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Letter of Medical Necessity Charcot-Marie-Tooth Disease (CMT) Advanced Evaluation—Comprehensive FORMTEXT <Date>ATTN: FORMTEXT <Medical Director/ Physician Name>, MD FORMTEXT <Institution/Insurance Company> FORMTEXT <Street Address> FORMTEXT <City>, FORMTEXT <State> FORMTEXT <Zip>RE: FORMTEXT <Patient Name>DOB: FORMTEXT <MM/DD/YYYY>Member ID: FORMTEXT <Insurance ID Number>Group #: FORMTEXT <Enter Group #>Dear Medical Director:I am writing on behalf of my patient FORMTEXT <Patient Name> to request coverage for the Charcot-Marie-Tooth Disease (CMT) Advanced Evaluation – Comprehensive test. I have determined that this test is medically necessary because of the following aspects of my patient’s history: FORMTEXT <Patient Name> is a FORMTEXT <age> -year-old FORMTEXT <gender > with a suspected diagnosis of CMT due to the following symptoms and clinical findings:1. FORMTEXT <Symptom #1 with ICD-9 code>2. FORMTEXT <Symptom #2 with ICD-9 code>3. FORMTEXT <Symptom #3 with ICD-9 code>< Add additional details if relevant > The patient’s family history of polyneuropathy is <negative or unknown; add additional details if relevant>. <Select one: The findings of electromyography and nerve conduction velocity studies are uninformative; or electrodiagnostic testing was not performed (specify reasons not performed)>. Additionally, all other metabolic, infectious, autoimmune, and toxic etiologies have been ruled out. The lack of a specific etiology suggests that genetic testing may help diagnose the cause of the polyneuropathy.Rationale for TestingCMT, the most common inherited peripheral neuropathy, comprises a group of chronic motor and sensory polyneuropathies that may manifest with distal muscle weakness and atrophy, mild to moderate sensory loss, depressed tendon reflexes, and high arched feet (pes cavus). The clinical diagnosis is generally based on the findings of physical examination, electromyography (EMG), nerve conduction velocity (NCV) testing, and family history. Genetic testing is useful for accurate diagnosis and classification of hereditary forms of polyneuropathy such as CMT.PFJlZm1hbj48Q2l0ZT48QXV0aG9yPkhpcm9zZTwvQXV0aG9yPjxZZWFyPjIwMTM8L1llYXI+PFJl

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ADDIN EN.CITE.DATA 1 Testing for the underlying genetic aberration is complicated by the large number of genes associated with CMT and the heterogeneity of the disease. Mutations in at least 28 genes have been associated with CMT.1 Traditional Sanger sequencing-based detection of individual mutations can be time consuming and costly when testing for mutations in large numbers of genes. Next-generation sequencing (NGS), on the other hand, allows sequencing of numerous genes simultaneously. Thus, NGS targeted at disease-associated genes seems appropriate for detecting mutations in disorders with a highly heterogeneous genetic background, such as CMT. Because the frequency of specific mutations varies with inheritance pattern, phenotype, and electrodiagnostic findings, these features are used to guide the selection of genetic tests.1 The CMT Advanced Evaluation—Comprehensive test is designed to identify the genetic cause of CMT in patients whose family history is negative or not available (possibly due to mild subclinical expression, autosomal recessive inheritance, or de novo mutation) or in whom electrodiagnostic testing is contraindicated, refused, or uninformative. This test begins with multiplex ligation-dependent probe amplification (MLPA) to detect the most common genetic cause of CMT (PMP22 duplication or deletion). If MPLA results are negative, NGS is performed to detect mutations in 23 genes that have been associated with CMT; mutations identified by NGS will be confirmed by Sanger sequencing. The genes evaluated and the targeted exome approach are based on the American Academy of Neurology (AAN) practice parameter1 and the American College of Medical Genetics guidelines. PFJlZm1hbj48Q2l0ZT48QXV0aG9yPkhpcm9zZTwvQXV0aG9yPjxZZWFyPjIwMTM8L1llYXI+PFJl

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ADDIN EN.CITE.DATA 2 Results from the test will be used to confirm the diagnosis of CMT in this patient and to guide appropriate medical care. Specifically, the results may:Inform treatment decisions; for example: Selection of appropriate treatment options.PFJlZm1hbj48Q2l0ZT48QXV0aG9yPkhpcm9zZTwvQXV0aG9yPjxZZWFyPjIwMTM8L1llYXI+PFJl

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ADDIN EN.CITE.DATA 4,5Avoidance of medications that are 1) contraindicated because they could exacerbate symptoms3; or 2) likely to be ineffective (eg, immunotherapy for autoimmune peripheral neuropathy, which may present with features suggestive of CMT).Help avoid a long series of laborious and potentially costly diagnostic procedures. Provide information useful for family planning.The reflex test approach could minimize the cost of testing by looking for the most common genetic cause of CMT (PMP22 duplication/deletion) first, as described in the AAN practice parameter.1In summary, I am requesting that FORMTEXT <Patient Name> be approved for the CMT Advanced Evaluation—Comprehensive test : test code 4001 offered by Athena Diagnostics. The CPT code for Step 1 is 81324. The CPT codes for Step 2, performed if the results of MPLA are negative, are 81325, 81403, 81404 (x3), 81405 (x5), 81406 (x5), and 81479. I hope you will support my decision to perform CMT genetic testing for this patient. Please feel free to contact me at FORMTEXT <Physician Phone> if you have additional questions.Sincerely, FORMTEXT <Physician Name>, MDNPI #: FORMTEXT <Physician NPI#>Contact information: FORMTEXT < Address> FORMTEXT <City>, FORMTEXT <State> FORMTEXT <Zip>Contact Phone No.: FORMTEXT <phone number>References ADDIN REFMGR.REFLIST 1. England JD, Gronseth GS, Franklin G, et al. Practice parameter: evaluation of distal symmetric polyneuropathy: role of laboratory and genetic testing (an evidence-based review). Report of the American Academy of Neurology, American Association of Neuromuscular and Electrodiagnostic Medicine, and American Academy of Physical Medicine and Rehabilitation. Neurology. 2009;72:185-192. 2. ACMG Board of Directors. Points to consider in the clinical application of genomic sequencing. Genet Med. 2012;14:759-761.3. Weimer LH, Podwall D. Medication-induced exacerbation of neuropathy in Charcot Marie Tooth disease. J Neurol Sci. 2006;242:47-54.4. Casasnovas C, Cano LM, Alberti A, et al. Charcot-Marie-tooth disease. Foot Ankle Spec. 2008;1:350-354.5. Chan G, Bowen JR, Kumar SJ. Evaluation and treatment of hip dysplasia in Charcot-Marie-Tooth disease. Orthop Clin North Am. 2006;37:203-209, vii. ................
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