Figure 1.

The NHIS of Nigeria: revenue raising, pooling, purchasing and provision. Source: Developed by the authors based on Murray and Frenk [12] and studies/references from the review. Notes: The relative size of each element does not equate to population size; Shaded boxes = NHIS elements; NHIS = National Health Insurance Scheme; FSHIP = Formal Sector Social Health Insurance programme; USSHIP = Urban Self-Employed Social Health Insurance Programme; RCSHIP = Rural Community Social Health Insurance Programme; DF = Donor Funding; CBHI = Community-Based Health Insurance; PHI = Private Health Insurance; OOP = Out-of-pocket, T.C. = Tertiary care; S.C. = Secondary care; P.C. = Primary care; LGA = Local Government Authority; HMO = Health Maintenance organisation; MoH = Ministry of Health