A N.J. hospital forgot to bill her coronavirus test. It cost her $1,980.

When Debbie Krebs got the bill for a March emergency room visit, she immediately noticed something was missing: her coronavirus test. Ms. Krebs, a lawyer who focuses on insurance issues, had gone to the Valley Hospital in Ridgewood, N.J., with lung pain and a cough. A doctor ran tests and scans to rule out other diseases before swabbing her nose. A week later, the medical laboratory called, telling her it was negative.