"All results of Ms Kirdyapkina since 25 February 2011 were disqualified through to 11 October 2013, including forfeiture of any titles, awards, medals, points and prize and appearance money obtained during this period," CAS said in a statement.
Kirdyapkina, who retired from competition in 2015, loses her second-place finishes at the 2013 and 2011 world championships. The decision also brought her a three-year suspension which expires in 2020.
Kirdyapkina originally won bronze in 2011 but was raised to second place when fellow Russian Olga Kaniskina, who had taken gold, was suspended for doping.
Kirdyapkina's husband, race walker Sergey Kirdyapkin, won gold in the 50km at the 2012 Olympics in London but was later stripped of his medal for doping.
Russia's athletics federation has been suspended since a 2015 report commissioned by the World Anti-Doping Agency (WADA) found evidence of state-sponsored doping in the sport.
Global athletics ruling body the IAAF has still authorised some Russians, including 2015 world champion hurdler Sergey Shubenkov, to compete as neutrals after having demonstrated they are competing in a doping-free environment.
(Reporting by Gabrielle Tétrault-Farber,; Editing by Ed Osmond)
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