Write-Off

A write-off is a charge removed from accounts receivable because it can no longer be collected. Two categories of write-offs dominate medical billing operations: contractual write-offs are the difference between what was billed and the contracted allowed amount under the payer agreement (most CO-45 adjustments fall here — they are normal, expected, and not a sign of trouble). Bad-debt write-offs are amounts genuinely lost — patient balances that have aged past the collection threshold, denied claims that were never appealed within the deadline, claims that hit timely filing limits, and underpayments where the practice never pursued the difference. Bad-debt write-offs are the warning indicator. Per industry data, roughly 65% of denied claims are never resubmitted, representing $25-50 billion in legitimate provider revenue written off annually across the U.S. industry. Healthy practices keep total bad-debt write-offs below 3% of gross charges. Practices over 5% are leaving meaningful money on the table — typically traceable to denial-management failures (denials never appealed within payer deadlines), A/R follow-up gaps (claims aged past 180 days without contact), or eligibility-verification failures (services rendered to patients without active coverage). Write-off analysis is a key operational metric: pull the monthly write-off report, categorize by reason code, and treat any non-contractual write-off as recoverable revenue that needs an upstream prevention rule.