My friends doctor refuses to see her anymore but will not give her her medicle papers to see a new doctor. Does he have a right to do that?

Please. My friend has been in and out of hospitals for a year now because of a very bad pain in her stomach. Her doctor since she was a baby is now refuseing to even see her anymore but will not give them the papaers of her medicle history or anything. Does her parents have a right to sue the doctor?
My friends doctor refuses to see her anymore but will not give her her medicle papers to see a new doctor. Does he have a right to do that?
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