The rules that decide appeals, and the sentence that invokes each one

A denial has to name the specific plan provision, internal rule or guideline it relied on, and the plan must give you that rule and the whole claim file free of charge when you ask. A denial that cannot produce its criteria is procedurally defective, which is a ground of appeal in itself.

If a plan fails to follow the claims-procedure rules (wrong deadlines, missing disclosures, no qualified reviewer), you are treated as having exhausted its internal appeals and may go straight to external review or court. Minor, harmless errors do not count, but a pattern of them does.

An appeal of a medical-judgment denial must be decided by a health professional with appropriate training and experience in the field, who was not involved in the original denial and is not their subordinate, and the plan must identify the medical experts it consulted. Asking who reviewed the claim is often the fastest way to find a defective decision.

Since 2024, a Medicare Advantage plan must cover what Original Medicare covers under the same coverage rules, may use its own internal criteria only where Medicare's rules are not fully established, must make those criteria public with their evidence, and must decide medical necessity on the individual's circumstances. A denial that rests on a proprietary guideline where a national or local coverage determination exists is out of bounds.

Medicare covers skilled nursing and therapy to maintain a condition or slow decline, not only to improve it; the Jimmo settlement forbids denials based on an 'improvement standard' or a 'plateau'. Any letter that says the patient is 'not progressing' or has 'reached maximum benefit' is using the wrong test.

Under Medicare's rule, an inpatient admission is generally appropriate when the admitting physician expects the patient to need hospital care spanning at least two midnights, or when the procedure is on the inpatient-only list; Medicare Advantage plans must apply the same benchmark. Denials that reclassify a stay as 'observation' or 'outpatient' are appealed on this rule.

A plan that covers mental health or substance-use treatment may not apply prior authorization, step therapy, network rules or medical-necessity standards more stringently than it applies them to medical and surgical care, and it must produce a comparative analysis of those limits on request. Ask for the analysis; many denials cannot survive it.

Every Medicare Part D plan, and marketplace plans under the essential-health-benefit rule, must grant an exception to cover a non-formulary drug, charge a lower tier or waive step therapy when the prescriber states that the covered alternatives would be less effective or harmful for you. The prescriber's statement is the whole case; the appeal is the request done properly.

A plan must cover emergency services based on the symptoms a reasonable person would consider an emergency, not on the final diagnosis, and without prior authorization or in-network restriction. A denial that says 'the diagnosis was not an emergency' applies the wrong test.

Medicare Advantage plans must base medical-necessity decisions on the individual patient and may use software only as a tool, California requires a licensed physician to make any medical-necessity denial, and every ERISA and ACA plan must disclose the criteria it used. The lever is a written question: what tool, which criteria, which human.

After the plan's final internal denial, you can ask an independent review organisation to decide medical-necessity, appropriateness, setting, level-of-care, effectiveness and experimental determinations, at no meaningful cost, and its decision binds the plan. It is the step most denied patients never take.

When a Medicaid agency or managed-care plan reduces or ends a service you are already receiving, you can keep the service during the fair hearing by requesting the hearing before the effective date (or within ten days of the notice). Most people lose the service because nobody told them to ask quickly.

For emergency care, and for out-of-network clinicians at an in-network facility, the plan must pay at in-network cost-sharing and the provider cannot balance-bill you, with narrow notice-and-consent exceptions. If the bill or the denial comes from one of those situations, the argument is statutory, not clinical.

If the plan's network has no provider with the needed expertise within a reasonable distance or time, you can ask for a network-gap (single-case) exception so the out-of-network provider is paid at the in-network level; marketplace plans are also held to network adequacy standards. The request works best before the care, with the evidence that you looked.

When a delay could seriously jeopardise your life, health or ability to regain maximum function, or would subject you to severe pain, the plan must decide the claim within 72 hours and the appeal within 72 hours, and your treating clinician's judgment that the case is urgent binds the plan. Asking for expedited handling changes the clock.