The X12 Procedures Review Board.
X12F
A subcommittee of X12 that defines EDI standards for the financial industry. This group maintains the X12 811 [generic] Invoice and the X12 820 [generic] Payment & Remittance Advice transactions, although X12N maintains the associated HIPAA Implementation Guides.
X12J
A subcommittee of X12 that reviews X12 work products for compliance with the X12 design rules.