Seguro Popular is one of Mexico's public health plans.
Article 4 of the Mexican constitution guarantees access to public health care to all temporary & permanent residents of Mexico (expats with residency visa).
As of May, 2019; many cities in Mexico have suspended Seguro Popular enrollment for temporary & permanent residents.
To date, there is no indication of whether this will be a permanent or temporary suspension.
Current Seguro Popular members in these cities whose plans are coming up for renewal will need to provide proof of citizenship (naturalization papers) in order to renew their membership.
Many Seguro Popular members as well as Individuals who are moving to Mexico may need to consider other options.