What are the Most Common Medical Billing Errors that Lead to Claim Denials?

The most frequent billing errors include incorrect patient demographics like misspelled names or wrong dates of birth, invalid insurance ID numbers, missing or incorrect provider information, coding errors such as using outdated CPT codes or mismatched diagnosis codes, and lack of required authorizations. Duplicate claim submissions also trigger denials, as do services billed beyond the timely filing deadline. Many denials stem from simple data entry mistakes that could be caught with proper quality control checks before submission.