ORDER

The Memorandum filed on October 17, 2003, is withdrawn and replaced with the Amended Memorandum filed concurrently with this order.

With the filing of the Amended Memorandum, Plaintiff-Appellant’s petition for panel rehearing is denied.

The mandate shall issue forthwith.

*905AMENDED MEMORANDUM***

Plaintiff-Appellant Sara Stewart appeals an order of the district court confirming an arbitration award in favor of DefendantAppellee Rocky Mountain Hospital and Medical Service d/b/a Blue Cross and Blue Shield of Nevada. The district court rejected Stewart’s argument that the Federal Arbitration Act was “reverse preempted” by the MeCarran-Ferguson Act and held that Nevada Revised Statute § 695B.181 could not be applied to invalidate the arbitration agreement.1 We have jurisdiction pursuant to 28 U.S.C. § 1291, and we affirm.

As the party who initially requested arbitration, Stewart has waived the right to challenge the enforceability of the arbitration provision pursuant to § 695B.181.2 See, e.g., Nghiem v. NEC Elec., Inc., 25 F.3d 1437, 1440 (9th Cir. 1994) (reasoning that the party’s “voluntary initiation of arbitration can be interpreted as waiver of any objection he may have had over the authority of the arbitrator”). Moreover, even if Stewart is not deemed to be the party who initiated arbitration, it is undisputed that, in 1999, she filed what she herself characterizes as a “strenuous opposition” to appellees’ motion to have her case referred to arbitration. It is also undisputed that, in opposing arbitration, Stewart did not assert that § 695B.181 permitted or required her complaint to be adjudicated in district court, notwithstanding the policy’s arbitration provision. Lastly, it is not disputed that Stewart first invoked § 695B.181 after participating fully in the arbitration and losing. She first made the argument in opposition to appellees’ motion to confirm the arbitration award. These circumstances further support our conclusion that Stewart waived her right to invoke § 695B.181.

We therefore do not reach the McCarran-Ferguson Act preemption issue. We decline to address Stewart’s equitable estoppel argument because she did not raise it below.3 See, e.g., Steam Press Holdings, Inc. v. Haw. Teamsters & Allied Workers Union, Local 996, 302 F.3d 998, 1005 (9th Cir. 2002) (stating the general rule that this court “will not consider arguments on appeal that were not properly raised at the lower court level”), cert. denied, 537 U.S. 1232, 123 S.Ct. 1354, 155 L.Ed.2d 196 (2003); A-1 Ambulance Serv., Inc. v. County of Monterey, 90 F.3d 333, 338 (9th Cir. 1996) (stating that an argument “must have been raised sufficiently for the trial court to rule on it” in order to be considered on appeal).

The order of the district court confirming the arbitration award is

AFFIRMED.