Z117 – Chemical and/or cryotherapy treatment of skin lesions
OHIP Psychiatric Code — INTEGUMENTARY SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
Chemical and/or cryotherapy treatment, one or more lesions. Note: 1. Z117 includes paring and/or debulking of a lesion prior to or subsequent to chemical and/or cryotherapy treatment, when rendered. 2. Z117 is limited to a maximum of one service per patient per physician per day. [Commentary: See Appendix D (8) of this Schedule for the conditions under which treatment of warts is an insured service.]
When to Use
- Use Z117 for the application of liquid nitrogen or chemical agents to treat benign skin lesions, such as actinic keratoses or seborrheic keratoses.
- Use Z117 for the treatment of warts only when they meet the specific clinical criteria outlined in Appendix D (8) of the Schedule of Benefits, such as causing functional impairment or pain.
Common Pitfalls
- Billing Z117 in addition to an office visit code (A007) for the same patient on the same day is generally disallowed unless the visit is for a distinctly separate, unrelated clinical issue.
- Attempting to bill Z117 multiple times for multiple lesions on the same day will result in rejection, as the code is limited to one service per patient per physician per day regardless of the number of lesions treated.
- Billing Z117 for cosmetic removal of skin tags or benign lesions that do not meet the medical necessity requirements defined in the Schedule of Benefits will lead to audit recovery.
Billing Tips
- Since Z117 includes the work of paring or debulking, do not attempt to bill a separate minor surgical procedure code for the preparation of the lesion.
- Ensure your clinical notes explicitly document the medical necessity of the treatment, particularly for warts, to satisfy the requirements of Appendix D (8) in the event of an audit.
Effective: April 1, 2026
M. Integumentary System Surgical Procedures
INTEGUMENTARY SYSTEM SURGICAL PROCEDURES
Surgical
Integumentary System Surgical Procedures
Appropriate medical records must be maintained to establish the service was provided, was medically necessary, and matches the submitted claim.
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