Due to your impressive GMAT score, there is no reason to have any concern in this area. The top business schools in America, Harvard, Stanford, Chicago and Wharton, have all accepted applicants with scores lower than yours.
Regarding your work experience, spend time whilst working on your CV to make your experience sound impressive and appealing to admission officers. Research traits that admission officers are looking for, there is plenty of information online, and try to apply some of these traits to your previous experience whilst writing your CV and preparing for your interview. Leadership skills are high on the list of important traits for admission officers, so be sure to you include your time volunteering.
Research the universities that offer the specific area that you want to go into as universities differ in the specializations that they offer. The UNC Kenan-Flagler School of Business offer a Master of Business Administration with a Specialization in Healthcare program and many other universities offer MBA in Healthcare Management programs (Wharton and Duke are two that come into mind). However, most universities offer some kind of Operations Management or Consulting specialty.
You can use this link to research more on MBA programs that specialize in healthcare
https://aringo.com/mba-health-care-mana ... alization/ or contact us for a free chances estimation on:
https://aringo.com/mba-process-registrationGOOD LUCK!