CPT® Code 17110

Key Takeaways for CPT 17110

• Definition: Destruction of 1 to 14 benign skin lesions (e.g., warts, seborrheic keratoses) in a single session.
• Methods: Includes cryosurgery, electrosurgery, laser, chemical destruction, or curettement.
• Billing Rule: Bill 1 Unit per session regardless of lesion count (up to 14). Never bill with 17111.
• Coverage: Requires medical necessity (symptoms like pain/bleeding). Cosmetic removal is not covered.

CPT 17110 is the specific medical billing code for the destruction of up to 14 benign skin lesions. Unlike excision (cutting), this code covers destruction methods such as freezing (cryotherapy) or burning (electrocautery). It is a "session-based" code, meaning reimbursement is fixed for the encounter whether the provider treats one single wart or fourteen separate lesions.

Proper use of CPT 17110 is critical for dermatology and primary care billing, particularly in distinguishing it from the "high volume" code 17111 and avoiding bundling errors with E/M services.

1. Understanding CPT 17110 Scope

CPT 17110 falls under the "Destruction, Benign or Premalignant Lesions" category. The official descriptor limits this code to benign lesions only (excluding skin tags) and caps the quantity at 14.

Included Methods

The code describes the destruction of tissue, not the excision. Common modalities include:

• Cryosurgery: Applying liquid nitrogen to freeze the lesion.
• Electrosurgery: Using electric current (cautery) to destroy tissue.
• Chemosurgery: Application of chemical agents (e.g., cantharidin).
• Laser Ablation: Vaporizing the lesion (non-vascular).

The "Session" Rule

This is the most common point of confusion. CPT 17110 is not billed per lesion.

• If you treat 1 lesion: Bill 17110 (1 unit).
• If you treat 10 lesions: Bill 17110 (1 unit).
• If you treat 14 lesions: Bill 17110 (1 unit).

2. Medical Necessity and Exclusions

Insurers, including Medicare, do not pay for the removal of benign lesions for cosmetic reasons (e.g., the patient just dislikes the appearance). To justify reimbursement, the medical record must document symptoms or risks.

Indications for Coverage

• Symptoms: Pain, tenderness, intense itching (pruritus), or bleeding.
• Trauma: The lesion is chronically irritated by clothing (bra straps, waistbands) or jewelry.
• Infection: The lesion is inflamed or viral (e.g., warts) with the potential to spread.
• Functional: The lesion obstructs a body orifice or vision.

Common Exclusions (What NOT to Bill)

• Skin Tags: Use CPT 11200 (removal of up to 15 tags).
• Premalignant Lesions: Actinic Keratoses (AKs) must be billed with 17000-17004.
• Vascular Lesions: Port-wine stains or hemangiomas use 17106-17108.

3. Comparison Table: Lesion Destruction Codes

Selecting the correct code depends entirely on the lesion type and the total count.

Billing Alert: CPT 17110 and 17111 are mutually exclusive. Never bill them together for the same patient on the same day. If you treat 20 lesions, bill only 17111 (which covers 15+), not both.

4. Documentation Requirements

To support the billing of 17110 and prevent audit take-backs, the procedure note must be specific:

• Exact Count: "Destruction of 8 verruca vulgaris..." (Essential to prove 17110 vs 17111).
• Location: Specific anatomical site (e.g., "left plantar foot," "right neck").
• Method: "Lesions were destroyed using liquid nitrogen cryotherapy, two freeze-thaw cycles."
• Medical Necessity: Explicit statement of symptoms (e.g., "Lesions are painful upon walking and bleeding intermittently").
• Diagnosis Link: Link the code to a benign diagnosis (e.g., B07.9 Viral Wart), not a malignant or cosmetic one.

5. Billing Tips, Modifiers and Global Period

Global Period (10 Days)

CPT 17110 is a "minor procedure" with a 10-day global period.

• Routine follow-up care for the treated lesions within 10 days is included in the payment and cannot be billed separately.
• Do not use modifier 57 (Decision for Surgery); that is only for major (90-day) surgeries.

Significant E/M (Modifier 25)

An Evaluation and Management (E/M) code (e.g., 99213) is generally not billable on the same day as 17110 unless a distinct, unrelated condition was treated.

• If the visit was only to look at the warts and freeze them, bill only 17110.
• If the provider also managed the patient's acne or hypertension, bill the E/M with modifier 25: 99213-25 and 17110.

Distinct Procedures (Modifier 59)

If you destroy benign lesions (17110) AND premalignant lesions (17000) in the same visit, you may need modifier 59 (or XS) on the 17110 code to show they are separate services for separate lesions.

• Example: "Cryotherapy of 3 AKs on face (17000, 17003 x2) and 5 SKs on back (17110-59)".

flowchart TD
    A[Patient presents with skin lesions for destruction] --> B{Lesion type?}
    B -->|Benign: warts, SKs| C{How many lesions?}
    B -->|Premalignant: AKs| D[Use 17000 + 17003]
    B -->|Skin Tags| E[Use 11200]
    B -->|Vascular| F[Use 17106-17108]
    C -->|1 to 14| G[Bill CPT 17110 x1]
    C -->|15 or more| H[Bill CPT 17111 x1]
    G --> I{Separate E/M service?}
    H --> I
    I -->|Yes, distinct condition| J[Add E/M with Modifier 25]
    I -->|No| K[Bill destruction code only]
    G --> L{Also treating premalignant lesions?}
    L -->|Yes| M[Add Modifier 59 to 17110]
    L -->|No| N[No modifier needed]

Conclusion

CPT 17110 is the standard for treating low-volume (1-14) benign skin lesions. Accurate billing relies on exact lesion counting, strict adherence to the "one unit per session" rule, and robust documentation of medical necessity to differentiate the service from cosmetic procedures. By following the 2026 guidelines, practices can ensure compliance and proper reimbursement.