A metal fragment was removed from his eye, but the metal in his thigh was left there as it was unlikely to cause issues.
The incident also caused damage to his flat, which his landlord had to repair.
The terrorist later told police he was concerned the shot might have been heard and reported to police, and he came up with a scenario of what he would tell them if they questioned him.
He also weighed up whether to seek treatement, as he was worried about attracting official attention.
The Royal Commission of Inquiry into the terror attacks has recommended making the reporting of gunshot wounds mandatory.
Southern District Health Board chief executive Chris Fleming said in a statement the mosque attacks were a horrendous tragedy that society must learn from, but it was impossible for clinicians to predict the outcomes.
While living in Dunedin, the terrorist also needed medical treatment due to his use of steroids.
In December 2017, he was treated by a doctor at the Dunedin South Medical Centre for abdominal pain near his liver.
He told the doctor he had been taking non-prescribed oral steroids, and was also injecting himself with testosterone two to three times a week.
The doctor later told police the terrorist was using testosterone at what was likely a dangerous level.
Police have been unable to work out where the terrorist was sourcing his drugs from, and none were found in his flat or car.
He also bought 500 hypodermic needles, 300 syringes and 200 alcohol swabs in February 2018.
