Approx 12/31/15 EE was assisting working on material washer, he slipped and fell against the guardrail. This incident was not reported to anyone; he went to his family Dr. On 1/11/16 he went to get on track hoe when he experienced pain on his right side. On 1/13/16 he returned to family doctor and then reported it to HR dept. The safety coordinator was not informed until 1/19/16.