Texas Health Maintenance Organization Act
INSURANCE CODE CHAPTER 843.
http://www.statutes.legis.state.tx.us/Docs/IN/htm/IN.843.htm

Preferred Provider Benefit Plans
INSURANCE CODE CHAPTER 1301.
http://www.statutes.legis.state.tx.us/Docs/IN/htm/IN.1301.htm

Companies that have approved forms utilizing PPO contract.

SILENT PPOs.
Texas Department of Insurance
http://www.tdi.state.tx.us/wc/wcnet/documents/wcwg501ja.pps 

Introduction and Overview Transition to Healthcare EDI
Aug 20, 2001, Gary Beatty
Washington Publishing Company
http://www.ehcca.com/presentations/ehc-info3/beatty1.pdf

The Basics of Healthcare EDI/EC
March 14, 2002. Jim Moynihan
McLure-Moynihan Inc. Agoura Hills, CA
http://www.ehcca.com/presentations/HIPAAWest2/1_01.pdf