Final answer:
When reporting an Occurrence code on a claim, it is essential to also provide the Date of Service, which specifies when the medical service or event took place.
Step-by-step explanation:
When an Occurrence code is reported on a claim, the information that must also be reported is Date of Service. Occurrence codes are used on health insurance claims to indicate the dates of important events that are relevant to the claim. Along with the occurrence code, the Date of Service is essential as it indicates when the service was performed or the event occurred. This information is critical for processing a claim as it provides the context in regards to timing in relation to the treatment or services provided to the patient.