How to Determine if Medicare is the Primary or Secondary Payer

Home Provider Part B Medicare Areas Claims

By federal law, Medicare is a secondary payer to a variety of government and private insurance benefit plans. When your patient receives medical benefits through one or more of the following means, Medicare is the secondary payer:

  • Automobile medical or no-fault insurance
  • Federal Black Lung Program
  • An employer group health plan
  • The Veterans Administration
  • Workers' Compensation
The Internet Only Manual (IOM) Publication 100-5 contains rules and regulations to help you determine whether Medicare is primary or secondary.

Another resource is "Medicare and Other Health Benefits - Who Pays First," a CMS publication, which you can access at
http://www.medicare.gov/Publications/Pubs/pdf/02179.pdf

Page Last Updated: Tuesday, 04-Dec-2007 13:19:16 CST