can you code Hepatits B as chronic from the PMH

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I am a risk adjustment coder and am presently auditing the chart reviews of one of our vendors. Hepatitis B is in the current diagnosis list and consistently being mentioned in the note so I have no problem with Hep B being coded as B19.10, they are stating that since Hepatitis B is also listed in the PMH that it is ok to code as Chronic Hepatitis B B18.1. I was always taught that you can not add words to the diagnosis that you can only code what is written. Any thoughts on this? B19.20 is not mapped to HCC but B18.1 is and I feel like this is up coding.