Which DWC notice requires proof of service?

The correct choice is associated with the DWC 500-E notice, which pertains to claim denial. This notice requires proof of service because it is important to document that the claimant has been officially informed about the denial of their workers' compensation claim. Providing proof of service ensures that the claimant has received the necessary information regarding the denial, which can be crucial for any potential dispute or appeals process that may follow.

The other notices mentioned do not carry the same requirement for proof of service. For instance, the DWC 1 is primarily a claim form that initiates the claim process but does not require proof of service upon submission. The DWC 500 is related to medical reporting and also does not necessitate a formal proof of service like the denial notice does. Lastly, the DWC 5021, which is a notice of acceptance, is generally sent to inform the claimant that their claim has been accepted, and while it is important information, it does not specifically require proof of service in the same way that a denial notice does.