The mass.gov web site has PDFs of a list of MassHealth Provider regulations available and accessible to you for your reference. Find them HERE. You can also sign up to receive email notification of updates to MassHealth provider manuals, regulations, and bulletins.
If you are missing any of these publications, you can contact MassHealth directly to obtain them, as below.
PO Box 9118
Hingham, MA 02043Fax 617-988-8973