Indicator representing the iteration of the file.
A version number where the value 01 is assigned to the original monthly file, and the version number is increased by one for each subsequent month in which one or more replacement files are generated after the original month in which the file was generated. The higher the number, the more time has elapsed following the dates of service in the file.
This variable will never contain NULL values
SOURCE: T-MSIS Analytic File (TAF) Claims (derived)