WASHINGTON — Congress’ chief budget officer is contradicting President Barack Obama’s oft-stated claim that seniors wouldn’t see their Medicare benefits cut under a health care overhaul.

The head of the nonpartisan Congressional Budget Office, Douglas Elmendorf, told senators Tuesday that seniors in Medicare’s managed care plans would see reduced benefits under a bill in the Finance Committee.

The bill would cut payments to the Medicare Advantage plans by more than $100 billion over 10 years.

Elmendorf said the changes would reduce the extra benefits that would be made available to beneficiaries.

Critics say the plans are overpaid, while supporters say they work well.

Obama says cuts to Medicare providers won’t reduce seniors’ benefits.

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