In early 2022 R1 versions, patient claims that had a status of PENDABLE (i.e. received an ACCEPTABLE level error, e.g. 9641 error etc.) were not being resubmitted (i.e. not re-sent as PENDED).
This means claims may have not been processed despite appearing to have done so.
We have fixed this issue as of 2022-03-22. Updates after this date have the fix.
Those on older versions should Update and use Invoice Copies -> Submit Claim to resubmit these claims. Alternatively they can provide a printed Invoice & Receipt to patients to take to a Medicare office.