Summary & Overview
CPT 81428: Cytogenomic Microarray Analysis for Copy Number Variants
CPT code 81428 represents cytogenomic constitutional (genome-wide) microarray analysis, a critical genetic testing procedure used to detect copy number variants across the genome. This advanced laboratory test is instrumental in diagnosing chromosomal abnormalities, including conditions such as Down syndrome, Edwards syndrome, and other unspecified chromosomal deletions and trisomies. The procedure is performed in specialized laboratory settings and is relevant across multiple clinical disciplines, including clinical genetics, pathology, family medicine, internal medicine, and obstetrics & gynecology.
Blue Cross Blue Shield is a key payer covered in this analysis, reflecting the importance of understanding payer policies and coverage for genetic testing services. Readers will gain insights into the clinical context of 81428, including its role in patient care, associated diagnoses, and related CPT codes. The publication also addresses common billing modifiers and taxonomies, providing a comprehensive overview for stakeholders interested in medical billing, coding, and policy updates. Benchmarks and policy developments related to genetic testing are highlighted, offering valuable information for healthcare professionals, administrators, and policy analysts.
This summary provides a national perspective on the utilization and coverage of 81428, equipping readers with essential knowledge for navigating the evolving landscape of genetic testing and medical billing.
CPT Code Overview
CPT code 81428 is used for cytogenomic constitutional (genome-wide) microarray analysis, specifically for the interrogation of genomic regions to identify copy number variants. This procedure utilizes technologies such as bacterial artificial chromosome (BAC) or oligonucleotide-based comparative genomic hybridization (CGH) microarray analysis. The service type is genetic testing, and it is typically performed in a laboratory setting, designated as Place of Service (POS) 81. This code is essential for comprehensive genetic evaluation, aiding in the detection of chromosomal abnormalities and contributing to clinical decision-making in various medical specialties.
Clinical & Coding Specifications
Clinical Context
A newborn presents with multiple congenital anomalies, including developmental delay and dysmorphic features. The pediatrician suspects a chromosomal abnormality and orders cytogenomic constitutional (genome-wide) microarray analysis (CPT 81428) to detect copy number variants that may explain the clinical presentation. The specimen is sent to a laboratory (Place of Service 81), where a clinical geneticist or pathologist interprets the results. The workflow involves specimen collection, laboratory processing, and professional interpretation, often involving collaboration between genetics, pathology, and primary care specialties.
Coding Specifications
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Modifiers:
- Modifier
26: Used when billing for the professional component (interpretation and report) of the procedure. - Modifier
TC: Used when billing for the technical component (laboratory processing and analysis) of the procedure.
- Modifier
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Provider Taxonomies:
| Taxonomy Code | Specialty Name |
|---|---|
207SG0201X | Clinical Genetics (M.D.) |
207ZP0007X | Pathology |
207Q00000X | Family Medicine |
207R00000X | Internal Medicine |
207V00000X | Obstetrics & Gynecology |
These specialties may be involved in ordering, interpreting, or consulting on the results of cytogenomic microarray analysis.
Related Diagnoses
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Q99.9: Chromosomal abnormality, unspecified- Used when a chromosomal abnormality is suspected but not yet defined; relevant for genome-wide microarray analysis to identify unknown variants.
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Q90.9: Down syndrome, unspecified- Applied when Down syndrome is suspected or confirmed; microarray analysis can help characterize chromosomal changes.
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Q93.9: Chromosomal deletion, unspecified- Used for cases where a chromosomal deletion is suspected; microarray analysis is a primary tool for detection.
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Q91.7: Edwards syndrome, unspecified- Relevant for suspected or confirmed Edwards syndrome (trisomy 18); microarray analysis can provide diagnostic confirmation.
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Q92.9: Other specified trisomies and partial trisomies of autosomes, unspecified- Used for other trisomies or partial trisomies; microarray analysis assists in identifying these chromosomal abnormalities.
Related CPT Codes
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81228: Cytogenomic constitutional (genome-wide) microarray analysis; interrogation of genomic regions for copy number variants, each additional microarray.- Used when additional microarray analyses are performed beyond the primary procedure (
81428).
- Used when additional microarray analyses are performed beyond the primary procedure (
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81229: Cytogenomic constitutional (genome-wide) microarray analysis; interrogation of genomic regions for copy number variants, each additional microarray.- Also used for additional microarray analyses, similar to
81228.
- Also used for additional microarray analyses, similar to
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81479: Unlisted molecular pathology procedure.- Used when a molecular pathology procedure does not have a specific CPT code, sometimes as an alternative to
81428for unique or uncommon tests.
- Used when a molecular pathology procedure does not have a specific CPT code, sometimes as an alternative to
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81243: FMR1 (Fragile X mental retardation 1) gene analysis.- Related as a genetic test for Fragile X syndrome, which may be considered in cases of developmental delay or intellectual disability.
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81244: FMR1 (Fragile X mental retardation 1) gene analysis; characterization of alleles.- Used for further characterization of FMR1 alleles, often in conjunction with
81243.
- Used for further characterization of FMR1 alleles, often in conjunction with
Codes 81228 and 81229 are commonly used together with 81428 when multiple microarray analyses are required. Codes 81243 and 81244 may be ordered as alternatives or adjuncts in the genetic evaluation workflow.
National Reimbursement Benchmarks
Nationally, Blue Cross Blue Shield and BUCA (average commercial) both reimburse CPT code 81428 at a mean rate of $80.02. No Medicare benchmark rates are available for this code in the provided data, so a comparison between commercial and Medicare rates cannot be made.
Rate dispersion for both Blue Cross Blue Shield and BUCA is extremely tight, with the 25th, 50th, and 75th percentiles all at $80.00. This indicates no meaningful variation in rates across these commercial payers. The table and chart below present the full breakdown of national benchmarks for CPT code 81428.
Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.