California requires all automobile insurance policies to include uninsured motorist (UM) and underinsured motorist (UIM) coverage unless the policyholder explicitly waives it in writing. Despite this requirement, a significant number of policyholders do not understand how to access this coverage after an accident.
The Insurance Research Council estimated that approximately 16.6 percent of California drivers were uninsured as of the most recent available data. In Los Angeles County specifically, uninsured driver rates in certain zip codes exceed 25 percent.
How UM Coverage Activates After a Hit-and-Run Incident
California UM coverage activates after a hit-and-run collision if physical contact between vehicles is established or if independent witness testimony corroborates the claimant’s account of being struck by an unidentified vehicle. The physical contact requirement prevents fraudulent phantom vehicle claims.
Reporting a hit-and-run to law enforcement within 24 hours strengthens the UM claim by creating a contemporaneous record. Delay in reporting is used by insurance carriers as a basis for skepticism about the physical contact requirement.
How Underinsured Motorist Coverage Works in California
UIM coverage activates when the at-fault driver’s liability limits are insufficient to fully compensate the injured party’s damages. California’s minimum liability limits of $30,000 per person as of 2025 are frequently exhausted in cases involving significant injury. Consulting a Los Angeles collision attorney before accepting the at-fault driver’s policy limits is essential, because accepting payment without preserving UIM rights can inadvertently release the underinsured motorist coverage that would otherwise compensate the balance of the claim.
What Arbitration Clauses in UM/UIM Claims Mean for Claimants
California law permits insurance policies to include mandatory arbitration clauses for UM/UIM disputes, requiring claimants to resolve disagreements through a private arbitration process rather than a jury trial. Arbitration in California is generally binding, making it important to understand the dispute resolution mechanism in one’s policy before an accident occurs.
How Bad Faith Claims Arise in UM/UIM Denials
An insurer that unreasonably delays or denies a valid UM/UIM claim can be liable for bad faith damages under California law, potentially including punitive damages in egregious cases. Bad faith liability creates additional legal leverage available to claimants whose own insurers are improperly handling covered claims.
Uninsured and underinsured motorist coverage is among the most valuable protections available to California drivers, yet it is frequently misunderstood and underutilized. Claims involving these coverage types require careful sequencing of settlement steps to avoid inadvertent waiver, and they benefit substantially from legal guidance throughout the process.
