You would code for the EGD w/bx - 43239. I'm assuming that's how the sample was obtained? And if the CLO is positive, use dx 537.89. If the CLO test is negative, use the dx that the patient presented for. Not sure if this is paid by Medicare. Anyone else? This test is done to identify H. pylori. The path results must say "positive for H. pylori" to use the h. pylori dx. It cannot just read "positive" (537.89). That's how I would do it.
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