Assignment of CLIA Identification Numbers

6008 - Assignment of CLIA Identification Numbers (Rev. 230; Issued: 07-11-25; Effective: 07-11-25; Implementation: 07-11-25) CLIA identification numbers are shown under the CMS Certification Number (CCN) column in certain CMS data systems. CLIA identification numbers are 10-digit alphanumeric numbers issued by the CLIA Data System. This is assigned at the time of initial entry of the CLIA application and included with the mailing of the remittance fee coupon. The 10-digit number consists of the following fields: • Positions 1 and 2 identify the State in which the laboratory was located when it initially applied for a CLIA certificate. (A laboratory that relocates to another State retains its original CLIA number.); • Position 3 is the alpha letter “D” to identify the provider/supplier as a laboratory certified under CLIA; and • Positions 4 through 10 are the unique facility number identifiers. Laboratories which are CLIA-exempt and those designated as VA laboratories do not have a CLIA certificate but are assigned a CLIA identification number. Once a laboratory is assigned a number, it retains this number even if it withdraws from CLIA, has its certificate revoked, changes its certificate type or ownership, location (i.e., relocates to another State), name, or operator. A CLIA number will not be reassigned to another laboratory.