Glycosylated Hemoglobin A1C: Medical Necessity Denials

Published 02/08/2018

Denial Reason, Reason/Remark Code(s)
  • CO-50: These are non-covered services because this is not deemed a 'medical necessity' by the payer
  • CPT code: 83036
CMS has established national guidelines related to lipid panels as a National Coverage Determination (NCD), which were effective January 1, 2003. The most important step you can take is to check the NCD guidelines before you submit a claim.

NCDs apply to all Medicare fee-for-service contractors and provide a uniform set of instructions for processing claims for these services. NCDs for these tests specify:
  • Indications: in what circumstances is the test considered 'medically necessary'?
  • Limitations: in what circumstances is the test contraindicated? Are there frequency parameters for Medicare coverage?
  • CPT or HCPCS codes included in the NCD
  • Diagnosis codes covered by the Medicare program
Other Facts about Clinical Laboratory Tests
  • The complete NCD for hemoglobin A1C tests is available on the CMS website and in the CMS NCDs manual (Pub. 100-03, Part 3, Section 190.21)
  • Refer to the Medicare NCDs Coding Policy Manual and Change Report for information regarding:
    • Specific CPT and HCPCS codes included in the NCD
    • Covered diagnosis codes (part of the 'laboratory edit module')
    • Diagnosis codes that are 'never covered' for any laboratory NCD
    • You may also download the entire Lab Code List from this web page
  • The covered diagnosis code list changes as often as quarterly for these NCDs; the list may differ depending upon the date of service
  • The diagnosis code reported on the claim must be the most specific code available that accurately reflects the primary reason the test was ordered/performed
  • The patient's medical record must support the use of the diagnosis code(s) reported on the claim
  • Certain diagnosis codes are designated as 'never covered' by Medicare
  • NCDs exist for other clinical laboratory tests

Advance Beneficiary Notice (ABN) Information

  • Be aware of coverage restrictions before you submit a claim. If Medicare will not cover the test based on the patient's condition, you may ask the patient to sign an ABN. For more information on ABNs, refer to the Beneficiary Notice Initiative page on the CMS website.
  • ABSs must be issued using the standard CMS form. Access the revised ABN and other background information from the CMS website.
  • If you have obtained a valid ABN, submit claims for this service with HCPCS modifier GA. Refer to the Palmetto GBA Modifier Lookup tool under Self Service Tools for information on HCPCS modifier GA

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