The Bath forward was cited for striking England captain Lawrence Dallaglio on the head with his knee during a English Premiership match against Wasps.
Borthwick's suspension will run from February 10 to February 23, meaning he cannot be considered for England's RBS 6 Nations appointment with Scotland at Murrayfield.
Borthwick, who lost his place on the bench for England's trip to Rome last weekend as a result of the citation, will not appeal against the ban following a two-hour hearing in Coventry.
Borthwick, 24, was found guilty of the offence by a three-man disciplinary panel.
His next appearance, for club or country, is now likely to be Bath's English Cup quarter-final against Leeds at Headingley.