Z105 – Abscess or haematoma - General anaesthetic - perianal
OHIP Psychiatric Code — INTEGUMENTARY SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
This fee code corresponds to the surgical procedure 'Abscess or haematoma - General anaesthetic - perianal' as listed under 'M. Integumentary System Surgical Procedures' on page . As a 'Z' prefix code, it is classified as a surgical/procedural service per . The fee is subject to general rules for surgical procedures, including eligibility for anaesthesia and surgical assistant fees as defined in the General Preamble.
When to Use
- Use Z105 when performing an incision and drainage of a perianal abscess or hematoma specifically under general anaesthetic.
- Select Z105 instead of minor procedure codes like Z102 or Z172 when the complexity of the perianal location necessitates general anaesthesia.
Common Pitfalls
- Billing Z105 alongside an office visit code (A007) is generally disallowed as the visit is considered included in the surgical procedure fee.
- Failing to append the E515 premium when the procedure is performed as the sole procedure in an operating room results in a significant loss of billable value.
Billing Tips
- Always verify if the procedure qualifies for the E515 110% add-on to maximize the claim value when performed in an operating room setting.
Effective: April 1, 2026
M. Integumentary System Surgical Procedures
INTEGUMENTARY SYSTEM SURGICAL PROCEDURES
Surgical
Musculoskeletal System Surgical Procedures
The medical record must establish that: 1. an insured service was provided; 2. the service for which the account is submitted is the service that was rendered; and 3. the service was medically necessary.
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