The $79 Million Counting Problem

Nobody set out to defraud Medicare. That is the part of this story that should keep you up at night.

The OIG pulled 250 inpatient claims assigned to MS-DRG 207 or MS-DRG 870, the MS-DRGs that drive higher payment when a patient has been on mechanical ventilation for more than 96 hours. Of those 250 claims, 17 were wrong. Eight of them had the same problem: the patient had not been on the ventilator for more than 96 hours. Somebody assigned 5A1955Z anyway. Somebody did not go back to the respiratory flowsheet and count the hours. Across the full audit, the OIG estimated $79.3 million in improper Medicare payments tied to mechanical ventilation claims. CMS has now directed its MACs to go recover it.

Not fraud. Counting errors.

That distinction matters more than I think most people realize, because the instinct when you hear a number like $79 million is to assume someone knew what they were doing. Someone was gaming the system, inflating claims on purpose, pulling a lever they knew would shift DRGs. That is a comfortable story, because it means the problem belongs to a different kind of person than you.

It does not belong to a different kind of person. It belongs to the gap.

The Gap Between Exams and Reality

The gap is the space between what certification exams test and what inpatient coding actually requires. An exam asks you to recognize that 5A1955Z is the code for continuous mechanical ventilation for 96 or more consecutive hours. You learn it, you remember it on test day, and you move on. What the exam does not test is whether you can sit down in front of a real chart, locate the respiratory flowsheets across three calendar days, account for a brief extubation trial and reintubation, and then do the math correctly before you assign that code.

That second skill is not harder to learn. It is just different. It requires a workflow, not a fact.

The nine other incorrect claims in the OIG sample were a different version of the same problem. Wrong diagnosis code. Procedure code that had nothing to do with mechanical ventilation. Someone saw "ventilator" in a note and reached for the code by instinct, without going back to verify that the documentation actually supported it. Instinct is useful when you have 17 years of charts behind it. Instinct without verification is how you end up in a MAC audit with your employer's name attached to the findings.

This Is Not a Suggestion. It Is a Preview.

The OIG is not done with this area. "Selected Inpatient and Outpatient Billing Requirements" is sitting active on the HHS-OIG Work Plan right now, and Medicare Hospital Compliance audits are running through this year. When the OIG publishes guidance to hospitals telling them to verify that diagnosis and procedure codes are supported in the record and to train coding staff on DRG assignment, that is not a suggestion. That is a preview.

Vent hours, transfers, and DRG-shifting procedure codes are getting looked at. If you code in a facility that sees ventilated patients, your work is going to be reviewed. The question is whether your documentation trail holds up when it is.

What I Want You to Actually Do

Here is what I want you to actually do with this.

Pull up the ICD-10-PCS table for continuous mechanical ventilation. Look at the hour thresholds. Now ask yourself: the last time you assigned a code in that table, did you verify the hours in the chart, or did you work from the discharge summary? If the answer is "I worked from the discharge summary," that is the gap. The summary is not the source of truth for vent hours. The respiratory flowsheet is.

This is not about covering yourself when an auditor shows up. That is a side effect. This is about the accuracy that patients and payers are entitled to, and that your name on a claim is supposed to guarantee.

The exam told you the code. The work requires you to earn it.