Safety Net Hospital Pharmacy Access Act of 2003 - Amends title XIX (Medicaid) of the Social Security Act (SSA) to exclude inpatient prices charged to certain high-volume disproportionate share hospital (DSH) safety net providers from the Medicaid "best price" rule. (Thus allows such providers to negotiate with pharmaceutical companies to receive deeper discounts on the prices of inpatient drugs. Currently such entities are able to receive discounts only on outpatient drugs because of a specified Center for Medicare and Medicaid Services interpretation of the "best price" exemption under the Medicaid drug rebate program.) Applies to any such drug purchased for inpatient use certain auditing and recordkeeping requirements under the Public Health Service Act.