Changes to benefits for sick and disabled people have led to a "fiasco", causing unnecessary distress to thousands of people, MPs have warned.
The Public Accounts Committee said the new Personal Independence Payment scheme had been "rushed" through, with a "shocking" impact on claimants.
"Many" faced six-month delays, with terminally ill people waiting a month on average for the payment, it said.
Ministers defended the system and said the MPs' figures were out of date.
New claims for the Personal Independence Payment (PIP) - which replaces the Disability Living Allowance (DLA) - began in April 2013. They are worth between £21 and £134 a week.
Most people applying for PIP have a face-to-face assessment to determine eligibility, which have been carried out by the private contractors Atos Healthcare and Capita Business Services.
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