The time frame of 6 months is not the issue. If the patient is still under observation/follow-up care for the original fracture and surgical treatment, then the Acute Fracture Diagnosis S Code remains in place, and only the 7th Character changes depending on the healing process. Your query indicates that the fracture hasn't completely healed, which would mean it is either a "Delayed Healing" or "Nonunion" situation. Assuming the original fracture was closed, the 7th Character would be D for normal/routine healing, G for delayed healing, or K for nonunion. Your physician is going to have to "make the call" as to whether it is "Delayed Healing" or "Nonunion" in order to assign the correct one. Unless there is some other complication of treatment not identified in your note, 7th Character S does not apply. The 7th Character for "abnormal healing" remains in place until treatment is complete and the patient discharged from care, even if additional surgical treatment to the abnormally healing fracture is rendered. I refer you to icd10orthocoder.com where I have a Blog regarding 7th Characters, integrated with the Gustilo Classification of open fractures. Click on the Blogs Tab, scroll through the list of Blogs, then click on the Blog for 7th Characters and the full Blog will open up.
As for Z Codes, these Codes are "Reasons for Encounters," and are not in and of themselves
Diagnosis Codes. Also, they are not meant for use for fracture aftercare while the fracture care/follow-up/observation is still in progress. Once the patient has healed and recovered to the best possible level of recovery, and has been discharged from further care and follow-up, the Z09 (Encounter for Follow-up Examination
after completed treatment for a condition
other than malignant neoplasm) could be applied if the patient returns for some reason, possibly with questions and/or concerns about their previous injury, but without necessarily having any new symptoms or complaints. There is a Coding Note/Directive:
Use additional code to identify any applicable "History of" disease code for Z09. In the case of a
healed traumatic fracture, this would be Z87.81.
Hopefully this helps clarify this issue for you.
Respectfully submitted, Alan Pechacek, M.D.