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The unnamed doctor is a black market doctor whose job is to treat wounds and injuries for hitmen, criminals, and assassins. He appears in John Wick: Chapter 3 - Parabellum and played by Randall Duk Kim who played the Key maker in the Matrix.
The doctor seems to have a high amount of respect for Wick in which after the excommunicado was initiated, he told John Wick to injure him with gunshot wounds to exempt himself from being punished by the High Table for treating Wick's injuries as well as giving him medical supplies.