The state of Virginia, including the Virginia Department of Health and three academic medical centers and one federally qualified health center, plans a two-phase demonstration, first of improvement in the percentage of adults with SCD who are in SCD specialty care (Phase I), then of improvement in adherence to HU of eligible SCD adults (Phase II). Both phases will use existing academic SCD providers, and an innovative, multimodal strategy, featuring specially trained SCD patient navigators (PNs), that addresses barriers to care and to HU use. In Phase I we will demonstrate the feasibility of utilizing PNs to overcome patient access barriers to SCD care. In Phase II we will test the efficacy of PNs for overcoming barriers to acceptance of and adherence with HU therapy. Patients will be randomized to a PN arm or to a usual care arm. Providers will implement NIH guidelines for HU eligibility and prescribing in both arms. All HU eligible patients will be offered HU at each clinical visit. Among patients prescribed HU, if a maximum tolerated dose (MTD, defined in end points) has not been reached, providers will dose escalate every 8-12 weeks to MTD, rather than to clinical effect, before declaring treatment success or failure.