The present investigation of the Medilaser Clinic in the city of Florence; sample, in a retrospective descriptive study, of the analysis of the generation of glosses in the semester of April-September 2014, in the surgery service; The compilation of information was made with the medical records that had some type of gloss, secondary sources obtained from medical records that describe the forms that the gloss is generated and the failures that caused them; In addition, a survey was applied to the administrative staff of the billing department to find reasons for the glosses such as: lack of authorization of procedures, gloss of the procedure for not being described in the surgical report, lack of epicrisis support, overbilling, invoice belongs to other payer, relevance not described and higher value charged. In most medical records there are glosses for minimum amounts, costs ranging from fifty pesos to five eighty thousand pesos, which would seem insignificant but in volume they become financially representative amounts. The survey helped to detect the lack of knowledge of the correct completion of forms, the lack of support in systematic tools due to lack of updates in the programs; The staff recognizes the importance of generating the Prefecture since there is a decrease in errors with its preparation; A continuous improvement plan was carried out, which will help mitigate shortcomings with proposals to minimize the reasons that generate glosses by a number.