Disabled Americans Work Incentive Act of 1989

Disabled Americans Work Incentive Act of 1989 - Amends part A (Hospital Insurance) of title XVIII (Medicare) of the Social Security Act to continue the part A eligibility of physically or mentally impaired individuals who were eligible for such benefits by reason of their entitlement to disability benefits under title II (Old Age, Survivors and Disability Insurance) of the Act, but whose title II benefits have been terminated because they engaged in substantial gainful activity. Sets forth enrollment, special enrollment, and coverage periods as well as the contingencies terminating one's enrollment. Conditions such continued part A eligibility upon the payment of a monthly premium.

Requires individuals who are entitled to part B (Supplementary Medical Insurance) Medicare benefits only by reason of their continued part A eligibility provided by this Act to pay a monthly premium set at four times the amount otherwise required under part B. Prohibits such part A and B premiums from exceeding a specified percentage of the individual's adjusted gross income, unless the premium thereby sinks below 25 percent of the premium determined without income restraints.

Prohibits the benefits provided by this Act from supplanting employer group health plan benefits.