Can someone help me by explaining the difference between these two codes:
87210 Smear, primary source with interpretation; wet mount for infectious agents (saline, india ink, KOH prep)
87220 Tissue examination by KOH slide of samples from skin, hair, or nails for fungi, ectoparasite ova or mites
These both mention KOH so I’m not sure which one to use. My best guess is that 87220 is only to be used for hair, skin or nail samples and 87210 to be used for any other source of sample (eg. vaginal). Is this correct?