"Health care provider" means:

(1) A physician or an osteopathic physician who is licensed to practice medicine or surgery, as appropriate, by the state in which the physician practices;

(2) Nurse practitioners, nurse-midwives, midwives, clinical social workers, physician assistants, podiatrists, dentists, clinical psychologists, optometrists, and physical therapists licensed to practice under state law and who are performing within the scope of their practice as defined under state law by the state in which they practice; 

(3) A health care provider listed above who practices in a country other than the United States, who is authorized to practice in accordance with the law of that country, and who is performing within the scope of the health care provider's practice as defined under such law; or

(4) Any other provider permitted to certify the existence of a serious health condition under the federal Family and Medical Leave Act of 1993 (Act Feb. 5, 1993, P.L. 103-3, 107 Stat. 6, as it existed on October 19, 2017).