For the following questions, use an ICD-9-CM code book and select the appropriate code(s) from the diagnostic statement given

One of the peak times of transmission of the West Nile virus is

a. Early spring b. Late spring c. Early fall d. Late fall

How long must someone have back pain for it to be considered chronic?

A) 1 month B) 3 months C) 6 months D) 1 year