Salivary gland, neoplasm, malignant

I have the secondary code of 198.89 for the secondary metastatic disease of the neck, primary unknown.
Do I code the 199.1 primary, then the 198.89 or should I code just the secondary?

re: Salivary gland, neoplasm, malignant

You code the metastatic condition you are managing as primary, then 199.1 as secondary code.