For patients receiving therapeutic services only during an outpatient encounter (except chemotherapy or radiation therapy), sequence first the diagnosis, condition, problem, or other reason for encounter that is __________

a. chiefly responsible for the outpatient services provided during the encounter
b. documented as also affecting patient care, treatment, and medical management
c. established as the reason for inpatient admission to the health care facility
d. qualified by the primary care provider as possible, probable, or suspected

a