When Principal procedure is reported in HI segment, loop 2300, it's reported along with Principal Procedure Date.
What date should be used to verify validity of the Procedure code (HI01-02): - principal procedure date, sent in corresponding HI01-04,
or
- service date, calculated from Statement date (DTP*434) and/or Discharge date (Occurrence HI*BH) ?
This issue is explicitly addressed in the 005010X223A2 TR3. The Loop 2300 element HI01-04 is defined as the Principle Procedure Date and relates directly to the Principle Procedure Code from the corresponding Loop 2300 element HI01-02.