An Institute of Medical Coding guide to understanding how accurate documentation supports sound coding decisions.
A rejected claim
A rejection commonly means the claim did not pass an initial data or format check. A missing identifier or invalid field can prevent it from being accepted for processing. The team reviews the rejection message, fixes the supported error and resubmits under the applicable workflow.
A denied claim
A denial generally occurs after the payer accepts and evaluates a claim but decides not to pay some or all of it. Reasons can include coverage, eligibility, authorization, coding or documentation. The payer’s actual reason code matters more than an assumption.
Why the distinction matters
Resending a denied claim unchanged may not solve the issue. Likewise, an appeal may be unnecessary for a simple submission rejection. The next action depends on the response, filing deadlines and payer rules.
A practical learning exercise
Create a two-column log: what the response says and what evidence is needed next. For every case, check the original claim, medical record and payer message before editing a code or billing field.
