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CHCSP: Coding, Billing, and Reimbursement Compliance

CHCSP · Work through your exam, one topic at a time.

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Coding, Billing, and Reimbursement Compliance

Coding, Billing, and Reimbursement Compliance

This domain tests whether claims are supported by documentation, coded correctly, billed under the right payer rules, and corrected promptly when errors are found. Expect questions on modifiers, edits, medical necessity, overpayments, and charge capture.

Core rules

  • Medical necessity and documentation are the foundation: the service must be reasonable and necessary, ordered and performed as billed, and documented in the record. CPT, ICD-10-CM/PCS, and HCPCS codes must reflect the documented service.
  • NCCI includes procedure-to-procedure edits and medically unlikely edits. Modifier 59 or the X{EPSU} modifiers may bypass an edit only when documentation supports a distinct service; modifier 25 is for a significant, separately identifiable E/M service on the same day as a procedure.
  • Coverage determinations include national coverage determinations, local coverage determinations, and payer policies. An advance beneficiary notice may be used for certain potentially non-covered items, but it does not excuse medical necessity errors.
  • Charge capture and the chargemaster must align with actual services, supplies, and revenue codes. Undercharge and overcharge are both compliance issues.
  • The 60-day overpayment rule requires identification and return of Medicare Parts A/B overpayments by the later of 60 days after identification or the applicable cost-report due date; the lookback is six years.
  • Teaching physician, incident-to, supervision, and signature requirements are frequent audit findings.

Worked example

A claim bills a level-4 E/M visit and a minor procedure with modifier 25. The note documents the procedure but the E/M section only repeats the procedure history. Reasoning: modifier 25 is unsupported because no significant, separately identifiable E/M service is documented. Remove the E/M charge, quantify the overpayment, refund it within the required timeframe, and educate the clinician on documentation. If the E/M were separately documented, the modifier could be appropriate subject to NCCI edits.

Traps that cost marks

  • Using modifier 59 when a more specific X{EPSU} modifier applies.
  • Assuming an LCD applies nationwide.
  • Billing cloned or templated documentation without clinical support.
  • Missing physician signatures or authentication.
  • Treating credit balances and unidentified payments as revenue rather than potential overpayments.