Also known as: collateral order · collateral order doctrine
Written by attorneys · grounded in primary & secondary sources — see below
An exception to the final judgment rule that permits immediate appellate review of certain interlocutory orders. The exception applies only when an order conclusively determines a disputed question, resolves an important issue completely separate from the merits, and would be effectively unreviewable after final judgment.
Helping Hands, a nonprofit, faces a discovery order requiring public disclosure of major donors' names and amounts on its website. The organization immediately appeals, claiming the order destroys associational privacy rights that cannot be restored after disclosure occurs. The appeal proceeds because the order finally resolves a right separate from the underlying misuse claims and leaves no effective remedy after final judgment.
Charles Cunningham sues federal officials for alleged constitutional violations. The district court denies a motion to dismiss for insufficient pleadings. The officials appeal immediately, arguing the ruling turns on an abstract legal question about pleading standards that stands apart from the underlying factual disputes.
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Cedar Creek Farms challenges a discovery order compelling production of privileged communications. The company appeals at once, asserting that the order finally resolves a claimed privilege that would be lost once the documents are disclosed and reviewed by opposing counsel, but review is denied because the privilege claim remains reviewable after final judgment.
Caitlin Crowley, a private litigant, obtains a discovery order against federal officials seeking internal executive documents. The officials appeal immediately, contending the order conclusively rejects a separation-of-powers claim that would be destroyed by compliance before final judgment.
Carlos Castillo, a police officer, moves for summary judgment on qualified immunity grounds in an excessive-force suit brought by Cynthia Cortez. The district court denies the motion on undisputed facts. Castillo appeals at once because the ruling conclusively rejects an immunity from suit that cannot be restored after trial.
Cody Callahan, a state trooper, is denied qualified immunity on summary judgment in a high-speed pursuit case brought by Coastal Shipping's driver. Callahan appeals immediately, asserting that the order resolves his claimed right not to stand trial on facts the district court treated as undisputed.
The order must conclusively determine the disputed question. It must resolve an important issue completely separate from the merits. It must be effectively unreviewable on appeal from a final judgment.
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Such denials conclusively reject a claimed right not to stand trial. The immunity question is separate from the underlying liability merits when based on undisputed facts. The protection from suit would be lost if review waited until after trial.
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The order qualifies when it finally resolves a claimed right, such as associational privacy or trade-secret protection, that stands apart from the merits. The right must be one that would be irretrievably destroyed by compliance before final judgment.
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Routine cost orders usually do not qualify because they remain reviewable after final judgment through standard cost-shifting mechanisms. The doctrine requires a right whose value would be destroyed by delay, not merely an ordinary procedural burden.
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…order was not an appealable "case" properly "in" the Court of Appeals within the meaning of § 1254. We do not agree. Under the "collateral order" doctrine of Cohen v. Beneficial Industrial Loan Corp. , 337 U. S. 541 (1949), a small class of interlocutory orders are immediately appealable to the courts of appeals. As defined by…