Revenue Cycle and Billing/Coding Compliance Auditing
What to know
Revenue cycle auditing spans scheduling, registration, charge capture, coding, claim submission, and collections. Auditors test coding accuracy (ICD-10-CM/PCS, CPT/HCPCS), medical necessity, modifier use (e.g., -25, -59/X-modifiers), charge master integrity, and claim edits. Know the concepts: upcoding, unbundling, duplicate billing, and the role of the NCCI edits and LCD/NCD coverage determinations. Understand the difference between a coding error and a compliance violation-both matter, but the latter can trigger FCA exposure.
Traps
Questions conflate coding accuracy with medical necessity-a code can be accurate but not medically necessary (or vice versa). Watch for modifier misuse traps: -25 requires a significant, separately identifiable E/M service; -59/X-modifiers require distinct services. Also, do not assume a clean claim is a compliant claim-edits don't catch everything. And remember that documentation must support the level of service, not just the diagnosis.
Rule of thumb
Trace the claim back to the documentation: Does the record support the code, the modifier, and the medical necessity? If any leg fails, flag it.
Worked example
An auditor reviews a claim with an E/M visit and a minor procedure on the same day, billed with modifier -25. The documentation shows the E/M addressed only the procedure's pre-op clearance with no separate problem. The -25 is unsupported; the E/M should be bundled, and the auditor reports a modifier error and potential overpayment.