Carmen Quintero works an early shift as a supervisor at a 3M distribution warehouse that ships N95 masks to a nation under siege from the coronavirus. On March 23, she had developed a severe cough, and her voice, usually quick and enthusiastic, was barely a whisper. A human resources staff member told Quintero she needed to go home. “They told me I couldn’t come back until I was tested,” said Quintero, who was also told that she would need to document that she didn’t have the virus. Her primary care doctor directed her to the nearest emergency room for testing because the practice had no coronavirus tests. Send Us Your Medical Bill Do you have an exorbitant or baffling medical bill? Join the KHN and NPR ‘Bill of the Month’ Club and tell us about your experience. We’ll feature a new one each month. Submit Your Bill The Corona Regional Medical Center is just around the corner from her house in Corona, California, and there a nurse tested her breathing and gave her a chest...