Can anyone help me with what e&m codes to use for the vets facility. The doctor i work goes to the vets facility 2-3 times a year. I am working on rejections from the previous biller.

Should i use the 99304 -99306 for the initial visit and 99307 - 99310 for established visits even though they might be 4-6 months apart.

Or should i use 99324-99328 for initial and 99334-99337 for established

thanks for any help