The Netherlands international was sent off with five minutes remaining of their 1-0 Bundesliga victory over Hannover on Saturday following a rash challenge on Manuel Schmiedebach.
A straight red card would normally only incur a three-game ban, however Huntelaar's suspension was extended after confronting referee Sascha Stegemann having been dismissed.
Huntelaar looked set to miss crucial league matches with Bayern Munich, Borussia Monchengladbach and Borussia Dortmund, but will now be available for the last of those fixtures after the DFB reduced his ban.
The new suspension, which started with Tuesday's 1-1 draw at Bayern Munich, is for four matches, with a further two suspended until January 30, 2016.
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