If you have a copay with your primary insurance but also have secondary insurance do you have to pay the copay before treatment?

Yes, and you want them to because if they are paid out of order then it will be a mess to correct.

Often, a person will have "primary" insurance and "secondary" insurance. For example, if you have insurance through your job, and your husband has insurance through his job, then your primary insurance will be the one through your job, and your secondary insurance will be the one through your husband's job. Also, your husband's insurance through his job will be his primary, and yours through your job will be his secondary. There can be some exceptions to this though. For example, if you were married, had a child, then divorced and remarried (retaining custody of the child), and both your ex and current husbands have insurance through work, then the one who's birthday is first is considered the "primary" insurance, and the other is the "secondary" insurance. But there will still be a deductible with each one that has to be met before either one will pay.

Secondary simply means not primary. That is, primary comes before secondary.

Yes. A secondary beneficiary only becomes beneficiary if the primary beneficiary dies before the insured. Say the insured and primary beneficiary are involved in a fatal auto accident but the insured dies an hour before the primary beneficiary. The insurance proceeds would not go to the secondary beneficiary but to the estate of the primary beneficiary. If the primary beneficiary dies an hour before the insured then the secondary beneficiary receives the proceeds. If an insured wants both to receive monies they can name more than one person as primary beneficiary and in what percentage for each person. They could also leave it to their estate and handle distribution by a will.

Yes. Your doctor is not required to file to your secondary insurance.