All X12N Implementation Guides adopted for use under HIPAA and their corresponding addenda are available in three configurations: downloadable PDFs, PDFs shipped on CD, and bound books.
The following article is an introductory look at version 5010 of the ASC X12 Health Care Claim Payment/Advice Transaction as implemented in Technical Report Type 3 # X221 and how it differs from the 4010 version implemented under HIPAA (X091/X091A1).