By Michael Perry, M.D. Foraminal narrowing, or foraminal stenosis, is a condition of the spine that can cause pain and other symptoms resulting from spinal nerve root compression. At every level of the spine, a pair of nerve roots runs through the spinal column via small openings called foramina (singular: foramen).
When claims are entered into the Medicare system, they are issued a tracking number known as the internal control number (âICNâ). The ICN is a 13-digit number assigned to each claim received by Medicare. The significance of the digits is as follows: 1  Digits 1-2: Indicate how the claim was submitted (electronically or via paper). 2  Digits 3-4: Indicate the calendar year in which the claim was received.
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