Appendix B in the SSI protocol [PDF – 586 KB] provides clarity and support for Denominator Reporting Instruction #6 (which addresses the same NHSN operative procedure category performed via separate incisions). Appendix B provides guidance on correct procedure reporting when multiple procedures of the same category are performed per patient per calendar day via separate incisions (with an explanation for each of the 12 procedure categories found within this instruction). Denominator Reporting Instruction #6 is found on page 9-25 of the SSI protocol [PDF – 586 KB] and Appendix B begins on page 9-40 of the SSI protocol [PDF – 586 KB].