Medical malpractice is negligence.  Negligence is the failure to exercise due care (that degree of care that a reasonable medical practitioner in the community would have exercised under the same or similar circumstances to prevent foreseeable harm).If the nurse practitioner is employed by the company or corporation you mentioned, then the company or corporation is liable for the negligence of its employee which occurred during the course and scope of employment.It would be advisable to contact the company's insurance carrier.  Your wife's claim filed with the company's insurance carrier should include her medical bills, medical report from the ER and if applicable documentation of any wage loss.Compensation for the medical bills is straight reimbursement.  The medical report will document the nature and extent of your wife's condition and will be used to determine compensation for pain and suffering, which is an amount in addition to the medical bills.  Compensation for wage loss is straight reimbursement.If the case is settled with the insurance carrier of the company employing the nurse practitioner, NO lawsuit is filed.  If your wife is dissatisfied with settlement offers from the insurance carrier, she should reject the settlement offers and file a lawsuit for negligence naming both the company and nurse practitioner as defendants.If the case is NOT settled with the company's insurance carrier,  your wife's lawsuit for negligence against the company and nurse practitioner must be filed prior to the expiration of the applicable statute of limitations or your wife will lose her rights forever in the matter.