Question: Answer: 1. If you're using an archived specimen (one that's been in storage more than 30 days), you should use the date the specimen is taken from storage as the DOS. 2. If you're using a stored specimen (one that's been in storage at least 14 days but not more than 30 days), you should use the date you perform the service. Follow this rule only if you meet these criteria: Medicare doesn't give instruction concerning DOS for professional-only pathology services (such as 88321, Consultation and report on referred slides prepared elsewhere, and 88325, Consultation, comprehensive, with review of records and specimens, with report on referred material, which don't have a TC on the fee schedule), but most pathology practices follow the same guidelines for consistency. Non- Medicare payers may have different guidelines, and you should follow your payers' instructions. Most of your outside consult requests will probably involve archived specimens, so you'll probably report the DOS as the date the specimen is taken from storage, in most cases.