interqual-how-insurers-use-clinical-criteria-to-deny-claims">What Is InterQual? How Insurers Use Clinical Criteria to Deny Claims

InterQual is a set of evidence-based clinical decision-support criteria published by Change Healthcare (now part of Optum). Insurers and utilization review organizations use InterQual to evaluate whether a proposed medical service — a hospital admission, surgery, imaging study, or skilled nursing stay — meets the criteria for coverage as "medically necessary."

If your claim was denied with language like "does not meet InterQual criteria" or "clinical guidelines not met," InterQual was almost certainly involved in the decision. Understanding what that means — and how to fight back — is essential.

What InterQual Criteria Actually Are

InterQual criteria are published annually and are organized by care category:

• Acute care (inpatient hospitalization)
• Behavioral health (mental health and substance use)
• Ambulatory care (outpatient procedures)
• Home care
• Long-term acute care and skilled nursing
• Rehabilitation

Each set of criteria lists specific clinical indicators — lab values, functional status, vital signs, diagnoses, symptom severity — that must be present to justify a particular level of care. Reviewers check a patient's clinical record against these benchmarks and issue an approval or denial based on whether the indicators are met.

The Problem: Criteria as a Denial Tool

InterQual was designed as a clinical support tool, not a coverage determination tool. But insurers frequently use it as if meeting the criteria is the only valid basis for approval, and failing to meet them is automatic grounds for denial.

This approach has serious flaws:

InterQual criteria are not the standard of care. Your treating physician applies clinical judgment, patient history, comorbidities, and individualized factors that no algorithm can fully capture. A treating physician's recommendation carries significant legal and medical weight that a criteria checklist does not.

Criteria are updated annually and may lag behind evidence. If your condition or treatment is newly emerging or outside the mainstream, InterQual may not yet reflect current clinical consensus. You can challenge a denial by submitting peer-reviewed literature that supports the medical necessity of your care.

Criteria application errors occur frequently. Reviewers may apply the wrong version of InterQual, the wrong care category, or fail to consider all available clinical documentation. These errors can result in wrongful denials.

Your Right to Know What Criteria Were Applied

Under the ACA and ERISA, when an insurer denies a claim based on clinical criteria, they must provide you — upon request — with the specific criteria used in the determination. This includes the relevant InterQual edition, the specific criteria set, and the indicators that were not met. If your insurer refuses to provide this information, that is itself a violation of federal disclosure requirements.

Request this documentation in writing as soon as you receive a denial. You will need it to build your appeal.

How to Challenge an InterQual-Based Denial

Step 1: Request the full denial rationale. Get the specific InterQual criteria that were applied, the criteria version, and what clinical information the reviewer had access to. Ask whether the denial was issued by a nurse reviewer or a physician — many denials go through non-physician reviewers before a physician review is triggered.

Step 2: Obtain your physician's clinical documentation. Ask your treating doctor to write a detailed letter of medical necessity. This letter should directly address the InterQual criteria that were not met and explain, with clinical reasoning, why the care was still medically necessary given your specific circumstances.

Step 3: Request peer-to-peer review. Before filing a formal appeal, your treating physician may be able to speak directly with the insurer's medical director. Peer-to-peer reviews frequently result in overturned denials. This step costs nothing and should always be attempted.

Step 4: File a formal internal appeal. Submit your physician's letter, your medical records, and any supporting clinical literature. Clearly state that the InterQual criteria do not constitute the exclusive standard for medical necessity under your plan, and that the denial improperly substituted a coverage tool for a clinical judgment.

Step 5: Request External Independent Review: Complete Guide" class="auto-link">external review. If the internal appeal fails, request an independent external review. External reviewers are not bound by InterQual — they apply the overall medical necessity standard, and overturn rates on external review are substantial.

The Treating Physician Standard

Courts and regulators have consistently held that insurance companies cannot reflexively override a treating physician's recommendation in favor of a utilization review tool. If your insurer denied care that your doctor prescribed as necessary for your condition, that denial deserves a challenge.

Fight Back With ClaimBack

If your claim was denied because it "did not meet InterQual criteria," do not accept that decision without a fight. ClaimBack helps you draft a physician-supported, regulation-backed appeal that addresses the specific criteria used in your denial.

Start your appeal at ClaimBack

Related Reading

• What Is Utilization Review?
• What Is Medical Necessity?
• Internal vs. External Insurance Appeal: Which Should You File?