Coding NCS 95903 with no "F wave" response

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Hello All-

Im looking for clarification regarding 95903 Nerve conduction, motor, with F wave study, particularly regarding how to bill if the "F wave" tested has no response. I haven't been able to find any current information, all I could find was an article from 2004 :confused:stating "if the F wave tested has no response reimbursement will be for CPT code 95900". Anyone have any insight on how to charge? Any/all suggestions welcome, Thanks!:)