How the estimate is calculated. Annual leakage = (annual net patient revenue x commercial share) x your selected underpayment rate. Commercial revenue is used as the base because contract-rate underpayment occurs on negotiated commercial and managed-care claims; government payers reimburse at largely fixed rates. The recoverable range applies 40–60% to estimated leakage, reflecting the portion of identified underpayments typically recoverable through systematic, time-windowed appeals.

On the underpayment rate. The 1–3% range reflects commonly cited commercial payment-variance and underpayment benchmarks in healthcare revenue-cycle practice. You select the rate, so the output is always transparent to your own assumption rather than a fixed vendor figure.

Why appeals matter. Federal transparency data analyzed by KFF shows that even outright denials are rarely challenged — consumers and providers appealed fewer than 1% of denied in-network claims, and where appeals were filed, insurers reversed a meaningful share. Underpayments (partial payment below the contracted rate) are even harder to detect without contract-term-level modeling, so they routinely go unrecovered.

Primary sources (trusted government / national organizations):

• KFF, Claims Denials and Appeals in ACA Marketplace Plans (2024) — analysis of CMS Transparency in Coverage data: 19% in-network denial rate; under 1% of denials appealed.
• Centers for Medicare & Medicaid Services (CMS) — Transparency in Coverage public use files; hospital cost reports.
• Healthcare Financial Management Association (HFMA) — revenue-cycle and payment-variance benchmarks.
• American Hospital Association (AHA) — hospital financial and administrative-cost data.

Note for publishing: before going live, confirm the specific HFMA/AHA benchmark citation you wish to stand behind for the underpayment range, and update the link above if you prefer a different primary source.