What Is InterQual
InterQual is a proprietary clinical decision support system owned by Optum that insurance companies use to determine whether a medical service meets their definition of medical necessity. It contains evidence-based criteria for hospital admissions, emergency department visits, inpatient procedures, and length-of-stay decisions. When your insurer denies a claim, there's a strong chance they referenced InterQual criteria to justify that denial.
How Insurers Use It in Claim Decisions
Insurance companies apply InterQual criteria at several decision points. During prior authorization review, the insurer's nurse reviewer checks your case against InterQual's admission criteria. If your clinical presentation doesn't match the specific parameters in their system, they deny authorization upfront. After you receive care, the insurer applies the same logic to your EOB, sometimes denying payment retroactively. This happens even when your physician believed the admission was medically necessary and appropriate.
The criteria are tiered. For example, InterQual's acute care admission criteria might require specific test results, symptom severity scores, or vital sign thresholds. If your documentation shows you had a systolic blood pressure of 140 but InterQual's criteria specify 160 or higher for that condition, the insurer may claim you didn't meet their threshold, regardless of your doctor's clinical judgment.
Your Appeal Rights Against InterQual Denials
When InterQual criteria are cited in a denial, you have two appeal tracks. An internal appeal asks the same insurance company to reconsider. Request that they provide the specific InterQual criteria they used and explain how your clinical facts don't meet those criteria. Many internal appeals succeed because the initial reviewer made a documentation error or misapplied the criteria.
If internal appeal fails, file an external appeal with your state's independent review organization (IRO). This is critical: IROs are not bound by the insurance company's InterQual interpretation. They evaluate medical necessity based on medical necessity standards in your state and the treating physician's clinical judgment. Federal regulations (42 CFR 147.136) require insurers to provide you the InterQual criteria they used, which gives your external reviewer the exact standard to challenge.
What InterQual Cannot Override
InterQual is a tool, not law. Your physician's clinical judgment carries legal weight. If your doctor documents that you required inpatient care due to complications, altered mental status, or failed outpatient management, that clinical determination often outweighs a mechanical InterQual criteria check. State insurance regulations in many states require insurers to consider the treating provider's professional opinion, not just algorithm results. Document everything your doctor observed, any objective findings, and the clinical reasoning for inpatient versus outpatient treatment.
Common Questions
- Can I see the exact InterQual criteria the insurer used? Yes. Request them in writing during your appeal. The insurer must provide the specific criteria and how they applied them. This document is essential for your external appeal.
- Does InterQual apply to all insurers? Most major commercial insurers use Optum's InterQual or similar systems (Milliman, Cigna Pathways). Medicare uses different criteria. Ask your insurer directly what tool they use for medical necessity reviews.
- Can my doctor override an InterQual denial? Your doctor can request peer-to-peer review with the insurer's medical director and argue why your case warrants an exception. This conversation often succeeds because it puts clinician against clinician, not algorithm against patient.