Migrant health services integration into Nigerian refugee camps is crucial for providing timely medical care to refugees and asylum seekers. A mixed-methods approach involving quantitative surveys and qualitative interviews was employed to evaluate the integration process and its impact on camp residents' health care access. In one of the surveyed camps, 72% of respondents reported improved access to essential medical services compared to before service integration. Patient satisfaction scores increased by an average of 15 points. Integration efforts have significantly enhanced access to healthcare services in selected refugee camps, though challenges persist related to resource allocation and infrastructure development. Further research should focus on long-term sustainability strategies and community engagement for sustained service improvement. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.