MO HB2375

Amends the definition of compensable injury to require the accident be the prevailing factor in causing the injury, resulting medical condition, disability, and the need for treatment (adding treatment as a new required element)

Eliminates the "extension of premises" doctrine for commuting injuries, making accidents in company-owned vehicles traveling to/from work non-compensable even on customary routes

Allows employers to offset workers' compensation awards by the employer's pro rata share of premiums paid for insurance policies that provide benefits to the injured employee

Creates a new motion to dismiss procedure allowing employers to seek dismissal within 180 days of claim filing based on grounds including untimely notice, intoxication, or claimant not being employed by the employer

Removes the penalty provision that doubled unpaid temporary/partial compensation awards and clarifies that gradual deterioration or progressive degeneration caused by employment risks remains compensable as an occupational disease