Improving Women's Health Act of 2003

Improving Women's Health Act of 2003 - Amends title XVIII (Medicare) of the Social Security Act (SSA) to: (1) add a variety of preventive health benefits under Medicare, including therapy and counseling for cessation of tobacco use, counseling for post-menopausal women, and screening for diminished visual acuity, and provide enhanced reimbursement for others; (2) eliminate deductibles and coinsurance for existing preventive health benefits; and (3) provide for coverage of substitute adult day services.

Amends SSA title XIX (Medicaid) and XXI (State Children's Health Insurance) (SCHIP) to give States the option to expand or add coverage of certain pregnant women under Medicaid and SCHIP and to provide optional coverage of legal immigrants under such programs.

Makes changes for promoting cessation of tobacco use under the Medicaid program, including removal of cost-sharing for tobacco cessation counseling services for pregnant women, and under the Maternal and Child Health Services program under SSA title V.

Gives States the option under Medicaid of: (1) providing family planning services and supplies to individuals with incomes that do not exceed a State's income eligibility level for medical assistance; and (2) extending the postpartum period for provision of family planning services and supplies.