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Since, the National Health Insurance Scheme (NHIS) came on stream in Nigeria in 1999, it had been assumed that employees, particularly those in the organized formal sector would voluntarily participate in the scheme, given the inconvenience many had experienced with the previous arrangements. However, participation rate appears to be below expectation. What is even more critical is that there is no idea what this rate of participation might be since, there has been no empirical study to determine it. This tends to make any plan towards mobilizing the populace for embracing the NHIS option a difficult task. In response to this need, this study uses Bayesian approach to estimate the proportion of subscribers to the scheme and makes policy recommendations.