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🔎 '''Special investigation unit (SIU)''' is a dedicated team within an [[Definition:Insurance carrier | insurance company]] — or an outsourced function provided by a specialized vendor — responsible for detecting, investigating, and combating [[Definition:Insurance fraud | insurance fraud]]. SIUs handle cases ranging from staged automobile accidents and inflated [[Definition:Property insurance | property]] [[Definition:Claims | claims]] to complex organized fraud rings operating across multiple policies and jurisdictions, serving as the insurer's front line in protecting both the company's [[Definition:Loss ratio (L/R) | loss ratio]] and the broader [[Definition:Policyholder | policyholder]] pool from the costs that fraud imposes.

🕵️ When a [[Definition:Claims adjuster | claims adjuster]] or automated [[Definition:Fraud detection | fraud detection]] system flags a suspicious claim, it is referred to the SIU for deeper scrutiny. Investigators — often former law enforcement professionals — gather evidence through recorded statements, surveillance, public records searches, [[Definition:Data analytics | data analytics]], and cooperation with other carriers and industry databases such as the [[Definition:National Insurance Crime Bureau (NICB) | National Insurance Crime Bureau]]. Many states require insurers to maintain an SIU and to report suspected fraud to a designated state [[Definition:Insurance fraud bureau | fraud bureau]]. Internally, the SIU works closely with [[Definition:Underwriting | underwriting]], legal counsel, and [[Definition:Claims management | claims management]] to ensure that investigative findings either support a [[Definition:Claims denial | claim denial]], enable [[Definition:Subrogation | recovery]], or result in a referral for criminal prosecution.

💡 Fraud accounts for a substantial share of insurance losses industry-wide — estimates frequently cite figures of tens of billions of dollars annually in the United States alone. An effective SIU not only recovers or avoids paying illegitimate claims but also creates a deterrent effect that discourages opportunistic fraud. In the [[Definition:Insurtech | insurtech]] era, SIUs are increasingly augmented by [[Definition:Artificial intelligence (AI) | artificial intelligence]] and [[Definition:Machine learning | machine learning]] models that score claims for fraud propensity at the point of first notice, enabling earlier intervention and more efficient allocation of investigative resources. For carriers, investing in SIU capability is ultimately a bottom-line decision — every dollar of prevented fraud flows directly to [[Definition:Underwriting profit | underwriting profitability]].

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Insurance fraud]]
* [[Definition:Claims management]]
* [[Definition:Fraud detection]]
* [[Definition:National Insurance Crime Bureau (NICB)]]
* [[Definition:Subrogation]]
* [[Definition:Claims adjuster]]
{{Div col end}}

Definition:Special investigation unit (SIU) - Revision history

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