This field specifies the monthly the concatenated state/county Federal Information Processing Standard (FIPS) code for the beneficiary - in January.
The first 2 digits specify the state; the last 3 digits specify the county.
This variable is derived by taking the SSA state/county code on record for the beneficiary in the CMS enrollment database and linking it to the corresponding FIPS state/county code.
There are 12 monthly variables - where the 01 through 12 at the end of the variable name correspond with the month (e.g., 01 is January and 12 is December).
Source: CMS Common Medicare Environment (CME)
from the SSA code to the FIPS code)