S900 – Basic units for anaesthesia with any unlisted dental surgical procedure
OHIP Urology Code — DIGESTIVE SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
This fee code represents the basic units for an anaesthesia service rendered in conjunction with any unlisted dental surgical procedure performed by a dental or oral surgeon. The total anaesthetic fee is calculated by adding the 8 basic units to the applicable time units and multiplying the total by the anaesthesiologist unit fee. Refer to the General Preamble (, ) for detailed rules on calculating anaesthesia fees. Claims should be submitted with a 'C' suffix (e.g., S900C).
When to Use
- Use S900C when providing anaesthesia for dental or oral surgical procedures that do not have a specific anaesthesia unit value assigned in the Schedule of Benefits.
- Use S900C as the base unit code when the primary surgical procedure performed by the dental or oral surgeon is classified as an 'unlisted' or 'miscellaneous' procedure.
Common Pitfalls
- Do not use S900C if a specific anaesthesia unit value is already defined for the dental procedure; always verify if the surgical code has a designated 'Anae' column value first.
- Failure to document exact start and finish times in the patient record is a common audit trigger, as these are required to calculate the total time units added to the 8 basic units.
- Submitting S900C without the 'C' suffix will result in an automatic rejection, as the suffix is mandatory for all anaesthesia claims.
Billing Tips
- Ensure the total anaesthesia fee is calculated as (8 basic units + total time units) multiplied by the current anaesthesiologist unit fee, then apply any applicable E-code modifiers or after-hours premiums.
Effective: April 1, 2025
S. Digestive System Surgical Procedures
DIGESTIVE SYSTEM SURGICAL PROCEDURES
Surgical
Anaesthesiologists' Services
A pre-anaesthetic evaluation and post-anaesthetic follow-up are included elements of the service and should be documented.
The anaesthesiologist must indicate his/her starting and finishing times as part of the medical record, particularly if a replacement anaesthesiologist is involved.
(see General Preamble , also Bulletin #4203)
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