Commonwealth of Massachusetts Medical Assistance Program Provider Manual Series SUBCHAPTER NUMBER AND TITLE TABLE OF CONTENTS PAGE viii CHAPTER 766 MANUAL TRANSMITTAL LETTER 766-14 DATE 02/04/91 6. SERVICE CODES AND DESCRIPTIONS Definitions 6-1 Rate Provisions 6-3 Explanation of Abbreviation 6-4 Service Codes and Descriptions 6-4 Appendix A. ADDRESS DIRECTORY A-1 Appendix B. LOCAL WELFARE OFFICES B-1 Appendix C. THIRD-PARTY-LIABILITY CODES C-1