20 CFR 10.300 – You Have a Right to a CA-16 – (a) When an employee sustains a work-related traumatic injury that requires medical examination, medical treatment, or both, the employer shall authorize such examination and/or treatment by issuing a Form CA-16. This form may be used for occupational disease or illness only if the employer has obtained prior permission from OWCP…

20 CFR 10.300 (d) – The employer should advise the employee of the right to his or her initial choice of physician. The employer shall allow the employee to select a qualified physician, after advising him or her of those physicians excluded under subpart I of this part…

CA-810 – Supervisors Can Not Interfere with the Employee’s Choice of Physician -A. Initial Choice. An employee is entitled to initial choice of physician for treatment of an injury. He or she may choose any licensed physician in private practice who is not excluded, or he or she may choose…