According to INEGI, 17.3% of total population in 2015 was not covered by health insurance (INEGI, 2015a). People who are not affiliated to any social security institution (IMSS, ISSSTE, etc.) or public insurance mechanism (Seguro Popular) by law could access MoH services. However, it is frequent that only in the case of acute problems (heart attack) or accidents they would access these and most likely solve minor issues within the private sector, such as consultations within pharmacies in the private sector or private sector physicians, which can be found in most places, but this doesn’t necessarily equal optimal and quality care.

References:

INEGI. (2015a). Encuesta Intercensal 2015 Estados Unidos Mexicanos. Instituto Nacional de Estadística y Geografía, 1, 85–90.