This code system http://terminology.hl7.org/CodeSystem/appointment-cancellation-reason defines many codes, of which the following are some examples:
\n \n \n \n \n \n Lvl\n \n | \n \n \n \n Code\n \n | \n \n \n \n Display\n \n | \n \n \n \n Definition\n \n | \n \n
\n \n \n \n 1 | \n \n pat\n \n \n \n | \n \n Patient | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-crs\n \n \n \n | \n \n Patient: Canceled via automated reminder system | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-cpp\n \n \n \n | \n \n Patient: Canceled via Patient Portal | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-dec\n \n \n \n | \n \n Patient: Deceased | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-fb\n \n \n \n | \n \n Patient: Feeling Better | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-lt\n \n \n \n | \n \n Patient: Lack of Transportation | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-mt\n \n \n \n | \n \n Patient: Member Terminated | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-mv\n \n \n \n | \n \n Patient: Moved | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-preg\n \n \n \n | \n \n Patient: Pregnant | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-swl\n \n \n \n | \n \n Patient: Scheduled from Wait List | \n \n | \n \n
\n \n \n \n 2 | \n \n pat-ucp\n \n \n \n | \n \n Patient: Unhappy/Changed Provider | \n \n | \n \n
\n \n \n \n 1 | \n \n prov\n \n \n \n | \n \n Provider | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-pers\n \n \n \n | \n \n Provider: Personal | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-dch\n \n \n \n | \n \n Provider: Discharged | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-edu\n \n \n \n | \n \n Provider: Edu/Meeting | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-hosp\n \n \n \n | \n \n Provider: Hospitalized | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-labs\n \n \n \n | \n \n Provider: Labs Out of Acceptable Range | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-mri\n \n \n \n | \n \n Provider: MRI Screening Form Marked Do Not Proceed | \n \n | \n \n
\n \n \n \n 2 | \n \n prov-onc\n \n \n \n | \n \n Provider: Oncology Treatment Plan Changes | \n \n | \n \n
\n \n \n \n 1 | \n \n maint\n \n \n \n | \n \n Equipment Maintenance/Repair | \n \n | \n \n
\n \n \n \n 1 | \n \n meds-inc\n \n \n \n | \n \n Prep/Med Incomplete | \n \n | \n \n
\n \n \n \n 1 | \n \n other\n \n \n \n | \n \n Other | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-cms\n \n \n \n | \n \n Other: CMS Therapy Cap Service Not Authorized | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-err\n \n \n \n | \n \n Other: Error | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-fin\n \n \n \n | \n \n Other: Financial | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-iv\n \n \n \n | \n \n Other: Improper IV Access/Infiltrate IV | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-int\n \n \n \n | \n \n Other: No Interpreter Available | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-mu\n \n \n \n | \n \n Other: Prep/Med/Results Unavailable | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-room\n \n \n \n | \n \n Other: Room/Resource Maintenance | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-oerr\n \n \n \n | \n \n Other: Schedule Order Error | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-swie\n \n \n \n | \n \n Other: Silent Walk In Error | \n \n | \n \n
\n \n \n \n 2 | \n \n oth-weath\n \n \n \n | \n \n Other: Weather | \n \n | \n \n
\n \n