An appointment flow is basically divided into 3 steps: collect data, analyse and provide treatment. If health provider and patient do not speak the same language, and a language interpreter is involved, the time of every step more than doubles and is the weakest link of the chain: anything translated incorrectly may impact the result of the treatment.
Now imagine a deaf person communicating via signs language in a foreign country, a sign language interpreter needs to be added to the equation, making the appointment time grow exponentially.