Rhode Island Gen Laws-Title 27-Chapter 27-20.9. Contract with Health Care Providers
Credentialing -- Insurers shall notify providers of initial credentialing within ten business days of approval by the insurer credentialing committee
Credentialing-Payment Issues
The health insurer shall reimburse the health care provider for covered services rendered by the health care provider to the health insurer’s subscribers or members following the first business day after the credentialing committee’s approval, provided that the health care provider returns a signed health care contract within fifteen (15) business days of receipt from the health insurer.
See http://webserver.rilin.state.ri.us/Statutes/TITLE27/27-20.9/INDEX.HTM