I am still working and 70 years old. From what i understand, it is rare to have an employee on Medicare Part A & B and with the COBRA continuation insurance. When I get the various paperworks for services provided to me, who do I forward them to?

In regards to COBRA and Medicare, Medicare is the primary claim payer if your entitlement is due to disability; or,
your entitlement is due to age and you are not actively employed by the employer
providing the health coverage.

So COBRA would be the primary payer.

http://www.cobrahealth.com/Dependents-E ... icare.html

An eligible individual is entitled to Medicare Part A if they have attained age 65 and files the appropriate application, if necessary. Entitlement based on age begins on the 1st of the month in which the individual has met the requirement for medicare. If the individual applies for Social Security income benefits before their 65th birthday, the entitlement date is the 1st of the month that they turn 65.