Coding, Billing, and Claims Review
From documentation to claim
Coding translates documented clinical work into standardized codes. Reviewers must understand the structure of ICD-10-CM diagnosis coding (including specificity, laterality, and the distinction between principal and secondary diagnoses) and the logic of CPT and HCPCS procedure coding, including evaluation and management level selection, modifiers, and bundling edits. Know the purpose of the National Correct Coding Initiative edits, the concept of a global surgical package, and why medical necessity must link the procedure code to a supporting diagnosis.
Claims mechanics
Understand the claim form fields that matter to review: place of service, date of service, units, rendering and billing provider identifiers, and the diagnosis pointer. Know how a claim moves from submission through edits, adjudication, and payment, and what a remittance advice communicates.
Traps to watch
Common distractors include selecting a code based on the highest documented severity rather than the documented specificity, unbundling services that belong in a global package, and appending a modifier to bypass an edit without documented justification. Another trap is a diagnosis code that is clinically plausible but not supported anywhere in the note.
Rule of thumb
Code what is documented, to the highest level of specificity supported, then verify the diagnosis justifies the service. If the documentation supports a lower level than billed, the reviewer corrects downward; the claim follows the record, never the reverse.