Summary & Overview

CPT 0234U: Genomic Unity MECP2 Analysis via PCR-free WGS

CPT code 0234U identifies a proprietary genomic laboratory test — Genomic Unity® MECP2 Analysis from Variantyx Inc. — that uses PCR-free whole genome sequencing and algorithmic analysis to detect variants in the MECP2 gene, which are clinically relevant for disorders such as Rett syndrome. As a PLA code, 0234U is specific to a single manufacturer’s test and signals a unique, high-complexity diagnostic service in molecular genetics. Nationally, PLA CPT codes like 0234U matter because they enable distinct tracking, pricing, and coverage determinations for proprietary genomic assays.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find: an explanation of the clinical and laboratory context for the test; the typical site and service type for billing and operational planning; and guidance on what information is available versus missing. This publication outlines benchmarks and policy considerations relevant to proprietary genomic testing codes, summarizes payer coverage landscape where available, and describes clinical indications tied to MECP2 variant analysis. Data not available in the input are noted explicitly in relevant sections.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0234UCPTProprietary Laboratory AnalysesGenomic TestingWhole Genome SequencingMECP2Rett SyndromeMolecular DiagnosticsLaboratory Billing

Billing Code Overview

CPT code 0234U is a Proprietary Laboratory Analyses (PLA) code for the Genomic Unity® MECP2 Analysis from Variantyx Inc. The test evaluates the methyl CpG binding protein 2 (MECP2) gene for variants relevant to conditions such as Rett syndrome using a PCR-free whole genome sequencing (WGS) platform with algorithmic data analysis.

Service type: Genomic laboratory testing (proprietary WGS-based gene analysis)

Typical site of service: Clinical laboratory or reference diagnostic laboratory

Clinical & Coding Specifications

Clinical Context

A typical patient is a female child or adolescent presenting to a pediatric neurology or medical genetics clinic with global developmental delay, regression of acquired skills, characteristic hand stereotypies, slowed head growth, and/or loss of purposeful hand use — features suggestive of Rett syndrome or other MECP2-related disorders. The clinician documents a detailed history and neurological exam, orders diagnostic testing including genetic evaluation, and counsels the family on test purpose and specimen options (blood or saliva). A blood draw or saliva kit is collected in clinic or at an affiliated phlebotomy site and sent to Variantyx Inc. for the Genomic Unity® MECP2 Analysis. Laboratory processing uses a PCR-free whole genome sequencing (WGS) platform with algorithmic analysis focused on the MECP2 gene to detect sequence variants and structural changes relevant to diagnosis. Results are reported to the ordering clinician, who reviews variant interpretation, updates the medical record, provides genetic counseling, and coordinates cascade testing or management as indicated. Typical site of service includes outpatient hospital-based genetics or neurology clinic, freestanding outpatient laboratory specimen collection center, or an accredited clinical laboratory performing specialized genetic testing.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — default	Use when no specific modifier applies to the laboratory service.

Taxonomy Code	Specialty	Notes
207Q00000X	Pediatric Neurology	Pediatric neurologists commonly order genetic testing for developmental regression and suspected Rett syndrome.
2080P0207X	Clinical Geneticist (MD/DO)	Medical geneticists evaluate, order, and interpret specialized genomic tests including MECP2 analysis.
207L00000X	Pediatrician	General pediatricians often initiate evaluation and refer to genetics; they may order testing in coordination with specialists.
363A00000X	Laboratory Director/Clinical Molecular Geneticist	Laboratory specialists oversee sequencing, data analysis, and result interpretation in the testing laboratory.
207K00000X	Neurologist	Adult neurologists may order MECP2 testing for older patients with compatible phenotypes.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`F84.0`	Autistic disorder	Rett syndrome may be initially considered in the differential diagnosis of autism spectrum disorders with regression.
`R62.0`	Delayed milestone in childhood	Developmental delay is a common indication to pursue MECP2 testing.
`R62.50`	Unspecified lack of expected normal physiological development in childhood	Used when specific developmental domain delays prompt genetic evaluation.
`G91.9`	Hydrocephalus, unspecified (Note: limited relevance)	Data not available in the input.
`A00.0`	Cholera due to Vibrio cholerae 01, biovar cholerae (Note: unrelated)	Data not available in the input.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`0234U`	Genomic Unity® MECP2 Analysis — PCR-free WGS platform analyzing the MECP2 gene	Primary PLA code for the proprietary MECP2 assay performed by Variantyx Inc.
`81161`	MECP2 (methyl CpG binding protein 2) gene analysis; full gene sequence analysis	Alternative or complementary molecular diagnostic code for MECP2 sequencing when a non-proprietary test is performed or for broader reporting.
`81432`	Molecular pathology procedure, Level 5 — constitutional single gene direct sequence analysis, large gene or full gene sequence, per gene	Used for high-complexity single-gene sequencing workflows that may accompany or be billed when non-PLA assays are used for MECP2.
`81329`	Methylation analysis, if applicable	Used when targeted methylation testing is performed to evaluate imprinting or methylation abnormalities relevant to differential diagnoses.
`36415`	Collection of venous blood by venipuncture	Common specimen collection CPT when blood is the chosen specimen for testing.
`99000`	Handling and/or conveyance of specimen to a laboratory	Used in some payer contexts for specialized specimen handling or courier services associated with genetic testing.