The fact you pay the bill would not preclude a malpractice suit and should be inadmissible, in the event it is allowed by the court, you can avert inferences by putting "paid in protest" in the ledger of the check. You may want to consult a medical malpractice attorney first they may be able to get the bill stayed, reduced or waived. You can find a qualified attorney on AVVO.
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You can still pursue a malpractice claim even if you don't pay your bill. Have a local malpractice lawyer order your medical records to review.
If you believe your therapist committed malpractice, why wait until they sue you over a bill. Be proactive. If you think you have a case, go to a local attorney who handles malpractice cases, and get his/her opinion. They will work on a contingency fee.
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