Why did they rename hepatitis c?

They did? What's the "New name?"

Who renamed Hep C? I have been exposed to both B & C, and to date know that there was already a Hepatitus H or more.
These are various strains of hepatitus. Just because you may test positive, does NOT mean you necessarily have it--Like HIV, it simly means that the test shows exposure to the virus. The labs can do a test to see if and how active Hepatitus is in your system and identify what strains you are positive for. I'm sure that I got exposed working in a hospital for a number of years, but to date am not showing active or having any signs or symptoms. You may be confusing the various named strains since they all have a letter after Hepatitus (i.e. Hep A,B,C,D,E,F...) so be sure to check with your local health department or health care provider if you think you have the active virus. Good Luck and Be Well.
This is the second time you've asked this same question. Hep C wasn't renamed. Not in 1989, not in 1990, not at any time. It was discovered in 1989 and is thought to have been responsible for non-hep A & B viral infections.
I'm a nurse.
I don't know that the renamed it so much as named it. It used to be called "non-A non-B hepatitis" so now that we have up to Hepatitis H, and that would no longer be a particularly useful way to refer to it, it has it's very own name