Utilization Management and Medical Necessity
Deciding what is reasonable and necessary
Utilization management evaluates whether services are appropriate, necessary, and delivered in the right setting. A candidate must understand prospective, concurrent, and retrospective review, and the tools used: prior authorization, precertification, concurrent review, and retrospective audit. Know the concept of medical necessity as defined by payers and regulators: services that are reasonable, necessary, and consistent with the diagnosis and accepted standards of care.
Concepts to master
Understand level-of-care determinations (inpatient vs. observation vs. outpatient) and the criteria sets commonly referenced, such as InterQual or Milliman guidelines, while recognizing these are proprietary tools, not regulations. Know the two-midnight rule concept for inpatient admission and the role of the physician's order and certification. Familiarize yourself with discharge planning, readmission review, and the appeal rights that accompany adverse determinations.
Traps in questions
Distractors often equate medical necessity with physician preference or with the presence of a diagnosis. Another trap: assuming a proprietary criteria set is legally binding. Questions may also blur the line between a denial for lack of authorization and a denial for lack of medical necessity.
Rule of thumb
Medical necessity requires both a clinical rationale and documentation that the service is appropriate for this patient at this time. Worked example: a patient with stable chest pain is admitted as inpatient without meeting severity criteria; the reviewer may determine observation was appropriate, converting the stay and adjusting payment.