_Value—How Proved._—When the medical man is compelled to go into court to enforce payment for his services, it has been questioned whether he can testify to the services rendered, and the facts and circumstances surrounding the patient at the time of the treatment, because it has been claimed that he could not do so without violating the statute against the disclosure by physicians of information received which is necessary to enable them to prescribe. The tendency of the later decisions, however, seems to be that the breach of the patient’s contract to pay relieves the physician from his obligation of secrecy, and consequently, that if it is necessary for him to go into court and prove the value of his services, he may testify, within reasonable limitations, to all matters necessary to inform the court fully as to the nature and extent of the disease or injuries of the patient, in order that he may show the responsibility imposed upon him and the extent of the services that he has rendered. This subject will be fully considered under the head of “Privileged Communications.” The usual course of practice where there is not an express contract fixing the charges, is to prove the facts and circumstances showing the treatment and services, and then to produce other physicians who, in answer to a hypothetical question stating the facts and circumstances in the case, assuming them as true, are allowed, if they state they know the value of such services, to give an expert opinion as to what that value is.[176] It has also been said (Ordronaux, “Jurisprudence of Medicine,” § 43), that if a fee-bill of charges for such services has been established by an association of physicians recognized by law, such as a county medical society or a State medical society, incorporated pursuant to statute, such fee-bill can, if properly authenticated as having been adopted by the association, be offered in evidence on behalf of the patient and against the physician. But such a fee-bill in such a case would not be held to be conclusive evidence of the value of the services, but will be received in evidence, if at all, merely for the purpose of showing what was the usual and ordinary charge in such cases. As we shall see later on, under “Malpractice,” a judgment for services rendered, however small, is a bar to an action of malpractice, because a judgment for the value of the services rendered involves proof on the part of the plaintiff, and a finding on the part of the court, that the services had value and were skilfully performed and properly rendered.[177] _Custom of Physicians to Treat Each Other Gratis, Enforceable._—Physicians frequently treat each other, and it has been held, where the custom exists to do so without charge, that such a custom is binding. Of course, this rule does not prevent physicians from making an express contract to waive the custom and agreeing that the services be compensated.