If affiliation or participation between a primary care physician and an insurer terminates, the physician may provide written notice of this termination within 15 days after the physician becomes aware of the termination to each insured who has chosen the physician as his or her primary care physician. If an insured is in an ongoing course of treatment with any other physician that is affiliated or participating with the insurer and the affiliation or participation between the physician and the insurer terminates, the physician may provide written notice of this termination to the insured within 15 days after the physician becomes aware of the termination.