Also known as: collateral order appeals · collateral-order appeal · collateral order doctrine · collateral order exception
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 on appeal from a final judgment.
Cedar Creek Farms moved in federal district court for an order requiring a shareholder plaintiff to post a substantial bond under state law to cover defense costs in a derivative action. The court denied the motion outright. Cedar Creek Farms filed an immediate appeal, arguing that the denial finally resolved its claimed statutory protection and that the right would be lost if review waited until after trial.
Coastal Shipping, a state-created entity, asserted Eleventh Amendment immunity in a contract suit brought by a private contractor. The district court denied the immunity claim. Coastal Shipping immediately appealed, contending that the denial resolved a claimed right to avoid suit altogether and that forcing litigation to final judgment would destroy the immunity.
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Cascade Manufacturing sought to withhold documents on attorney-client privilege grounds during discovery. The district court ordered production after finding the privilege waived. Cascade Manufacturing filed an immediate appeal, asserting that the order conclusively resolved an important privilege claim separate from the underlying contract dispute and that disclosure would cause irreparable harm.
Officer Connor Clark moved for summary judgment on qualified immunity in a civil rights action alleging excessive force. The district court denied the motion because genuine factual disputes remained. Clark immediately appealed, claiming the denial resolved his asserted right not to stand trial and that the protection would be lost once litigation proceeded.
A federal prosecutor moved to dismiss a damages suit on grounds of absolute immunity for actions taken in the course of a prosecution. The district court denied the motion. The prosecutor filed an immediate appeal, arguing that the order conclusively rejected a claimed right to avoid trial and that the immunity would be irretrievably lost if review occurred only after final judgment.
The State of State A moved to dismiss a suit brought by disabled plaintiffs alleging violations of federal accessibility laws. The district court denied the motion. The state immediately appealed, asserting that the denial resolved its claimed immunity from suit and that requiring the state to litigate to judgment would nullify the protection.
An 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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Denial of immunity from suit conclusively resolves a claimed right to avoid litigation. The right stands separate from the merits. Forcing the party to litigate to final judgment would destroy the protection, rendering later review ineffective.
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Most discovery orders do not qualify because any harm can be remedied after final judgment through sanctions or retrial. A protective order limiting use further reduces the likelihood that harm would be irreparable, so the order fails the unreviewability prong.
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The denial fails when the bond serves only as routine cost allocation rather than an immunity-like protection. The right remains reviewable after final judgment through ordinary cost-shifting mechanisms, so the order does not satisfy the effective unreviewability requirement.
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…entitled to absolute immunity. App. to Pet. for Cert. 1a-3a. Independently of former President Nixon, petitioners invoked the collateral order doctrine and appealed the denial of their immunity defense to the Court of Appeals for the District of Columbia Circuit. The Court of Appeals dismissed the appeal without opinion. Id. , at 11a-12a.…