La. Stat. tit. 17 § 1519.17
Each licensed physician serving on the staff of any of the Louisiana State University Health Sciences Center medical centers and his full-time supervisory medical staff member, by joint signature, are hereby required, when requested by a social security claimant who is, or who has been, a patient of the physician at such medical center and who has a treating relationship with the patient in the appropriate field and sufficient knowledge to render an opinion, to provide descriptive statements and opinions for the patient with respect to the patient's medical condition, employability, and ability to function, upon which disability determinations may be based. Nothing in this Section shall prohibit a medical center from requiring payment for the medical center's current evaluation and management level services, but no such service shall be denied due to a patient's inability to pay. Nothing in this Section shall prohibit Social Security Administration funding from being used to pay for such services.
La. R.S. § 17:1519.17