It depends on the incorrect information. If it is small group and an employee filled out the employee app incorrectly about health questions, and claims start coming in, they may adjust the rates on you. For example, Aetna can adjust rates within 30 days if something changes such as adding employees. If it is something like an incorrect SIC code, the undewriters will probably make the adjustment when they verify SIC with their D&B report.
Most likely, if it is a larger group and there is a gatekeeper questionnaire instead of individual medical questions, the medical issue will appear during the year and rates will be adjusted accordingly at renewal time.
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