Medical Premiums & MOSERS Retirement Benefit Check

My husband and I both retired in our late 50's and still have 5 years to go before we reach medicare age. Hopefully this won't happen, but if insurance keeps going up what would happen if the amount of our insurance exceeds the amount of my benefit check? Both of our premiums are taken out of my check. I'm worried about the increasing cost. As we don't want to lose the insurance would we be able to pay the amount not covered by my benefit check directly to MOSERS?

Note: MOSERS administers retirement, life insurance and long-term disability insurance benefits. For most state employees, health care is administered by Missouri Consolidated Health Care Plan (MCHCP). They provided us with a response for this question below. 

MCHCP will not deduct partial premiums from a retirement benefit check.  If the MCHCP premium is more than the retiree’s benefit check amount, then MCHCP will automatically set up the member on direct bill payment. MCHCP will mail a billing statement to the retiree/member showing the premiums due and the date payment is due. Members on direct bill have other payment opportunities including automatic (ACH) withdrawal from a bank account or online bill pay. The automatic withdrawal authorization form is available can be found on the MCHCP website: http://www.mchcp.org/forms/st_autoWithdraw.pdf.

Also, members on direct bill may choose to pay premiums online through their myMCHCP account using a debit or credit card. Please note the bank which administers the online payment process for MCHCP charges a service fee when a member uses this payment option.