I will assist as best I can, but on this question, I would appreciate input from others. I've read through Padget's handbook and did some Internet research. I've been coding pathology for 6 years, but I've not coded this specific situation.
Some questions to clarify - is the gross done as a requirement for adequacy before sending out and did this specimen come from an intraoperative consult? If the pathologist was present at the surgery to determine adequacy of the specimen, then 88329 would be used instead of 88300.
If this was not intraoperative, then the question remains whether 88300 can be charged when the specimen is received only for forwarding to another lab. If the gross examination and preparation of the specimen is an integral part of the subsequent analysis (88348), then additionally charging 88300 may not be appropriate. However, if the reference lab requires a gross examination of the specimen prior to their receiving the specimen, then 88300 would be appropriate.
I hope other also provide input.