set_court_physician_effect

set_court_physician_effect = {
	$PHYSICIAN$ = {
		hidden_effect = {
			if = {
				limit = { 
					NOT = { liege = $EMPLOYER$ }
				}
				$EMPLOYER$ = { add_courtier = $PHYSICIAN$ }
			}
		}
	}
	$EMPLOYER$ = {
		#Replace existing court physician if one exists
		if = {
			limit = {
				employs_court_position = court_physician_court_position
				any_court_position_holder = {
					type = court_physician_court_position
					count > 0
				}
			}
			every_court_position_holder = {
				type = court_physician_court_position
				save_temporary_scope_as = old_physician

				$EMPLOYER$ = {
					replace_court_position = {
						recipient = $PHYSICIAN$
						holder = scope:old_physician
						court_position = court_physician_court_position
					}
					reverse_add_opinion = {
						target = scope:old_physician
						modifier = disappointed_opinion
						opinion = -15
					}
					reverse_add_opinion = {
						target = $PHYSICIAN$
						modifier = hired_me_opinion
					}
				}
			}
		}
		#Else just straight up appoint
		else = {
			appoint_court_position = {
				recipient = $PHYSICIAN$
				court_position = court_physician_court_position
			}
			reverse_add_opinion = {
				target = $PHYSICIAN$
				modifier = hired_me_opinion
			}
		}
	
		#Trigger treatments if needed
		hidden_effect = {
			if = {
				limit = {
					has_treatable_disease_trigger = yes
					has_recent_treatment_trigger = no
				}
				save_scope_as = sick_character
				trigger_event = {
					id = health.3101
					days = { physician_treatment_delay_ruler_min physician_treatment_delay_ruler_max }
				}
			}
			else_if = {
				limit = {
					has_recent_wound_treatment_trigger = no
					has_wounds_trigger = yes
				}
				save_scope_as = sick_character
				trigger_event = {
					id = health.4001
					days = { physician_treatment_delay_ruler_min physician_treatment_delay_ruler_max }
				}
			}
			every_courtier_or_guest = {
				if = {
					limit = {
						has_treatable_disease_trigger = yes
						has_recent_treatment_trigger = no
					}
					set_worst_disease_effect = yes
					save_scope_as = sick_character
					decide_who_picks_disease_treatment_effect = yes #Sends health.3101 to them or 3102 to liege (you)
				}
				else_if = {
					limit = {
						has_recent_wound_treatment_trigger = no
						has_wounds_trigger = yes
					}
					save_scope_as = sick_character
					decide_who_picks_wound_treatment_effect = yes
				}
			}
		}
	}
}

As written in game/common/scripted_effects/20_health_effects.txt.