MO HB404

Expands the definition of occupational disease for paid police officers certified under Chapter 590 to include psychological stress if a direct causal relationship is established, matching existing coverage for firefighters.

Requires occupational disease claims to be compensable only if occupational exposure was the prevailing factor in causing both the resulting medical condition and disability.

Recognizes repetitive motion injuries, industrial noise-induced hearing loss, radiation disability, and contagious or communicable diseases contracted during employment as occupational diseases.

Establishes that employers are liable for repetitive motion occupational diseases contracted within three months if the exposure with the immediate prior employer was the prevailing factor.

Codifies the construction industry premium rate equalization formula in effect on January 1, 1999, effective January 1, 2014.