I have always used Z77.011 and 83655. I have had some pay and some others not. If anyone know of better codes to use please share. Stephanie I use Z130 and 85018 for HGB. When billing regular medicaid use modifier TC with them if your billing managed medicaid or commercial then drop the modifier. thats what they told me to do and I get most of them paid but the lead test. they dont pay for it often from managed medicaid.