In effect
X12 276/277 is the HIPAA claim status standard
The ASC X12 276/277 Health Care Claim Status Request and Response, version 005010X212, is the adopted HIPAA standard for the claim status transaction on and after January 1, 2012, with CAQH CORE operating rules added from January 1, 2013. That is why we query status electronically before touching a portal.