Uninsured motorist claim step by step 2026

An uninsured motorist (UM) or underinsured motorist (UIM) claim is procedurally different from a standard third-party liability claim. The claimant is suing/claiming against their own insurer rather than the at-fault driver's insurer, which changes the negotiation dynamic, the documentation requirements, and the legal posture. This page walks through a generic step-by-step UM claim process based on NAIC model standards, state insurance commissioner directives, and standard policy structures, with cross-reference to the more tactical UIM claim strategy 2026 page for stacking and bad-faith analysis.

This is educational content only. Each state has its own UM/UIM regulatory framework — some require offer-and-rejection forms (Texas), some have stacking presumptions (Pennsylvania, Florida), some require arbitration (California with limit-conforming clauses). Always verify state law and policy language with a licensed attorney.

Step 1: Confirm UM/UIM coverage exists

The first step is verification of coverage. Pull your auto insurance declarations page and confirm:

• UM bodily injury (UMBI) limits
• UM property damage (UMPD) limits if separate
• UIM bodily injury (UIM/UIMBI) limits, if your state separates UM and UIM
• Stacking endorsement language
• Number of vehicles on policy
• Resident relatives covered as named insureds
• Other policies in household (spouse's vehicle, parent's policy if dependent)

If declarations show "$0" or no UM/UIM coverage, check whether the state requires written rejection. Texas (TIC § 1952.101), Florida (Fla. Stat. § 627.727), and several other states require written rejection of UM/UIM. A missing or defective rejection may convert "no coverage" into "coverage at minimum statutory limits" through reformation — important rescue argument.

Step 2: Notify the carrier and request claim number

Notify your insurer of the claim within the policy's notice provision (typically "as soon as practicable"). Some policies have explicit time limits (30 days post-loss) but courts generally enforce only when delay caused prejudice to the carrier.

Request:

• Claim number
• Adjuster name, phone, email
• Specific document and form requirements
• Coverage status confirmation in writing
• Copy of full policy and declarations
• Any required statements under oath (some states allow examination under oath, EUO)

Step 3: Build the at-fault driver liability proof

UM/UIM claims still require proving the other driver was at-fault and uninsured/underinsured. Documentation:

• Police accident report or crash report
• Photographs of vehicles, scene, debris field
• Witness statements with contact information
• Surveillance video, dashcam footage, traffic cameras
• Citation records (uniform traffic citation issued to other driver)
• Cell phone records, if distracted driving suspected (subpoena required)
• Crash reconstruction expert if liability disputed
• The other driver's insurance disclosure (or lack thereof)

For a hit-and-run claim where the other driver is unidentified, "phantom vehicle" coverage requires additional proof, typically witness corroboration in many states. Mere uncorroborated statement of the insured is insufficient under most policies.

Step 4: Coverage exhaustion (UIM specific)

Most policies require exhaustion of the at-fault driver's liability limits before UIM benefits are payable. Process:

1. Obtain the at-fault driver's liability declarations page
2. Make demand on the BI carrier for policy limits
3. Receive tender (acceptance with limits payment)
4. Notify your UIM carrier of the limits tender BEFORE accepting
5. Request UIM carrier's consent to settlement (preserve subrogation)
6. If consent granted, accept tender and proceed with UIM
7. If consent denied, decide between substituted-payment process or rejecting tender

States with substituted-payment statutes (e.g., California Insurance Code § 11580.2(o) for some scenarios) allow UIM carrier to substitute payment within statutory window if it wants to preserve subrogation. Other states rely on policy language.

Step 5: Document damages comprehensively

UIM demands require complete damages documentation:

• Medical records from all providers (request via HIPAA release; some providers charge per-page fees)
• Medical billing ledger (CPT codes, billed amounts, paid amounts, write-offs)
• Diagnostic imaging (MRI, CT, X-ray) — actual films, not just reports
• Surgical reports if applicable
• Treating physician narrative or report summarizing diagnosis, treatment, prognosis
• Functional capacity evaluation (FCE) if disability is permanent
• Wage loss documentation: pay stubs, W-2s, employer letter
• Lost earning capacity expert report if relevant
• Future care projection: life care plan if catastrophic
• Pain journal contemporaneous documentation
• Photographs of injury progression
• Family member statements re: lifestyle impact (use cautiously, can backfire)

Step 6: Prepare and send written demand

The demand letter is the negotiation centerpiece. Structure:

1. Cover letter
2. Statement of facts: chronology, mechanism of injury, liability proof
3. Coverage analysis: UM/UIM applicability, stacking, exhaustion, consent
4. Damages breakdown: economic, non-economic
5. Net recovery worksheet: anticipated liens and reductions
6. Settlement demand: specific dollar amount with rationale
7. Deadline for response (typically 30-60 days)
8. Exhibits: police report, medical records summary, billing ledger, imaging, expert reports

The demand should be specific enough to require a substantive coverage and valuation response, not a generic "we are reviewing." Many state insurance regulations require timely response to claim communications (e.g., 15-30 days). Document delays.

Step 7: Negotiation, mediation, or arbitration

Most UM/UIM claims resolve through negotiation. If negotiation stalls:

Mediation

Voluntary or court-ordered mediation with neutral third party. Common in serious-injury UIM cases. Costs typically split.

Contractual arbitration

Many UM policies require arbitration of disputed claims. Arbitration provisions vary widely — some require demand within 60 days of impasse, some have limits-conforming clauses (binding only at policy limits), some are non-binding.

State law on arbitration: California allows insurer-favored arbitration if conforming to Insurance Code requirements. Florida requires plaintiff election (Fla. Stat. § 627.727). Texas does not require UM arbitration. Each state's body of arbitration case law affects whether the clause is enforceable.

Litigation

If arbitration is not required or has been concluded, file lawsuit. Defendants are typically the insurer for UM/UIM contractual claim and the at-fault driver for tort claim. Some states require dismissal of the at-fault driver before UIM proceeding (Texas Brainard rule); others permit joinder (Florida).

Bad faith

If insurer engages in unfair claim practices (NAIC Model Unfair Claims Settlement Practices), state-law bad faith claim may be available. Most jurisdictions require predicate breach of contract or unreasonable refusal to pay covered claim.

Step 8: Final settlement and lien resolution

Once settlement is reached:

1. Confirm settlement amount and components in writing
2. Resolve all liens (Medicare, Medicaid, ERISA, hospital, workers comp) — see medical bills after settlement
3. Sign release tailored to UM/UIM scope (preserve any other claims)
4. Receive funds, typically by wire or check
5. Distribute net to client per closing statement
6. Maintain file per state retention requirements (typically 6-7 years)

Special considerations: if settlement is structured (rare in UM but possible), apply IRC § 130. If federal benefits implicated (SSI, Medicaid), engage SNT/elder law counsel before signing release.

Frequently asked questions

Cited sources

• NAIC Model 900 Unfair Claims Settlement Practices
• Texas Department of Insurance UM Guide
• IIHS auto insurance research
• III auto insurance facts