Cite as: 511 U. S. 863 (1994)
Opinion of the Court
ling public policy rationale," the denial of which has been held to be immediately appealable. 993 F. 2d, at 758-760.1
The Tenth Circuit recognized that it was thus deviating from the rule followed in some other Courts of Appeals, see Forbus v. Sears, Roebuck & Co., 958 F. 2d 1036 (CA11 1992); Grillet v. Sears, Roebuck & Co., 927 F. 2d 217 (CA5 1991); Janneh v. GAF Corp., 887 F. 2d 432 (CA2 1989); but see Transtech Industries, Inc. v. A & Z Septic Clean, 5 F. 3d 51 (CA3 1993), cert. pending, No. 93-960. We granted certiorari, 510 U. S. 942 (1993), to resolve this conflict and now affirm.
II
A
The collateral order doctrine is best understood not as an exception to the "final decision" rule laid down by Congress in § 1291, but as a "practical construction" of it, Cohen, supra, at 546; see, e. g., Coopers & Lybrand, supra, at 468. We have repeatedly held that the statute entitles a party to appeal not only from a district court decision that "ends the litigation on the merits and leaves nothing more for the court to do but execute the judgment," Catlin v. United States, 324 U. S. 229, 233 (1945), but also from a narrow class of decisions that do not terminate the litigation, but must, in the interest of "achieving a healthy legal system," cf. Cobbledick v. United States, 309 U. S. 323, 326 (1940), nonetheless be treated as "final." The latter category comprises only those district court decisions that are conclusive, that resolve important questions completely separate from the merits, and that would render such important questions effectively unreviewable on appeal from final judgment in the underlying action. See generally Coopers & Lybrand, supra. Immediate appeals from such orders, we have ex-1 The Tenth Circuit also denied Digital's request to stay the District Court proceedings. We granted a stay pending our disposition of Digital's petition for certiorari. 510 U. S. 804 (1993).
867
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