How to Investigate a Workers' Compensation Claim Internally

6/12/2026

There is an important distinction most employers blur: the employer investigates the incident; the carrier investigates the claim. Confusing the two produces documents that hurt the employer, retaliation exposure, and evidence gathered in ways that cannot be used.

Quick answer: HR's internal investigation establishes the facts of the incident for safety, recordkeeping, and accurate reporting. Compensability, medical causation, and fraud are the carrier's domain. Investigate what happened; do not investigate whether the employee deserves benefits.

Two Investigations, Two Purposes

Employer Incident Investigation	Carrier Claim Investigation
What happened and why	Whether the claim is compensable
Preventing recurrence	Medical causation and extent of disability
Accurate First Report data	Benefit calculation and duration
OSHA recordability	Fraud assessment
Safety corrective action	Settlement evaluation

Stay in the left column. The moment HR starts building a case about whether the injury really happened, the documents created become evidence in a retaliation claim.

The Incident Investigation Process

Step 1: Preserve the scene and evidence (immediately)

• Secure the area if a hazard remains
• Photograph the location from multiple angles, including the surrounding area
• Photograph any equipment, tools, materials, or substances involved
• Tag out and preserve equipment if it may have malfunctioned
• Preserve video footage before automatic overwrite — most systems overwrite within days
• Note environmental conditions: lighting, floor surface, temperature, noise, congestion

The video point causes more lost evidence than any other. Issue a preservation instruction the same day.

Step 2: Interview the injured employee

Only after medical care, and only if they are able. Frame it explicitly:

"I want to understand exactly what happened so we can fix anything that needs fixing and make sure the paperwork is accurate. Take me through it step by step."

Cover: what task they were performing, the sequence of events, the exact motion or event, what they felt and where, what they did immediately after, who they told and when, whether anything was unusual about conditions or equipment, and whether they had any prior symptoms in that area.

Record their account in their own words. Do not challenge, do not express doubt, and do not ask questions designed to establish that the injury did not occur.

Step 3: Interview witnesses

Separately, promptly, and factually. Ask what they saw and heard, where they were, and whether they noticed anything about conditions or equipment. Get written statements while memory is fresh.

Step 4: Interview the supervisor

Cover the task assignment, training provided, whether the procedure was being followed, prior incidents in that area, and equipment maintenance history.

Step 5: Review records

• Training and certification records for the task
• Equipment maintenance and inspection logs
• Prior incident reports in the same area or for the same task
• Safety inspection findings
• Applicable standard operating procedures
• Schedule and hours worked — fatigue is a frequent contributing factor

Step 6: Analyze cause

Push past the immediate cause to contributing factors. "Employee lifted improperly" is a symptom. Ask why: was training provided? Was a lift assist available and functional? Was the task designed to require that lift? Was staffing adequate? Was there production pressure?

Root cause analysis is what converts an investigation into prevention.

Step 7: Corrective action

Document what will change, who owns it, and by when. Then verify completion. An investigation without corrective action is documentation of a hazard you knew about — which is worse than not investigating.

What HR Must Not Do

• Do not conduct surveillance. Route to the carrier.
• Do not contact the treating provider outside the channels your state permits.
• Do not interview the employee about suspected fraud.
• Do not ask about unrelated medical history beyond prior injury to the affected area relevant to the claim.
• Do not delay benefits pending your investigation.
• Do not discuss the claim with other employees.
• Do not write conclusions about credibility in the incident file.
• Do not use the investigation to build a termination case.

Documentation Language

Avoid	Use
"Employee claims he was injured…"	"Employee reports that…"
"No one saw this supposed incident."	"No witnesses to the incident were identified."
"Employee has a history of complaining."	Omit — not relevant to the incident investigation.
"Injury appears exaggerated."	Omit — medical assessment is not HR's determination.
"Employee was careless."	"The standard procedure requires use of the lift assist. The lift assist was in the adjacent bay at the time."

Assume every word will be read aloud by opposing counsel, because it may be.

When to Involve Counsel

• Fatality or catastrophic injury
• Potential OSHA citation exposure
• Potential third-party liability worth pursuing through subrogation
• Any indication the employee has retained an attorney
• Facts suggesting an exclusive remedy exception may be argued
• Any consideration of adverse action involving the claimant

Coordinating With the Carrier

• Provide the incident investigation file promptly — it materially improves their compensability analysis
• Share witness statements and photographs
• Flag factual questions without characterizing them as fraud
• Respond to information requests within their deadlines; delay can affect benefit determinations and penalties
• Ask what additional information would help — adjusters generally know what is missing

Frequently Asked Questions

Can we require an employee to give a recorded statement?

The carrier typically takes recorded statements under state procedures. HR should take a factual account for the incident investigation, not a recorded claim statement.

Can we investigate if the employee has an attorney?

Continue the incident investigation for safety and recordkeeping purposes, but route claim-related communication through the carrier and counsel.

Should we interview the employee at the hospital?

No. Care first. Get essential facts from witnesses and the supervisor, and speak with the employee when they are able.

What if the employee refuses to participate?

Document the request and the response. Proceed with witnesses and records. Do not threaten benefits.

How long should an incident investigation take?

Initial fact-gathering within 24 hours; analysis and corrective action within a week for most incidents.

Investigate the Incident, Not the Employee

The employers who handle this well produce investigations that improve safety and support accurate claim handling — and never produce a document that becomes exhibit A in a retaliation case.

The Internal Investigations Certificate Program covers investigation technique, interviewing, and documentation standards. For the workers' compensation and leave intersection, see the Integrating FMLA, ADA, COBRA, and Workers' Compensation program.

👉 See the Workplace Investigation Training Program →

Additional resources: Workers' Comp First Report of Injury | Workers' Compensation Fraud | How to Do an Internal Investigation