Do you need to fill out the spouse section of the MSP if your spouse already has their own medical plan? Not sure if that is just for information or it is for actually signing up your spouse to your plan.
When you marry or begin living in a marriage-like relationship, you should combine separate MSP accounts into one family account."
Click to see the <a href=http://www2.gov.bc.ca/gov/content/health/health-drug-coverage/msp/bc-residents/managing-your-msp-account/adding-and-removing-dependents>source</a>.