According to Jim (2001)

S06E11 In Case of Jimergency

Following a heated dispute with a claims agent regarding his medical bill, Jim's health insurance policy is abruptly terminated. Determined to keep this information from Cheryl, he manages to conceal the situation. However, when Cheryl falls ill and passes her cold to him, Jim's secret begins to unravel, forcing him to confront the consequences of his choice to hide the truth.