Health insurance expansion for migrants and maternal, perinatal, and infant health outcomes in Colombia: a national cohort study (2013–2020)
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Background During the 2010s, more than 2.8 million Venezuelans migrated to Colombia. Before 2016, migrant women had access to emergency, delivery, and postnatal care but limited access to routine prenatal services. In 2016, eligibility for subsidised health insurance was extended to vulnerable migrant women. We aimed to evaluate the effect of this policy on maternal, perinatal, and infant health outcomes across four groups: migrant enrolled (ME), migrant non-enrolled (MNE), Colombian enrolled (CE), and, Colombian non-enrolled (CNE).
Methods We conducted a national retrospective cohort study of 326,968 singleton live births to migrant mothers in Colombia (2013–2020) using administrative data. We applied difference-in-differences (DiD) models comparing migrants (ME + MNE) and Colombians (CE + CNE), and difference-in-differences-in-differences (DDD) models to estimate changes among migrant women who enrolled in subsidised insurance (ME). Outcomes included infant and maternal mortality, prenatal care utilisation, gestational age, birthweight, birth length, and 5-min Apgar score. Stratified analyses assessed heterogeneity by mother’s education and regional migrant density.
Findings
Between 2013 and 2020, 298,550 migrant mothers were recorded as enrolled in the subsidised scheme at delivery. DiD estimates showed no statistically significant changes in infant mortality or other birth outcomes among migrants relative to Colombians, as all post-policy estimates were not significantly different from zero (95% CIs included the null). In contrast, DDD estimates showed an increase in prenatal care utilisation among enrolled migrant women (τ2017 = 0.37 visits, 95% CI 0.13–0.61; τ2019 = 0.34 visits, 95% CI 0.10–0.57), particularly among mothers with lower educational attainment.
Interpretation
In an insurance-based health system, expanding subsidised coverage increased prenatal care utilisation among migrant women but was not associated with sustained reductions in mortality. These findings highlight the role of formal integration into national health systems in improving access in contexts of large-scale migration.
Funding
NIHR.
Methods We conducted a national retrospective cohort study of 326,968 singleton live births to migrant mothers in Colombia (2013–2020) using administrative data. We applied difference-in-differences (DiD) models comparing migrants (ME + MNE) and Colombians (CE + CNE), and difference-in-differences-in-differences (DDD) models to estimate changes among migrant women who enrolled in subsidised insurance (ME). Outcomes included infant and maternal mortality, prenatal care utilisation, gestational age, birthweight, birth length, and 5-min Apgar score. Stratified analyses assessed heterogeneity by mother’s education and regional migrant density.
Findings
Between 2013 and 2020, 298,550 migrant mothers were recorded as enrolled in the subsidised scheme at delivery. DiD estimates showed no statistically significant changes in infant mortality or other birth outcomes among migrants relative to Colombians, as all post-policy estimates were not significantly different from zero (95% CIs included the null). In contrast, DDD estimates showed an increase in prenatal care utilisation among enrolled migrant women (τ2017 = 0.37 visits, 95% CI 0.13–0.61; τ2019 = 0.34 visits, 95% CI 0.10–0.57), particularly among mothers with lower educational attainment.
Interpretation
In an insurance-based health system, expanding subsidised coverage increased prenatal care utilisation among migrant women but was not associated with sustained reductions in mortality. These findings highlight the role of formal integration into national health systems in improving access in contexts of large-scale migration.
Funding
NIHR.
Date Issued
2026-11-01
Date Acceptance
2026-08-07
Citation
The Lancet Regional Health - Americas, 2026, 63
ISSN
2667-193X
Publisher
Elsevier BV
Journal / Book Title
The Lancet Regional Health - Americas
Volume
63
Copyright Statement
© 2026 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Publication Status
Published
Article Number
101612
Date Publish Online
2026-08-27