10- 144 C.M.R. ch. 332, § 6-3
An individual who has been determined by the Disability Determination Services (DDS) to meet the disability criteria for receipt of SSI also meets the disability criteria for SSI - Related Medicaid benefits for the three months prior to application for SSI benefits. If there is an indication that the onset of the disability was between the first day of the third prior month and the application date eligibility begins with the first month of disability. Unless there is information to the contrary, the individual's statement of the onset may be accepted. If there is an indication that the individual was not disabled on the first day of the third month prior to the application for SSI, and if there is no information which would indicate the date of the onset of disability, then the procedures outlined in Section 4.3 of this Part must be followed. In determining retroactive Medicaid eligibility for all SSI recipients (aged, blind or disabled) all eligibility factors must be met. The best information available regarding income and assets should be used.
10- 144 C.M.R. ch. 332, § 6-3