RDMoore is right, but not only is it jeopardizing the contract with the insurance carrier it is against the law.
All of these concepts, deductible and co-insurance, are cost share obligations. The rules of managed care state that the patient CANNOT see the doctor until they make their co-payment. Managed care is governed by federal law and is not open to interpretation. To "write-off" a co-pay, or to allow a patient in to see the doctor without collecting the co-payment, is against the law.
Basically, providers are not supposed to 'forgive' patient responsibilities without proof of financial hardship.