42 C.F.R. § 405.922 Time frame for processing initial determinations.
Title 42 - Public Health
The contractor issues initial determinations on clean claims within 30 days of receipt if they are submitted by or on behalf of the beneficiary who received the items and/or services; otherwise, interest must be paid at the rate specified at 31 U.S.C. 3902(a) for the period beginning on the day after the required payment date and ending on the date payment is made.
Title 42: Public Health
PART 405—FEDERAL HEALTH INSURANCE FOR THE AGED AND DISABLED
Subpart I—Determinations, Redeterminations, Reconsiderations, and Appeals Under Original Medicare (Part A and Part B)
Initial Determinations
§ 405.922 Time frame for processing initial determinations.

