Do car insurance companies share my information with other insurance companies?

It depends on the context: you should provide your Social Security Number (SSN) when applying for life, health, or auto/home insurance policies (to pull credit or underwriting data), but you never need to give it to an opposing insurance adjuster after a car accident.

When You Should Provide Your SSN

• Applying for coverage: Life, health, auto, and home insurance companies use your SSN to verify your identity, run credit checks for pricing (underwriting), and prevent fraud.
• Tax reporting: Health insurers require it to file mandatory coverage forms with the IRS.
• Large settlements: Most users on Reddit agree that if you are receiving a large payout or injury settlement (usually over $500), an insurer may legally require your SSN to check for government liens like child support or unpaid taxes before issuing a check.

When You Should NOT Provide Your SSN

• After a car accident (other driver's insurer): If an adjuster from the other driver's insurance company asks for your SSN during a regular claim, you should politely refuse. They do not need it to estimate car repairs, handle property damage, or manage basic injury claims. Giving it to them allows them to search private background and medical databases to find pre-existing conditions and reduce your payout.

Best Practices

• Verify identity: Always confirm you are speaking to the actual, official insurance company before sharing sensitive details.
• Ask why: Ask the representative why the SSN is mandatory and if an alternate identifier works.
• Use secure channels: Never send your SSN via unencrypted email, text message, or unsolicited links.

There is no single insurance company that denies the most claims across every category, but specific major carriers lead in denial rates depending on whether you look at health, home, or auto insurance.

Health Insurance

Data from federal marketplace transparency reports shows that large health insurers routinely deny a significant share of in-network claims:

• Oscar Health: Denies approximately 25% of in-network claims.
• Molina Healthcare: Denies around 22% of claims.
• UnitedHealthcare: Denies roughly 19% to 20% of in-network claims, though historical analysis on specific marketplace subsets has placed their rates higher.
• Cigna: Denies about 19% to 21% of claims.

Homeowners Insurance

Industry analyses and state-level filings indicate that large property and casualty insurers close a high percentage of claims without payment, especially in catastrophe-prone regions:

• Allstate: Averages roughly 47% of property claims closed with no payment.
• Farmers Insurance: Averages around 56% of claims closed with no payment in primary exchange groups.
• State Farm: Posts high variable denial rates depending on the state and catastrophe market (for instance, State Farm Florida reported high no-payment rates following major storm seasons).
• USAA: Frequently reports higher-than-average property claim denial rates in high-risk coastal or weather-heavy states like Florida.

Several major auto insurance companies frequently rank poorly in consumer satisfaction reports and legal analyses due to claim delays and low settlement offers. Legal advocacy groups and consumer watchdogs often highlight the following five large national carriers among the most difficult to deal with regarding claims handling:

• Allstate: Often cited by legal researchers for using aggressive "delay, deny, and defend" tactics and software like Colossus to minimize payout amounts.
• Liberty Mutual: Frequently criticized for high consumer complaint volumes, slow adjuster response times, and disputes over vehicle valuations.
• State Farm: Known in legal and consumer commentary for employing strict defense strategies that frequently result in delayed or contested payouts.
• Progressive: Often flagged by policyholders and consumer advocates for undervaluing vehicle damage claims and protracted dispute processes.
• Farmers Insurance: Routinely scores below average in consumer satisfaction surveys concerning collision repair experiences and claim settlements.

USAA is widely ranked as the most trusted auto insurance company by major customer satisfaction and industry reputation studies.

Top Trusted Auto Insurers

• USAA: Ranks highest for customer trust and experience, though it is restricted to military members, veterans, and their families.
• Amica: Highly rated for long-term customer loyalty and smooth claims handling.
• State Farm: Frequently cited for large market share and strong digital tools, alongside high consumer brand recognition.
• Travelers: Noted for overall reliability, financial stability, and strong customer satisfaction.

Factors That Define Trust

• Financial Strength: High ratings from agencies like A.M. Best guarantee a company can pay out major claims.
• Customer Complaints: Trusted providers maintain a lower volume of official complaints relative to their size.
• Claims Satisfaction: Ease of communication and fair payouts during an accident build long-term consumer confidence.

Avoid "fly-by-night" ultra-budget insurers, carriers with persistent consumer complaint trends regarding delayed payouts, and stripped-down policy coverages that leave you financially exposed.

Companies and Categories to Avoid

• Fly-by-Night Budget Insurers: Companies like Fred Loya, BlueFire, and Mendota often feature very low upfront prices. However, personal injury attorneys and consumer reports note they frequently suffer from understaffed claims departments, poor communication, and automatic policy cancellations or lapses.
• Carriers with High Complaint Volumes: Major firms like Allstate and Liberty Mutual frequently appear at the bottom of consumer satisfaction indexes and draw criticism from legal professionals for utilizing aggressive claims-adjustment software or low settlement offers.
• Insurers Flagged for Slow Processing: National General, Safeco, and Farmers also surface in consumer data and regional studies for lower customer trust and slower payout communication.

Coverages to Avoid (or Reconsider)

• State-Minimum Liability Only: Choosing the absolute lowest legal limits saves money upfront but leaves you personally responsible if you cause a serious crash with expensive medical bills or property damage.
• Skipping Uninsured/Underinsured Motorist (UM/UIM) Coverage: Skipping this protection means you have no recourse for medical or repair costs if an at-fault driver has no insurance.
• High Collision Deductibles on Low-Value Cars: If your car is worth less than $3,000 to $5,000, paying for collision or comprehensive coverage often costs more than the vehicle is worth.