A pre-bill audit reviews coding, modifier usage, charge capture completeness, and documentation support for medical necessity before a claim ever leaves the building, with the explicit goal of reducing denials and rework at the source rather than correcting them after the fact. This is where NCCI edit compliance gets checked, where Local Coverage Determination medical necessity alignment gets confirmed against the actual diagnosis on file, and where modifier 25 or 59 support gets verified against the documentation, all before submission rather than after a denial forces the review to happen anyway. The value of catching a problem here instead of downstream is straightforward: it never becomes a denial, an appeal, or a write-off in the first place.

Assessed against HIPAA, Stark Law self-referral restrictions, and Anti-Kickback Statute exposure, not just revenue opportunity. A systemic overbilling pattern this uncovers can trigger the 60-day overpayment reporting obligation the moment it's identified, which is why compliance findings are documented and routed differently from a routine revenue-opportunity finding from the start.

Evaluate CPT, ICD-10, HCPCS, and modifier accuracy against what the clinical documentation actually supports, checking explicitly for over-coding as well as under-coding. A pattern that skews too high carries its own compliance exposure, distinct from but just as real as one that leaves revenue on the table.

A post-bill audit compares paid amounts against contracted rates once remittance data is available, verifies that contractual adjustments were applied correctly, and traces denial and write-off patterns back to their actual root cause rather than treating each one as an isolated incident. A genuine underpayment finding requires the fee schedule or contracted rate as a direct comparison basis. Where that specific document isn't available for a given payer, any variance we identify gets labeled as payer-pattern variance rather than confirmed underpayment, because the two carry meaningfully different weight and shouldn't be presented as if they were the same thing.

Aggregate denial reasons by payer, procedure, and workflow step to find the actual pattern behind repeated denials, rather than reworking the same underlying error one claim at a time indefinitely. Fixing the cause once produces a fundamentally different outcome than fixing the same symptom every single week.

For practices billing under Medicare Advantage risk-adjusted payment models, this verifies that every submitted Hierarchical Condition Category code is actually supported by the medical record. The documentation standard and the stakes here are meaningfully different from a standard fee-for-service coding review.