Commonwealth of Massachusetts MassHealth Provider Manual Series Subchapter Number and Title Table of Contents Page vi Hearing Instrument Specialist Manual Transmittal Letter HIS-24 Date 03/15/09 6. Service Codes and Descriptions Introduction ................................................................................................................................ 6-1 Service Codes and Descriptions .................................................................................................. 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 Protocol and Periodicity Schedule..................................... W-1 Appendix X. Family Assistance Copayments and Deductibles........................................................... X-1 Appendix Y. REVS Codes/Messages................................................................................................. Y-1 Appendix Z. EPSDT/PPHSD Screening Services Codes.................................................................. Z-1