u/Ok-google07

The provider I work for is wanting to use B20 for a new patient who has HIV and came about a new rash that appeared. The provider sent out a referral and did lab work and prescribed a cream. No other prior illness or conditions were discussed. She told me she "thinks" that the rash is due to his condition. I am wanting to use Z21 since it is still not confirmed and she said she "thinks" . Please any more information would help. Online resources are basically saying the same thing over and over again. Also if Z21 should be used can someone please help me out on how I should respond to her to change it ? She is one of those providers that fights tooth and nail about changing a code. Thank you in advance everyone.