Commonwealth of Massachusetts MassHealth Provider Manual Series Oxygen and Respiratory Therapy Equipment Manual Subchapter Number and Title Table of Contents Transmittal Letter OXY-30 Page vi Date 01/01/11 6. Service Codes 601 Introduction 6-1 602 Service Codes 6-1 Appendix A. Directory A-1 Appendix B. Enrollment Centers B-1 Appendix C. Third-Party-Liability Codes C-1 Appendix W. EPSDT Services: Medical and Dental Protocols and Periodicity Schedules W-1 Appendix X. Family Assistance Copayments and Deductibles X-1 Appendix Y. EVS Codes/Messages Y-1 Appendix Z. EPSDT/PPHSD Screening Services Codes Z-1