Summary & Overview
CPT 0264U: Praxis Optical Genome Mapping for Chromosomal Structural Variants
CPT code 0264U is a Proprietary Laboratory Analyses (PLA) code that reports Praxis Optical Genome Mapping, an optical genome mapping (OGM) test performed on specimens such as blood to detect chromosomal structural variants for genetic disorder diagnosis. As a PLA code tied to a single manufacturer's assay, 0264U identifies a specific laboratory service rather than a generic methodology and is significant where high-resolution structural variant detection can influence diagnostic pathways and care decisions.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of coverage and reimbursement benchmarks across these major payers, context on clinical utility and appropriate service settings, and notes on billing implications tied to the PLA designation. The publication highlights service-line considerations for laboratories and clinicians referring specimens for OGM and outlines how the proprietary nature of the test affects coding and payer recognition.
The report delivers practical reference material: a payer-focused summary of coverage approaches, typical sites of service and service type description, common billing modifiers and practice-level considerations, and pointers to clinical contexts where OGM may be applied. Data not available in the input is identified explicitly in relevant sections.
Billing Code Overview
CPT code 0264U is a Proprietary Laboratory Analyses (PLA) code reported only for Praxis Optical Genome Mapping from Praxis Genomics LLC. The test uses optical genome mapping (OGM) on a specimen such as blood to identify chromosomal structural variants that can aid in the diagnosis of genetic disorders.
Service Type: Laboratory — Proprietary genomic diagnostic test
Typical Site of Service: Clinical laboratory or reference testing laboratory
Clinical & Coding Specifications
Clinical Context
A patient with suspected or confirmed constitutional or syndromic genetic disease is referred for comprehensive structural genomic analysis after prior chromosomal microarray, karyotype, or targeted testing is non-diagnostic or incomplete. Typical patients include a newborn or child with multiple congenital anomalies, developmental delay, growth abnormalities, or a family with recurrent pregnancy loss, or an adult with unexplained neurodevelopmental disorder or cancer predisposition when structural variants are suspected. The clinical workflow: the ordering clinician (geneticist, maternal-fetal medicine specialist, or pediatrician) collects an approved specimen (commonly peripheral blood or cultured cells) and sends it to Praxis Genomics LLC. The lab performs optical genome mapping (OGM) to detect large structural variants, balanced translocations, insertions, inversions, and complex rearrangements. The laboratory analyzes results, generates a report with variant interpretation and clinical significance, and returns findings to the ordering provider for integration into diagnosis, genetic counseling, and management planning. Insurance prior authorization or laboratory benefit verification is often completed before testing due to proprietary PLA status.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier. | Use when no special circumstances apply. |
22 | Increased procedural services. | Use when documentation supports substantially greater work or laboratory effort beyond usual for the test (rare for PLA tests). |
26 | Professional component. | Use when only the professional component (interpretation) is billed separately from the technical component. |
52 | Reduced services. | Use when testing is partially performed or truncated and full service was not provided. |
53 | Discontinued procedure. | Use when testing was started but discontinued for patient-related or technical reasons. |
54 | Surgical care only. | Rare for this test; use if separate billing for surgical portion of specimen collection applies. |
55 | Postoperative management only. | Rarely applicable; use if only postoperative care is billed separately. |
62 | Two surgeons. | Not typically applicable to the lab test; included if two surgeons were involved in specimen acquisition. |
78 | Unplanned return to OR for related procedure. | Only applicable if a related surgical event required repeat operative intervention for specimen issues. |
80 | Assistant surgeon. | Use if an assistant surgeon is separately billing for specimen collection. |
82 | Assistant surgeon (when qualified resident not available). | Similar to 80 when applicable. |
TC | Technical component. | Use when only the laboratory technical processing and instrumentation are billed. |
QX | Ordering physician certification and modifier for CLIA-waived/complex? | Use when specific contractual or billing arrangements require identifying the performing practitioner (commonly in reference lab scenarios). |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 2080S0002X | Clinical Molecular Genetics Laboratory | Laboratories that perform molecular and genomic testing, including OGM. |
| 2085P0201X | Molecular Genetic Pathology | Pathologists or labs that interpret complex genomic structural variant reports. |
| 2080P0202X | Clinical Cytogenetics Laboratory | Cytogeneticists and labs involved in structural chromosomal analysis and interpretation. |
| 2084N0400X | Medical Genetics & Genomics | Clinical geneticists who order and integrate OGM results into patient care. |
| 207L00000X | Pediatric Medicine | Pediatricians and pediatric subspecialists managing children with congenital anomalies and developmental delay. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
Q90.9 | Chromosomal abnormality, unspecified | Structural chromosomal abnormalities such as deletions, duplications, and translocations detected by OGM may explain clinical features of patients with unspecified chromosomal anomalies. |
Q93.4 | Deletion of part of chromosome 5 (Cri du Chat syndrome) | OGM can delineate the size and breakpoints of deletions like those seen in Cri du Chat to aid diagnosis and counseling. |
Q87.8 | Other specified congenital malformation syndromes affecting multiple systems | Complex structural variants underlying multisystem congenital syndromes are identifiable with OGM. |
R62.0 | Delayed milestone in childhood | Developmental delay may prompt genomic evaluation with OGM when structural variants are suspected. |
O36.5XX0 | Maternal care for (suspected) chromosomal abnormality in fetus, unspecified trimester, no fetal condition noted | Prenatal investigations for fetal structural chromosomal variants can include OGM on appropriate specimens when indicated. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
81479 | Unlisted molecular pathology procedure. | May be used historically or for non-proprietary, non-specific genomic tests when a PLA code is not available; not appropriate when 0264U exists. |
88291 | Chromosome analysis, metaphase; full karyotype, including tissue culture when performed. | Often performed before or alongside OGM for detection of large chromosomal abnormalities; OGM may detect events missed by karyotype and is used when higher resolution for structural variants is needed. |
87620 | Infectious agent detection by nucleic acid (for reference only). | Not directly related to OGM but represents molecular testing workflow codes; included here as an example of laboratory molecular testing processes. |
81206 | Fragile X testing; Southern blot analysis for FMR1 (example of targeted genetic testing). | Targeted tests like 81206 are alternatives for specific indications; OGM is complementary when structural rearrangements beyond single-gene tests are suspected. |
81445 | Exome sequencing (when billed for diagnostic sequencing). | Diagnostic genomic sequencing may be ordered before or after OGM; exome sequencing detects sequence-level variants while OGM targets structural variants, so both can be complementary in complex cases. |