Medical-bill advocacy is the name generally attributed to the industry that has developed in response to a growing problem of erroneous charges on hospital bills.

But other consumers have occasionally reported problems with late payments or erroneous charges.

But many more did not find out until opening their monthly bills and finding hundreds or even thousands of dollars in erroneous charges.

The big picture is that erroneous charges paid by an insurance plan eventually come, fully or partly, from the participants in the plan.

So, directly or indirectly, patients have a big personal stake in trimming medical bills that contain erroneous charges.

All the invoices for service we reviewed had erroneous charges.

Visa says using the number greatly reduces the incidence of erroneous charges.

Other users complained of computer issues, erroneous charges, and problems with docking stations.

But last April he received a letter from the bureau's billing unit apologizing for an erroneous charge.

Getting erroneous charges removed has proved a difficult and expensive process.