Medicaid AIDS and HIV Amendments of 1990 - Amends title XIX (Medicaid) of the Social Security Act to allow each State to provide Medicaid coverage of HIV-related services for individuals who have the HIV virus and an abnormally low immune function for which medical intervention is indicated and whose income and resources do not exceed the maximum amounts allowed under the State Medicaid program for disabled individuals.

Allows States to provide Medicaid home and community-based services to children who have acquired immune deficiency syndrome (AIDS). Applies the same income and resource eligibility standards as would apply if such children were hospitalized.

Requires States to increase payments for inpatient hospital services delivered to Medicare (title XVIII of the Social Security Act) beneficiaries with AIDS by hospitals serving high volumes of AIDS victims.

Permits States to provide Medicaid coverage of the premiums charged individuals who are eligible for continued employer group health plan coverage after their loss of employment if such individuals also have the HIV virus and an income at or below the Federal poverty level.