L1CAM Gene Sequencing Coding and Billing Guidelines (CM00051)
Skip to main content


October 28, 2015 - Revised: 08.10.17

L1CAM Gene Sequencing Coding and Billing Guidelines (CM00051)

Effective for dates of service on and after January 29, 2013.

L1 syndrome refers to multiple disorders including X-linked hydrocephalus with aqueduct of Sylvius (HSAS) stenosis, MASA syndrome (Mental retardation, Aphasia, Spastic paraplegia, Adducted thumbs), SPG1 (X-linked complicated hereditary spastic paraplegia type 1), and X-linked complicated corpus callosum agenesis. Because there are many potential underlying causes for congenital hydrocephalus, including syndromic and nonsyndromic cases, recurrence risk and implications for family members is based upon underlying etiology. Genetic testing of the L1CAM gene is used to confirm a clinical diagnosis and provide recurrence risk. Therefore, the MolDX Team has determined L1CAM full gene sequencing is a statutorily excluded test.

To receive a L1CAM gene sequencing service denial, please submit the following claim information:

  • CPT code 81407 LICAM, full gene sequence
  • An Advance Beneficiary Notice (ABN) is not required for statutorily excluded services.
    • For a voluntary issued ABN, append with GX modifier
    • To indicate a valid ABN is on file for a known statutorily excluded service, append with a GY modifier
  • Select the appropriate diagnosis for the patient
  • Enter the DEX Z-code identifier adjacent to the CPT code in the comment/narrative field for the following claim field/types:
    • Part A: Loop 2300 NTE 01/SV202-7 (electronic claim); Form Locator 80 (paper claim)
    • Part B: Loop 2400 or SV101-7 (electronic claim); Item 19 (paper claim)

Reference: Sec. 1862 (1)(A) Statutory Exclusion covers diagnostic testing "except for items and services that are not reasonable and necessary for the diagnosis or treatment of illness or injury or to improve the functioning of a malformed body member…"

26 Century Blvd Ste ST610, Nashville, TN 37214-3685 © CGS Administrators, LLC. All Rights Reserved