Mass. Gen. Laws ch. 176O, § 29
(i) use and accept only the credentialing forms designated by the commissioner; and (ii) review a submitted credentialing form for a health care provider and respond to the health care provider not more than 20 business days after receiving a completed credentialing request.
Nothing in this section shall prohibit a carrier, or any entity that manages or administers benefits for a carrier, from using a credentialing methodology that utilizes an internet webpage, internet webpage portal or similar electronic, internet and web-based system in lieu of a paper form; provided, however, that upon request, a carrier, or any entity that manages or administers benefits for a carrier, shall make a paper credentialing form available to a health care provider.