Objective:

To determine the perspective of the beneficiaries regarding the quality of health service provided by the Instituto de Seguridad Social del Estado de México y Municipios (ISSEMyM).

Materials and methods:

Through a descriptive study which contemplates the application of the Scale of Quality Service in ISSEMyM Beneficiaries (ECALDER, Quality Scale of receiving service in users) to 355 beneficiaries who at least had one year with the assistance benefit within 10 different centers of the Institute.

Results:

The dissatisfaction with the quality of services is reported with low scores (percentile 36.79). The correlation analysis showed significant scores (p < 0.00) which indicated the inter-relationship of perceptions of the treatment with staff, elaboration of procedures and confidence in the institution.

Conclusions:

Factorial aspects of procedures and institutional trust are well evaluated, followed by interaction with staff; through the correlational approach, the general interaction with the staff, of any kind, influences the perception toward others, while confidence in the institution depends on the perception of nurses and formalities.