Vladimir Mokhnev, the coach of 800-metre runner Stepanova, was found to have violated IAAF rules "relating to possession, trafficking and administration of banned substances", CAS said in a statement.
Middle-distance runner Anastasiya Bazdyreva, 24, also received a two-year suspension, backdated to August 2015, for "use or attempted use...Of a prohibited substance or a prohibited method".
Bazdyreva was one of five Russian athletes who the World Anti-Doping Agency recommended be banned for life after they were the subject of doping allegations in a documentary aired by German TV channel ARD last year.
Stepanova, along with husband Vitaly Stepanov, helped lift the lid on Russia's alleged state-sponsored doping programme but was excluded from the Rio Olympics and lives in hiding in the United States.
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