what does icn stand for in medical billing
Friday, May 9, 2014. When claims are entered into the Medicare system, they are issued a tracking number known as the internal control number (âICNâ). The ICN is a 13-digit number assigned to each claim received by Medicare. For example, a claim has an ICN of 1114100351480. The third and fourth digits of the ICN are 14, indicating the claim was received in calendar year 2014.