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🔍 '''Special investigations unit (SIU)''' is the dedicated team within an [[Definition:Insurance carrier | insurance company]] — or contracted on its behalf — responsible for detecting, investigating, and resolving suspected [[Definition:Insurance fraud | insurance fraud]]. SIUs operate across every major line of business, from [[Definition:Auto insurance | auto]] and [[Definition:Workers' compensation insurance | workers' compensation]] to [[Definition:Health insurance | health]] and [[Definition:Property insurance | property]], and their mandate covers both opportunistic [[Definition:Claim | claims]] padding by individuals and organized fraud rings that systematically exploit insurers. Many [[Definition:Insurance regulator | state regulators]] require carriers above a certain size to maintain an SIU, reflecting the industry's recognition that fraud is not merely a cost-of-business nuisance but a material threat to [[Definition:Loss ratio (L/R) | loss ratios]] and [[Definition:Insurance premium | premium]] affordability.

🛠️ When a [[Definition:Claims adjuster | claims adjuster]] or automated [[Definition:Fraud detection | fraud-scoring algorithm]] flags a suspicious claim, the SIU takes over with a more intensive investigation. Investigators may conduct recorded statements, analyze medical records, review surveillance footage, engage [[Definition:Forensic accounting | forensic accountants]], or coordinate with law enforcement. Modern SIUs increasingly leverage [[Definition:Artificial intelligence (AI) | artificial intelligence]] and [[Definition:Data analytics | data analytics]] platforms that cross-reference claimant histories, social media activity, and network analysis to identify patterns invisible to manual review. The unit also plays a gatekeeper role: it must balance aggressive fraud detection against the risk of unfairly delaying legitimate claims, which can expose the carrier to [[Definition:Bad faith | bad faith]] liability and [[Definition:Regulatory compliance | regulatory]] scrutiny.

💰 The financial stakes are enormous — the [[Definition:Coalition Against Insurance Fraud | Coalition Against Insurance Fraud]] estimates that fraud costs the U.S. insurance industry tens of billions of dollars annually, a burden that ultimately lands on [[Definition:Policyholder | policyholders]] through higher premiums. A well-resourced SIU not only recovers direct savings by denying or reducing fraudulent claims but also creates a deterrent effect that suppresses future fraud attempts. Beyond cost containment, SIUs contribute to the integrity of the [[Definition:Underwriting | underwriting]] process by feeding fraud trends and red flags back to underwriters and product teams, enabling carriers to tighten [[Definition:Underwriting guidelines | guidelines]] and refine [[Definition:Risk selection | risk selection]] in vulnerable segments.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Insurance fraud]]
* [[Definition:Claims adjuster]]
* [[Definition:Bad faith]]
* [[Definition:Fraud detection]]
* [[Definition:Subrogation]]
* [[Definition:Anti-fraud program]]
{{Div col end}}

Definition:Special investigations unit (SIU) - Revision history

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