Special Investigations Unit (SIU) Services

Special Investigations Units (SIUs) are specialized teams within insurance carriers, third-party administrators, and independent claim organizations tasked with detecting, investigating, and referring suspected fraudulent claims. This page covers the regulatory framework governing SIU operations, the investigative process from referral to resolution, the claim types most frequently routed to SIU review, and the criteria that determine when a claim crosses the threshold from routine adjustment into formal SIU handling. Understanding SIU services is relevant to adjusters, policyholders, and administrators navigating the insurance claim investigation process.

Definition and Scope

An SIU is a formally designated investigative function required by regulation in the majority of US states for insurers writing above a specified premium volume. The National Insurance Crime Bureau (NICRB) — a nonprofit organization working with insurers and law enforcement — estimates that insurance fraud costs the US property-casualty industry more than $30 billion annually (NICB, public fact sheet). That scale is the primary driver behind regulatory mandates.

The regulatory foundation for SIU requirements derives from the Insurance Fraud Prevention Model Act, developed by the National Association of Insurance Commissioners (NAIC) and adopted in modified form across the states. California's SIU regulations appear at California Insurance Code §1875.20–1875.26 and 10 CCR §2698.30–2698.38, establishing minimum staffing, training, and reporting obligations. New York's equivalent is codified at New York Insurance Law §405 and 11 NYCRR Part 86. The NAIC Model Regulation on SIUs (Model #901) provides the template most state departments of insurance have adapted.

SIU scope encompasses:

• Property claims — structural damage, contents, and arson-related investigations
• Casualty and liability claims — bodily injury, premises liability, staged accidents
• Workers' compensation claims — medical provider fraud, claimant misrepresentation
• Auto claims — vehicle theft, collision staging, glass and diminished value schemes
• Life and health claims — policy misrepresentation, identity fraud, billing irregularities

The boundary between standard claims handling and SIU involvement is not discretionary — regulated carriers must maintain written referral criteria and document every referral decision. This intersects directly with claims-handling standards and regulations enforced at the state level.

How It Works

SIU operations follow a structured process that runs parallel to — and sometimes pauses — the primary claims adjustment workflow.

1. Referral trigger — A front-line adjuster, desk reviewer, or automated fraud scoring system identifies one or more red flags meeting the carrier's written referral criteria. Common triggers include prior similar losses, inconsistency between reported damage and physical evidence, late reporting beyond policy requirements, and conflicting recorded statements.

2. Intake and triage — An SIU intake specialist or case manager receives the referral, assigns a severity tier, and determines whether the matter warrants field investigation, a desk review, or immediate law enforcement notification.

3. Field investigation — SIU investigators — many of whom hold the Certified Insurance Fraud Investigator (CIFI) credential issued by the International Association of Special Investigation Units (IASIU) — conduct recorded interviews, scene inspections, social media analysis, and database searches through tools such as ISO ClaimSearch.

4. Documentation and reporting — All investigative findings are memorialized in a written SIU report. Carriers subject to state mandates must submit an annual SIU activity report to their state department of insurance, and must file Suspicious Activity Reports (SARs) or equivalent fraud referrals with state fraud bureaus within timeframes established by statute (commonly 30 to 60 days from determination).

5. Resolution — The SIU closes a case through one of four outcomes: claim paid in full, claim paid with adjustment, claim denied on fraud grounds, or referral to law enforcement and the state fraud bureau for criminal prosecution.

The investigation phase does not automatically suspend the carrier's claims-handling clock. State fair claims practice statutes — modeled on the NAIC Unfair Claims Settlement Practices Act (Model #900) — impose acknowledgment, investigation, and decision deadlines even when an SIU review is active. Failure to comply can constitute bad faith insurance claims and adjuster conduct.

Common Scenarios

Certain claim patterns account for a disproportionate share of SIU referrals across the property-casualty market.

Staged auto accidents remain the highest-volume fraud category reported to the NICB. Schemes include "swoop and squat" collisions, paper accidents with no actual vehicles involved, and opportunistic padding of legitimate minor-impact claims.

Arson for profit cases are typically triggered when accelerant patterns appear in fire investigation reports, when a property owner has multiple prior fire losses on ISO ClaimSearch, or when the insured carried a recently increased policy limit. These cases routinely involve coordination between the SIU and public fire investigators. See fire damage claims adjustment services for the parallel adjustment process.

Workers' compensation fraud involves claimant-side misrepresentation (working while receiving disability benefits), provider-side fraud (billing for services not rendered), and employer-side misrepresentation of payroll or classification codes. The National Council on Compensation Insurance (NCCI) tracks fraud indicators as part of its data collection function. This overlaps with the scope covered under workers' compensation claims adjustment.

Water and mold claims frequently involve inflated contractor estimates, pre-existing conditions misrepresented as sudden losses, and referral-ring schemes between contractors and public adjusters. Water and mold damage claims adjustment explains the standard adjustment side of these losses.

Medical provider billing fraud in health and auto personal injury protection (PIP) lines includes unbundling of CPT codes, upcoding, and billing for phantom treatments. Florida and New York, both high-PIP fraud states, have enacted specific anti-fraud statutes targeting these schemes.

Decision Boundaries

The decision to route a claim to SIU rather than standard adjustment — and to escalate within the SIU from internal review to law enforcement referral — depends on defined criteria that vary by carrier but are constrained by state regulatory minimums.

SIU referral vs. standard adjustment:

A standard adjuster handles claims where the facts are internally consistent, loss documentation is complete, and no red flags appear on ISO ClaimSearch or the carrier's internal loss history. An SIU referral is required when written referral criteria are met — not when an adjuster develops a subjective suspicion. NAIC Model #901 explicitly requires that referral criteria be objective and documented.

Internal SIU investigation vs. law enforcement referral:

Internal investigation is appropriate when the suspected fraud is a civil matter (policy rescission, denial of benefits) or when evidence is insufficient for criminal referral. Law enforcement referral — to the state fraud bureau, local district attorney, or FBI if the scheme is multi-state — is appropriate when evidence meets the probable cause threshold and the carrier has completed its internal documentation. Most state statutes provide civil immunity for good-faith fraud referrals, a provision modeled on NAIC guidance.

SIU vs. insurance appraisal process:

These are distinct mechanisms. The appraisal process resolves disputes over the amount of loss between a carrier and policyholder and is a contractual right under most property policies. SIU involvement addresses the legitimacy of the claim itself — whether a covered loss occurred and whether the claimant is entitled to any benefit. A claim under SIU review is generally not simultaneously eligible for appraisal until the coverage question is resolved.

Adjusters interacting with SIU-referred claims must understand that policyholder rights in the claims process remain fully operative during an SIU investigation. Policyholders retain rights to timely communications, access to policy provisions, and fair handling regardless of SIU status.

References

• National Association of Insurance Commissioners (NAIC) — Model Regulation on SIUs, Model #901
• National Insurance Crime Bureau (NICB) — Insurance Fraud Facts
• International Association of Special Investigation Units (IASIU)
• California Department of Insurance — SIU Regulations, 10 CCR §2698.30–2698.38
• NAIC Unfair Claims Settlement Practices Act, Model #900
• National Council on Compensation Insurance (NCCI)
• California Insurance Code §1875.20–1875.26
• New York Insurance Law §405 and 11 NYCRR Part 86