Top Complex Claim Trends Affecting Hospitals and Health Systems

April 29, 2026

Hospital revenue cycles are under sustained pressure as complex claims, driven by denials, prior authorization, non‑standard payers, and rising patient responsibility, consume a growing share of administrative resources while delaying or eroding cash flow.¹ These high‑friction claims continue to represent a disproportionate impact on Days in A/R, cost‑to‑collect, and net revenue realization.²

Below are the top complex claim trends constraining financial performance and outlining where operational capacity and payer friction are creating preventable revenue loss.

Denials rising in volume and complexity
Initial hospital claim denial rates remained elevated in 2024, approximately 11–12% nationally, but the composition of denials has materially shifted.¹ Growth is now concentrated in medical‑necessity determinations, clinical validation disputes, and post‑payment documentation audits, rather than front‑end eligibility or authorization errors.³ These denials require higher cost resources (nurse auditors, physician advisors, CDI specialists) to resolve and extend resolution timelines well beyond traditional billing cycles.

The financial burden of this shift is substantial. Hospitals and health systems collectively spend billions of dollars annually contesting denied claims, with more than half of appealed denials ultimately overturned, strong evidence of inappropriate, premature, or algorithm‑driven denials rather than true billing errors.⁴ Despite high overturn rates, a significant portion of denials are never appealed due to staffing shortages and low expected ROI, resulting in avoidable write‑offs and suppressed net revenue.

Medicare Advantage prior authorization is a major complex claim driver
Medicare Advantage (MA) plans processed nearly 53 million prior authorization requests in 2024, with approximately 7.7–8% partially or fully denied. While formal appeals are filed in only a small fraction of cases, more than 80% of appealed denials are overturned, highlighting a disconnect between initial determinations and clinical appropriateness.⁵These dynamics have made MA prior authorization one of the most resource‑intensive drivers of downstream denials and delayed cash flow.

Operationally, hospitals and ambulatory surgery centers are increasingly treating prior authorization as a defensive revenue cycle function rather than a simple pre‑service checkpoint. Organizations now deploy expanded clinical documentation, real‑time payer escalation, and patient engagement strategies to prevent care delays and reduce denial exposure. This front-loaded effort shifts cost earlier in the revenue cycle but is often necessary to protect reimbursement and avoid post‑service disputes that are even more expensive to resolve.

Prior authorization burden is fueling burnout
According to the AMA’s 2024 physician survey, physicians complete approximately 39–43 prior authorizations per week, consuming significant clinical and administrative time. An overwhelming 93–94% of physicians report care delays linked to prior authorization requirements, and roughly one-quarter report adverse events associated with those delays.⁶

From a revenue cycle perspective, these burdens directly degrade documentation quality and timeliness. Burnout, reported by physicians as being worsened by prior authorization, contributes to incomplete notes, delayed signatures, and inconsistent clinical narratives. These gaps materially increase the risk of medical‑necessity denials, retrospective audits, and down‑coding, particularly for inpatient and high‑acuity outpatient encounters.⁶

Workforce shortages magnify complex claim backlogs and write-offs
These constraints often force hospitals to make difficult ROI decisions on complex claims, where ROI calculations often forcing difficult decisions on complex claims. As a result, hospitals experience a widening gap between gross and net revenue and increased reliance on contingent labor or outsourcing, further inflating cost‑to‑collect during an already fragile financial period.⁴

Non-standard claims remain high friction
KFF analysis reporting consistently highlight that administrative complexity and fragmented payer responsibility are major drivers of hospital financial strain. Secondary and non-standard payer arrangements, including liability-related coverage, add administrative complexity, shift payment risk to providers when accountability is disputed or delayed, contributing to cash‑flow volatility and uncompensated care exposure. KFF’s hospital finance research underscores that these non‑standard claims amplify administrative costs at a time when hospitals already devote over 40% of total expenses to administration.²

Patient responsibility headwinds complicate post-payer resolution
Even after payer adjudication, hospitals are experiencing greater volatility in insured patient responsibility and collections, driven by high deductibles, coinsurance, and affordability pressures. Becker’s analysis shows that patient responsibility now represents one of the most volatile components of net revenue, particularly when layered onto already complex or delayed claims.¹

For complex claims, delayed payer resolution often pushes patient billing months after care delivery, reducing collectability and increasing bad debt risk. This dynamic extends resolution cycles, inflates self‑pay A/R, and forces hospitals to choose between costly collection efforts and write‑offs, further compressing margins in an already constrained operating environment.

About Elevate Patient Financial Solutions^®
For more than 45 years, ElevatePFS has delivered exceptional revenue cycle management services to healthcare providers nationwide. Its comprehensive solutions, including Eligibility and Enrollment, Complex Claims, Denials Management, Extended Business Office Engagements, and Self-Pay/Early Out Services, drive optimal financial performance while improving the patient experience.

ElevatePFS Complex Claims services are designed to resolve high-friction accounts that require advanced expertise, specialized tools, and clinical insight. From third party liability recovery to complex authorization and medical necessity denials, our teams identify broader recovery opportunities earlier, before balances spill over to patient responsibility. Experienced clinical and revenue cycle professionals, including nurses, address denials at the root cause, accelerate resolution, and help prevent repeat issues, driving faster cash flow and improved net revenue realization.

With a 95% client retention rate, ElevatePFS is a trusted, proven partner for sustainable revenue recovery and patient-centered financial engagement. ElevatePFS has earned the HFMA Peer Review designation for over 15 years, achieved Great Place to Work® certification for four consecutive years, and received the 2025 Best in KLAS recognition for Eligibility. To learn more, visit ElevatePFS.com.

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Top Complex Claim Trends Affecting Hospitals and Health Systems

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