Medical_Policy

Highmark Commercial Medical Policy - Pennsylvania

Medical Policy:	L-126-006
Topic:	Fragile X Syndrome Testing
Section:	Laboratory
Effective Date:	July 1, 2018
Issue Date:	July 2, 2018
Last Reviewed:	March 2018

Fragile X syndrome is the most common cause of inherited intellectual disability affecting approximately 1 in 4,000 males and 1 in 8,000 females. Because the mutation is on the X-chromosome, males tend to be more often and more severely affected than females.

This policy is designed to address medical guidelines that are appropriate for the majority of individuals with a particular disease, illness, or condition. Each person's unique clinical circumstances may warrant individual consideration, based on review of applicable medical records.

Policy Position Coverage is subject to the specific terms of the member’s benefit plan.

Targeted Mutation Analysis for CGG Trinucleotide Repeat Expansion in FMR1 may be considered medically necessary when the following specific criteria are met:

Genetic Counseling:

Pre and post-test genetic counseling by an appropriate provider; and

Previous Genetic Testing:

No previous molecular genetic testing of FMR1; and

Diagnostic Testing for Symptomatic Individuals:

Males and females with unexplained speech and/or language delay, motor development delay, intellectual disability (ID), or autism; or
Female with premature ovarian failure (cessation of menses before age of 40 years); or
Males and females greater than or equal to 50 years with progressive intention tremor and cerebellar ataxia of unknown origin; or

Prenatal Testing for At-Risk Pregnancies:

CGG trinucleotide repeat expansion in FMR1 identified in biologic mother*; or

Carrier Screening and Predictive Testing for Presymptomatic/Asymptomatic At Risk Individuals

Known CGG trinucleotide repeat expansion in FMR1 in 1st, 2nd, or 3rd degree biologic relative; or
Family history of premature ovarian failure (cessation of menses before age of 40 years); or
Family history of movement disorder; and

Cerebellar ataxia has been ruled out
Other movement disorders have been ruled out; or

Family history of undiagnosed intellectual disability; or
Prior cytogenetic test suspicious for fragile X; and

Possibility of X-linked inheritance has not been ruled out by male to male transmission.

Procedure Codes

81243

Methylation Analysis may be considered medically necessary when the following specific criteria are met:

Genetic Counseling:

Pre and post-test genetic counseling by an appropriate provider; and

Previous Genetic Testing:

CGG expansion analysis result showing a premutation or full allele size (typically greater than 55 repeats); and

Diagnostic Testing for Symptomatic Individuals:

Males and females with unexplained speech and/or language delay, motor development delay, intellectual disability (ID), or autism; or
Female with premature ovarian failure (cessation of menses before age of 40 years); or
Males and females greater than or equal to 50 years with progressive intention tremor and cerebellar ataxia of unknown origin; or

Prenatal Testing for At-Risk Pregnancies:

CGG trinucleotide repeat expansion in FMR1 identified in biologic mother.*

Procedure Codes

81244

* Note: CVS must be interpreted with caution. The number of CGG repeats in the fetus can be accurately determined; however, often the methylation status of FMR1 is not yet established in chorionic villi at the time of sampling. CVS results may lead to a situation in which follow-up amniocentesis is necessary to resolve an ambiguous result.

Professional Statements and Societal Positions

Consensus guidelines from the American Academy of Pediatrics (AAP, 2011) that address health supervision of fragile X syndrome:

Because children with fragile X syndrome may not have apparent physical features, any child who presents with developmental delay, borderline intellectual abilities, or mental retardation or has a diagnosis of autism without a specific etiology should undergo molecular testing for fragile X syndrome to determine the number of CGG repeats...Fragile X testing should also be considered in patients in whom there is suspected, but not molecularly proven, Sotos syndrome or Prader-Willi syndrome. On the other hand, fragile X testing, is not routinely warranted for children with isolated attention-deficit/hyperactivity disorder.

Practice guidelines from the American College of Medical Genetics (ACMG, 2005) recommend diagnostic testing for fragile X syndrome for Individuals of either sex with mental retardation, developmental delay, or autism, especially if they have (a) any physical or behavioral characteristics of fragile X syndrome, (b) a family history of fragile X syndrome, or (c) male or female relatives with undiagnosed mental retardation.

Practice guidelines from the American College of Medical Genetics (ACMG, 2005) and the American College of Obstetricians and Gynecologists (ACOG, 2010) support carrier screening for fragile X syndrome:

ACMG: Individuals seeking reproductive counseling who have (a) a family history of fragile X syndrome or (b) a family history of undiagnosed mental retardation.
ACOG: Women with a family history of fragile X-related disorders, unexplained mental retardation or developmental delay, autism, or premature ovarian insufficiency are candidates for genetic counseling and fragile X premutation carrier screening.

Practice guidelines from the American College of Medical Genetics (ACMG, 2005) and the American College of Obstetricians and Gynecologists (ACOG, 2010) support prenatal screening for fragile X syndrome:

ACMG states that fragile X testing is appropriate in Fetuses of known carrier mothers.
ACOG: Prenatal testing for fragile X syndrome by amniocentesis or CVS should be offered to known carriers of the fragile X premutation or full mutation. Although amniocentesis and CVS are reliable for determining the number of triplet repeats, CVS may not adequately determine the methylation status of the FMR1 gene.

Place of Service: Outpatient

Fragile X syndrome testing is typically an outpatient procedure which is only eligible for coverage as an inpatient procedure in special circumstances, including, but not limited to, the presence of a co-morbid condition that would require monitoring in a more controlled environment such as the inpatient setting.

The policy position applies to all commercial lines of business

Denial Statements

Services that do not meet the criteria of this policy will not be considered medically necessary. A network provider cannot bill the member for the denied service unless: (a) the provider has given advance written notice, informing the member that the service may be deemed not medically necessary; (b) the member is provided with an estimate of the cost; and (c) the member agrees in writing to assume financial responsibility in advance of receiving the service. The signed agreement must be maintained in the provider’s records.

A network provider can bill the member for the non-covered service.

Links

Link to Provider Resource Center for the Medical Policy Update

05/2018, REMINDER: Molecular and Genomic Testing

Link to References

Medical policies do not constitute medical advice, nor are they intended to govern the practice of medicine. They are intended to reflect Highmark's reimbursement and coverage guidelines. Coverage for services may vary for individual members, based on the terms of the benefit contract.

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U.S. Department of Health and Human Services
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