Summary & Overview
CPT 0237U: Genomic Unity Cardiac Ion Channelopathies Analysis
Headline: New CPT code 0237U identifies a proprietary whole genome sequencing test for cardiac ion channelopathies
Lead: CPT code 0237U designates the Genomic Unity® Cardiac Ion Channelopathies Analysis by Variantyx Inc., a proprietary laboratory test that uses PCR-free whole genome sequencing on blood or saliva to evaluate 10 genes for variants associated with cardiac ion channel disorders and arrhythmia risk. The code signals growing use of WGS-based assays in clinical cardiogenetics and has implications for coverage, testing pathways, and laboratory billing nationally.
What this code represents and why it matters: CPT code 0237U codifies a single-manufacturer genomic assay that targets inherited cardiac ion channelopathies. As precision diagnostics expand, PLA codes like 0237U standardize claims reporting for complex genomic services and help payers and providers track utilization of high-complexity laboratory testing.
Key payers covered: Analysis in this publication focuses on national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Federal Medicare programs.
What readers will learn: The report provides benchmarks for clinical and billing classification of PLA genomic tests, explains the clinical context for cardiac ion channelopathy testing, outlines payer considerations and common modifiers, and summarizes expected sites of service and specimen types. Data not available in the input is clearly identified where applicable.
Billing Code Overview
CPT code 0237U is a Proprietary Laboratory Analyses (PLA) code for the Genomic Unity® Cardiac Ion Channelopathies Analysis manufactured by Variantyx Inc. The test uses a blood or saliva specimen and employs a PCR-free whole genome sequencing (WGS) platform with algorithmic data analysis to evaluate the 10 genes listed in the code for variants relevant to cardiac ion channelopathy conditions. These conditions are genetic disorders affecting cardiac ion channel function that can alter the heart's electrical signals and lead to arrhythmias.
Service type: Clinical laboratory genetic testing using PCR-free whole genome sequencing with algorithmic variant analysis.
Typical site of service: Clinical laboratory or reference genetic testing laboratory; specimen collection occurs at outpatient collection sites or clinical offices where blood or saliva specimens are obtained.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred by a cardiologist or genetic counselor for evaluation of suspected inherited cardiac ion channelopathy (for example, long QT syndrome, Brugada syndrome, catecholaminergic polymorphic ventricular tachycardia) after syncope, documented unexplained ventricular arrhythmia, family history of sudden cardiac death, or abnormal ECG findings. The ordering clinician collects a blood or saliva specimen in clinic or a designated phlebotomy/ambulatory collection site. Specimen is shipped to the performing laboratory (Variantyx Inc.) for PCR-free whole genome sequencing with algorithmic variant analysis limited to the 10 genes specified in the proprietary Genomic Unity® Cardiac Ion Channelopathies Analysis. Results are returned to the ordering clinician and integrated into the patient’s electronic health record; results may prompt cascade testing of family members, changes in medication, device therapy consideration, or further specialist consultation. Typical sites of service include outpatient cardiology clinics, genetic counseling centers, ambulatory phlebotomy centers, and hospital outpatient laboratories. Service type: Proprietary Laboratory Analysis (PLA) — clinical diagnostic genetic test performed by a single laboratory/manufacturer using blood or saliva specimen.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (standard reporting) | Use when no special modifier applies and reporting the PLA service as usual. |
26 | Professional component | Use when reporting only the professional (interpretation) component separate from technical processing when allowed. |
52 | Reduced services | Use when the laboratory test is partially performed or a reduced service is delivered compared with the full test. |
53 | Discontinued procedure | Use if testing was started but discontinued for patient- or specimen-related reasons. |
62 | Two surgeons or primary providers | Rare for lab testing; use when two qualified independent providers share primary responsibility for interpretation in a complicated consultative context. |
78 | Unplanned return to the operating/procedure room | Uncommon; may be reported when unexpected re-intervention necessitates repeat or urgent specimen collection tied to the same operative episode. |
80 | Assistant surgeon | Not routine for lab tests; may apply if an assisting provider participates in specimen acquisition within an operative setting when billing rules permit. |
82 | Assistant surgeon (when qualified resident not available) | As above, only when documenting assisting provider role where applicable. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist | Use to identify services performed by these non-physician practitioners when allowed by payor policy. |
QK | Medical direction of two, three, or four technicians/technologists | Use when the physician provides medical direction over multiple lab personnel during processing if payor requires distinction. |
QX | Service furnished under a qualified non-physician practitioner’s supervision | Use when the service is performed under a qualified NPP’s supervision and payor requires modifier. |
QY | Attending surgeon present and dictating services | Rare; use only when documentation supports attending presence and payor expects modifier. |
TC | Technical component | Use when billing only the technical component (laboratory processing, sequencing, data generation) separate from professional interpretation. |
TG | Point-of-care clinical diagnostic lab test | Use only if test is performed and billed as a point-of-care test per payor rules (unlikely for this PLA). |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207RC0000X | Cardiology | Ordering cardiologists frequently request genetic ion channelopathy testing. |
| 207L00000X | Clinical Genetics | Medical geneticists evaluate inherited arrhythmia syndromes and interpret results. |
| 2080P0207X | Cardiovascular Disease (electrophysiology) | Cardiac electrophysiologists manage arrhythmia diagnosis and downstream care. |
| 208000000X | Internal Medicine | Primary care or hospitalists may order testing as part of evaluation for syncope or family history. |
| 363LF0000X | Molecular Pathology & Cytogenetics | Laboratory specialists performing or overseeing genetic testing services. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
I45.81 | Long QT syndrome | Primary inherited ion channelopathy indication prompting targeted genetic testing. |
I49.01 | Ventricular fibrillation | Occurrence of malignant ventricular arrhythmia may trigger genetic evaluation for channelopathies. |
R55 | Syncope and collapse | Unexplained syncope is a common presenting symptom leading to cardiac genetic testing. |
Z82.49 | Family history of sudden cardiac death | Family history prompts cascade genetic testing for at-risk relatives. |
I46.9 | Cardiac arrest, cause unspecified | Survivors of unexplained cardiac arrest often undergo genetic testing for arrhythmia syndromes. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
81479 | Unlisted molecular pathology procedure | Used when an alternative, non-proprietary molecular test is performed that does not have a specific PLA code; may be used if different panel is ordered. |
81415 | Exome sequencing, interpretation and report (when performed) | Performed in some workflows when broader genomic interrogation is needed beyond the PLA-targeted 10-gene panel; may precede or follow targeted testing. |
88360 | Morphometric analysis (if applicable) | Rarely related; included when tissue morphometry supports clinicopathologic correlation in complex cases. |
99000 | Handling and/or special courier service | Used to report special specimen handling or expedited shipping fees when allowed by payer policy. |
99070 | Supplies and materials billed separately | Used to bill for special supplies related to specimen collection when payor permits. |