Summary & Overview
CPT 0266U: Praxis Transcriptome NGS Transcriptome Analysis
CPT code 0266U identifies a proprietary NGS-based transcriptome assay, Praxis Transcriptome from Praxis Genomics LLC, designed to detect gene expression changes linked to constitutional and other heritable disorders. As a PLA code, 0266U applies exclusively to this single manufacturer’s test, which is performed on blood, frozen tissue, or FFPE specimens. Its specificity matters nationally because PLA codes standardize reporting for unique commercial tests and inform coverage and billing practices across payers.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, the test’s role in hereditary disorder evaluation, and typical sites of service. The publication provides benchmarks and payer coverage notes where available, highlights policy considerations relevant to proprietary laboratory tests, and summarizes coding and billing implications tied to PLA designation.
The report is intended for billing professionals, laboratory directors, and policy analysts seeking clear guidance on the clinical description, coding specificity, and operational settings for 0266U. Data not available in the input is noted where applicable, and the focus remains on national-level interpretation rather than state-specific guidance.
Billing Code Overview
CPT code 0266U is a Proprietary Laboratory Analyses (PLA) code for the Praxis Transcriptome test from Praxis Genomics LLC. The assay uses transcriptome analysis and next-generation sequencing (NGS) to detect gene expression changes associated with constitutional or other heritable disorders. Report 0266U only for this specific manufacturer’s test performed on specimens such as blood, frozen tissue, or formalin–fixed paraffin–embedded (FFPE) tissue.
Service type: Laboratory molecular diagnostic testing using NGS-based transcriptome analysis
Typical site of service: Clinical laboratory or reference pathology laboratory; specimens collected in outpatient clinics, hospitals, or specialized collection centers
Clinical & Coding Specifications
Clinical Context
A pediatric or adult patient with a suspected constitutional or heritable genetic disorder is referred for transcriptome testing after initial genetic evaluation. The patient presents with unexplained developmental delay, multiple congenital anomalies, neuromuscular signs, or a family history suggesting a hereditary syndrome. A geneticist, neurologist, or clinical molecular pathologist orders the 0266U Praxis Transcriptome test to evaluate gene expression signatures from a submitted specimen (peripheral blood, frozen tissue, or formalin–fixed paraffin–embedded tissue).
Specimen collection occurs in an outpatient clinic, hospital inpatient unit, or surgical pathology suite depending on the tissue source. For blood, a phlebotomist draws EDTA tube(s) and ships per laboratory instructions. For FFPE or frozen tissue, the surgical team or pathology department prepares and sends the block or fresh/frozen samples with appropriate chain-of-custody and requisition. The laboratory performs RNA extraction, next-generation sequencing (NGS) transcriptome analysis, bioinformatic processing, and clinical interpretation to determine presence or absence of gene expression changes associated with constitutional or heritable disorders. Results report is routed to the ordering clinician for correlation with clinical findings and family counseling. Billing for the proprietary laboratory analysis is reported using 0266U with applicable modifiers to indicate professional/technical components, bilateral procedures, unusual circumstances, or payer-specific reporting requirements.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When only the professional interpretation component is billed separately from the laboratory technical processing. |
TC | Technical component | When only the laboratory technical component (analytic processing) is billed. |
QK | CLIA waived test - waived under manufacturer instructions (PLA-specific) | When reporting PLA tests that carry specific CLIA or laboratory billing indicator requirements per payer guidance. |
QX | Modifier for certified lab personnel performing the test (CLIA personnel) | When a non-physician practitioner performs the service under CLIA personnel rules and payers require this modifier. |
QY | Laboratory performing testing is the billing laboratory | When the performing laboratory bills the test directly rather than a referring lab. |
52 | Reduced services | When specimen quality or quantity limits testing scope and a reduced service is performed. |
53 | Discontinued procedure | When testing cannot be completed due to preanalytic or analytic failure and the service is discontinued. |
59* | Distinct procedural service (note: not in provided list) | Data not available in the input. |
22 | Increased procedural services | When atypical complexity in interpretation or reporting justifies increased payment per payer policy. |
80 | Surgeon performed temporary assistant (not typical for lab) | Rarely used; include only if a surgical assistant is separately billing for tissue procurement. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
2080P0206X | Clinical Molecular Geneticist | Specialists who order and interpret hereditary transcriptome testing. |
207RH0000X | Clinical Laboratory Geneticist | Laboratory directors responsible for test validation and reporting. |
207L00000X | Pathology | Surgical pathologists handling FFPE/frozen tissue procurement and submission. |
2084P0800X | Neurology | Neurologists ordering testing for neuromuscular or neurodevelopmental presentations. |
208000000X | Pediatrics | Pediatricians and pediatric subspecialists ordering testing for developmental disorders. |
*Note: 59 was not among the provided modifiers; only modifiers from the input list were selected and explained. If local payer rules require additional modifiers, follow payer policy.
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
Q87.8 | Other congenital malformation syndromes predominantly affecting limbs | Phenotypic congenital anomalies prompting transcriptome testing for underlying genetic causes. |
R62.0 | Delayed milestone in childhood | Neurodevelopmental delay often leads to genetic evaluation including transcriptome assays. |
G71.3 | Mitochondrial myopathy, not elsewhere classified | Suspected mitochondrial or metabolic disorders may be investigated with transcriptome profiling. |
F84.0 | Autism spectrum disorder | Some cases of autism spectrum disorder with syndromic features undergo broader genomic and transcriptome testing. |
Z15.0 | Genetic susceptibility to disease | Family history or predisposition evaluations that prompt molecular transcriptome analysis. |
Note: These ICD-10 codes are commonly associated with evaluations that may incorporate transcriptome NGS testing for constitutional or heritable disorders.
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
83020 | Hemoglobin electrophoresis or related hematologic laboratory test | Preanalytic hematology tests may be performed on blood specimens prior to RNA extraction in complex cases. |
88342 | Immunohistochemistry, per single antigen-antibody stain | Ancillary pathology stains on FFPE tissue that may be performed alongside to phenotype tissue before molecular testing. |
81479 | Unlisted molecular pathology procedure | Used when a specific molecular or genomic test is not represented by a PLA or existing CPT; sometimes used for related custom assays when applicable. |
96372 | Therapeutic, prophylactic, or diagnostic injection | Procedural codes for administration of agents are unrelated but may appear on the same claim for clinic visits where blood is drawn. |
99000 | Handling and/or conveyance of specimen to off-site lab | Applicable when an institution bills separately for specimen transport or special handling associated with sending samples to Praxis Genomics. |
Note: The proprietary laboratory analysis described by 0266U is billed specifically for the Praxis Transcriptome test; the codes above represent common ancillary or sequential services in the clinical workflow.