Section 287.420 RSMo provides, in pertinent part:
> No proceedings for compensation for any accident under this chapter shall be maintained, unless written notice of the time, place and nature of the injury, and the name and address of the person injured, has been given to the employer no later than thirty days after the accident, unless the employer was not prejudiced by failure to receive the notice.
Section 287.420 requires that an employer be notified regarding the time, place, and nature of an injury. Section 287.020.3(5) defines injury as "violence to the physical structure of the body." Read in conjunction, what is required is that employer be notified regarding the time, place, and nature of the trauma sustained.
An injured worker is not required by § 287.420 to provide his employer with a medical diagnosis, or to keep employer apprised of symptoms and/or opinions (professional or otherwise) regarding the etiology of said symptoms.
The employee is free to secure medical treatment on his own; the employer may be relieved of liability for related medical expenses but, under such circumstances, neither § 287.420 nor any other provision of the Act results in forfeiture of the claim.
We note that although the ALJ finds that employer did not receive written notice of the employee's injury within thirty days it appears that witness Mrs. Michelle Harkins, employer's secretary/treasurer and human resources director, prepared a written account of the April 10, 2011, accident within this time frame. It appears, then, employer possessed a written notice within thirty days. Section 287.420 does not require that such notice be given by the employee. Regardless, the employer had actual notice of employee's injury so there can be no prejudice.