Influenza due to identified novel influenza A virus with other respiratory manifestations. 1  J09.X2 is a billable ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. 2  Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
Cavities take time to form. A person doesn't just get a cavity overnight. It typically takes months, or possibly even years, before the decay process has advanced to a point where it requires attention. (That's why your dentist feels comfortable enough only examining you every 6 months.)
If this is the only cause, expect the tooth to gradually get better, usually within a couple of days, but it can last for several months. As long as the tooth gradually improves, there should be no cause for concern. The decay could have been close to the pulp of the tooth.