Grassley is not the first to point out the delay, which has been attributed to election-year politics. AARP, the AFL-CIO and 17 other healthcare advocacy groups sent a similar letter to the Office of Management and Budget last week.
Grassley wrote the Sunshine Act with former Sen. Herb Kohl (D-Wis.), and it passed as part of Obama's signature healthcare law.
The law requires that drug, device and biologic manufacturers tell federal health officials about payments and gifts to doctors. It also orders that an online database make payment disclosures available to the public.