[hydroxymethylglutaryl-CoA reductase (NADPH)]-phosphatase activity
[hydroxymethylglutaryl-coa reductase (nadph)]-phosphatase activity
Catalysis of the reaction: H2O + [hydroxymethylglutaryl-CoA reductase (NADPH)] phosphate = phosphate + [hydroxymethylglutaryl-CoA reductase (NADPH)].