Updated research request forms and data security approval requirement effective 4/24/23
This field specifies the zip code identified as the beneficiary mailing address.
In some cases, the code may not be the actual state where the beneficiary resides. CMS obtains the mailing address used for cash benefits or the mailing address used for other purposes (for example, premium billing) from Social Security Administration (SSA) and Railroad Retirement Board (RRB) Beneficiary Record Systems.
Source: CMS Common Medicare Environment (CME)