I do not have a 1099-HC. What should I put in taxpayer's health insurance worksheet as the Ins. Co subscriber no.?

The subscriber number is your insurance policy or ID number. This number will be on your insurance card. 

I do not have the Ins subscriber number what should i do?

Just to make sure we're on the same page, are you asking about the subscriber number on Form MA 1099-HC on your Massachusetts state return? 

Form 1099-HC is issued by your health insurance carrier.  To download an electronic version of your 1099-HC, you can sign into your medical insurance carrier’s online account, or you can contact member services at the number on your ID card.

For more information, see Mass.gov's 1095-B and 1099-HC tax form page.