Mr. Smith works for employer A, and he and his wife are covered through employer A's GHP (Plan A). Neither is eligible for Medicare nor has ESRD. Mrs. Smith works for employer B, and is also covered by employer B's plan (Plan B). Plan A is more comprehensive than Plan B and covers certain items and services which Plan B does not cover, such as prescription drugs. If Mrs. Smith obtains a medical service, Plan B pays primary and Plan A pays secondary. That is, Plan A covers Plan B copayment amounts and items and services that Plan A covers but that Plan B does not.
Mr. Jones also works for employer A, and he and his wife are covered by Plan A. Mrs. Jones does not have other GHP coverage. Mrs. Jones develops ESRD and becomes entitled to Medicare on that basis. Plan A pays primary to Medicare during the first 18 months of Medicare entitlement based on ESRD. When Medicare becomes the primary payer, the plan converts Mrs. Jones' coverage to a Medicare supplement policy. That policy pays Medicare deductible and coinsurance amounts but does not pay for items and services not covered by Medicare, which plan A would have covered. That conversion is impermissible because the plan is providing a lower level of coverage for Mrs. Jones, who has ESRD, than it provides for Mrs. Smith, who does not. In other words, if Plan A pays secondary to primary payers other than Medicare, it must provide the same level of secondary benefits when Medicare is primary in order to comply with the nondifferentiation provision.
42 C.F.R. §411.161