The nursing note of the consultation states that he was advised to contact the clinic by the end of the week if he had not heard anything from the surgeon.
The man, however, recalls being instructed to wait for further advice.
The lab report, which arrived a day after the sutures-removal consultation, diagnosed basal cell carcinoma, a type of skin cancer.
The commissioner's office said: "Despite the man requiring follow-up he was not informed of the histology results and no follow-up was arranged."
More than a year later the man, seeking travel vaccinations, saw a GP who noted three areas suspicious for basal cell carcinoma on his scalp.
The GP sought the lab report and a week later met the patient again and told him of its cancer diagnosis. He referred the man to a skin specialist for surgery.
The plastic surgeon does not remember how the error in not informing the patient of his test results occurred, but said it was likely he signed off the test result remotely and either did not print the report or it was printed but mis-filed.
He accepted he signed off the lab report but did not take further action.
Mr Hill said that by failing to inform the man of his abnormal test results the surgeon breached the code.
The commissioner found that the lack of safeguards in the clinic's systems contributed to the man receiving sub-optimal care.
Mr Hill asked the clinic to audit records of patients with abnormal test results back to August 2012 to ensure they have been informed and if necessary had appropriate follow-up organised.
The surgeon has apologised in writing to the patient and Mr Hill asked the clinic to do likewise.