Make an appointment first.
They have morning walk ins at their mobile truck on Wednesdays in front of the Daily Bread. Call them for more info about this. I have heard that the line can be long, and to arrive very early. For a post op hospital follow up, it took nearly 3 months to get an appointment at the Sarno office. If you havent registered with BHA and have an urgent need, I suggest going elsewhere or maybe trying the mobile truck.
You're better off making an appointment.
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