Guidelines says for fracture and injuries use S code with D(subs encounter) no Z code
section 1.c. 19. a
Application of 7th Characters
7th character “D” subsequent encounter is used for encounters after the patient has received active treatment of the condition and is receiving routine care for the condition during the healing or recovery phase. Examples of subsequent care are: cast change or removal, an x-ray to ICD-10-CM
check healing status of fracture, removal of external or internal fixation device, medication adjustment, other aftercare and follow up visits following treatment of the injury or condition.
"The aftercare Z codes should not be used for aftercare for conditions such as injuries or poisonings, where 7th characters are provided to identify subsequent care. For example, for aftercare of an injury, assign the acute injury code with the 7th character “D” (subsequent encounter)".
section 1.c.19.c.1
Coding of Traumatic Fractures
Fractures are coded using the appropriate 7th character for subsequent care for encounters after the patient has completed active treatment of the fracture and is receiving routine care for the fracture during the healing or recovery phase. Examples of fracture aftercare are: cast change or removal, an x-ray to check healing status of fracture, removal of external or internal fixation device, medication adjustment, and follow-up visits following fracture treatment.
Hope this helps I haven't coded a scenario, just cleared the certification. So not sure how much my reply can be helpful.