-procedure assessment. If the visit was only for the procedure and the evaluation was minimal, bill the procedure alone. Overusing modifier 25 is a common audit trigger and a frequent cause of claim denials.

The diagnosis codes need to support medical necessity and tell the full story of the encounter. For a tick bite, coders typically use the code for a nonvenomous insect bite of the affected body site from the injury chapter, for example S80.861A for an insect bite of the right lower leg, initial encounter. The external cause code W57.XXXA (bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter) can be added to describe how the injury happened.

If the provider diagnoses a related condition, such as a local infection or Lyme disease (A69.20 for Lyme disease, unspecified), that diagnosis should also be coded. Be sure the seventh character reflects the encounter type, using A for the initial encounter and D for subsequent care.

Most errors with tick removal claims come from a short list of issues:

• Billing CPT 10120 for a simple removal with no incision documented.
• Appending modifier 25 to every E/M visit with a procedure, even when the evaluation was minimal.
• Missing the body site or laterality in the ICD-10 code.
• Billing follow-up wound checks that fall inside the 10-day global period.
• Using unlisted or unrelated procedure codes because the documentation is vague.

A short provider tip sheet and a claim scrubber rule that flags 10120 without incision language can prevent many of these problems. For practices that see a high volume of minor procedures, working with an experienced medical billing team helps keep coding consistent across providers and locations.