Leave Manual
Section 2.4 Medical or Dental Treatment While on Leave
2.4.01 Medical or Dental Treatment on Leave
When medical or dental treatment is required during a period of leave, a member of the Regular or Reserve Force authorized under QR&O 34.07, Entitlement to Medical Care, and QR&O 35.04, Entitlement to Dental Treatment, should report to the nearest CF medical or dental facility. If this is impractical, the procedure to be followed in obtaining and accounting for "emergency" medical or dental treatment is specified on the member's copy of the CF 100 leave request/authorization form.
When a member on leave is admitted to hospital, leave shall terminate on the day prior to the date of admission.
The purpose of sick leave is to supplement the medical treatment provided to CF members. It is granted for that period of time during which a member is unfit for duty but is not required to convalesce in an infirmary or hospital. IAW QR & O Vol 1, 16.16, Leave, “An officer or non-commissioned member may be granted sick leave not exceeding two continuous calendar days by their commanding officer without the recommendation of a medical officer. All sick leave beyond an initial two-day period will be approved by the General Duty Medical Officer or the CF Primary Care Physician to a maximum period of 14 continuous calendar Days.
Ergo - There is no issue with someone receiving medical treatment while on leave (even post-deployment) unless they become hospitalized, then they can seek reimbursement/cancelation of leave. If they are unfit for duty or in this case unfit for leave then they should be on sick leave.
Guidance for health care providers on Sick Leave and Annual Leave is found at: http://hr.ottawa-hull.mil.ca/health-sante/pd/pol/word/5020-72-eng.doc