Medical coding vs Medica resresentative

I dont know much about it.
I talk to my room mate.

Following brief summary.
Medical representative are like sales man pitching sales to doctor for selling company medicines.
They have target to achieve.
it involve traveling, customer facing skills.

Medical coding.
Its related to insurance field.
Where customer have applied medical claim.
Which need to map to code for each disease.
Its does not customer facing skills.
But it also have targets, can be achieve by themselves.