The M3 is code used to check admissible on medical grounds. M3 code is fine. see link belowmrihan said:Hello Everyone,
My brother applied for my parents and myself as a dependant in Sep 2010. We had our medical done in May 2015. We still have not received a passport request. We ordered the GCMS notes and it showed my dad (principal app) has a heart condition M3. It also said interview recommend. The GCMS note stated that they sent out a letter in june2015 but we have not received anything. Do you guys know how long is the interview queu or will it be waived?
http://www.cic.gc.ca/english/resources/tools/medic/assess/index.asp
I don't know how long interview queue is, which visa office is your application at as some are quicker than others.