He may have been a specialist scientist of some kind, who holds a doctorate. Not necessarily a GP or having the broad skills to be a CMO. Wiki describes him as "a Starfleet scientist, specializing in xenology and exobiology".
I never got the feeling from Geordi's examination discussions with Crusher or Pulaski about his eyes that his father was a medical GP who'd already explored all the options.
Although she wore red, wasn't there also "Dr Anne Mulhall" in TOS? Not a GP, but holding a doctorate. So wearing blue wouldn't mean "definitely medical doctor".
I never got the feeling from Geordi's examination discussions with Crusher or Pulaski about his eyes that his father was a medical GP who'd already explored all the options.
Although she wore red, wasn't there also "Dr Anne Mulhall" in TOS? Not a GP, but holding a doctorate. So wearing blue wouldn't mean "definitely medical doctor".