Some Medicare Advantage Organization Denials Raise Concerns About Beneficiary Access

The HHS Office of Inspector General's finding that 13 percent of Medicare Advantage prior authorization denials met Medicare coverage rules is among the most damning data points in the ongoing debate over MA plan behavior. Stated plainly: the federal government's own investigative arm reviewed a sample of MA denial decisions and found that more than one in eight denied services should have been approved under the coverage standards that govern traditional Medicare. For physician practices appealing MA denials, this finding provides both validation and strategic ammunition.

What the OIG Found

The OIG report, published in April 2022, examined a sample of prior authorization denials and payment denials from 15 of the largest MA organizations. The investigators applied a straightforward test: did the denied service meet Medicare coverage rules? For 13 percent of prior authorization denials, the answer was yes — the MA plan denied a service that traditional Medicare would have covered.

The report also found that 18 percent of payment denials involved claims for services that met both Medicare coverage and MA plan billing rules. These were not ambiguous cases at the margins of coverage policy. They were denials of services that clearly qualified for reimbursement under the applicable standards.

The OIG attributed these inappropriate denials to several factors:

• MA plans using clinical criteria that are more restrictive than traditional Medicare coverage rules
• Denials based on insufficient documentation where the documentation actually supported coverage
• Human error by MA plan reviewers who misapplied coverage criteria
• Automated review systems that flagged services for denial based on incomplete analysis

The Implications for Appeals

The OIG finding that 13 percent of PA denials met Medicare rules has direct implications for how practices approach MA appeals. It establishes, with federal investigative authority, that MA plans deny covered services at a measurable rate. This means that practices appealing MA denials are not tilting at windmills — they are contesting decisions that have a documented probability of being wrong.

For appeal strategy, the OIG report creates a powerful reference point. When a practice appeals an MA denial for a service that clearly falls within Medicare coverage criteria, citing the OIG's finding that MA plans inappropriately deny covered services at documented rates strengthens the appeal's framing. It places the burden on the MA plan to demonstrate why this specific denial is appropriate, given the federal government's documented concern about systematic over-denial.

Systemic Over-Denial as a Business Strategy

The OIG report stops short of characterizing inappropriate denials as intentional, but the pattern is consistent with a well-understood economic dynamic: denying claims is financially advantageous for payers when appeal rates are low. If an MA plan denies 100 claims that should have been approved, and only 30 of those are appealed, the plan avoids payment on 70 claims where payment was owed. The OIG finding suggests that at least some MA plans have calibrated their denial criteria to produce inappropriate denials at a rate that the system tolerates.

For physician practices, this dynamic reinforces the economic logic of systematic appeals. The OIG has documented that the system produces inappropriate denials. The KFF has documented that appeal rates are extremely low. The intersection of these two data points is an environment where practices that do appeal are likely to recover revenue, while those that do not are subsidizing payer profitability through uncontested inappropriate denials.

What Practices Should Do

The OIG report should inform every practice's MA denial management approach. When reviewing MA denials, practices should assess each denial against Medicare coverage criteria — not just the MA plan's stated reason. When those criteria support coverage, the appeal should reference both the applicable Medicare standard and the OIG's documented concern about MA over-denial. The federal government has done the research. Practices need to use it.