Wiki Billing with eliminated codes

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So, CMS eliminated K0554 and K0553 and went to permanent E and A codes for continuous glucose monitoring. I am working with some billing issues whereas payers still want to use the K codes but my billing service is saying it cannot due to HIPAA and I'm thinking it is b/c these K codes were eliminated from the code set? If a code is "officially" deleted from HCPCS level II, that means you cannot bill anyone using the codes because they are officially not part of the official code set under administrative simplification rules. Am I on the right track here? Any feedback is greatly appreciated!