Hi David,
That would be I10, essential primary hypertension.
And I for one am hoping that is all we need on October 1, 2014. That's why I think we ought to know our most common diagnoses, and do the mapping ourself. Here's a tool that has the disclaimer that it isn't able to officially map from ICD 9 to ICD 10.
http://www.aapc.com/icd-10/codes/index.aspx?w=widget2&txtCode=401.9&txtType=9Here's a comparison for the old and new hypertension coding.
http://www.hcpro.com/content/233887.pdfNext October, I assume even Medicare will accept nonspecific diagnoses, since that is what we have been feeding their servers all this time.
Later, it will get a lot trickier. When they see an opthalmologist and get a diagnosis of H35.0, then you won't get paid for your I10. So it will take a while, but we will have to get more and more specific in our coding. That is if we want a clean claim that actually gets paid.