Summary & Overview
CPT 88280: Additional Karyotype Analysis After Initial Chromosome Study
CPT code 88280 covers additional karyotype analyses performed after an initial chromosome analysis with karyotype. This cytogenetic laboratory code matters nationally because karyotyping is a key diagnostic tool for detecting chromosomal abnormalities in prenatal, pediatric, oncologic and reproductive contexts; accurate coding affects clinical documentation, claims adjudication, and consistent national reporting. Primary payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will find a concise overview of what 88280 represents, common clinical and laboratory settings where the service is delivered, and the policy and billing considerations that influence reimbursement and utilization. The publication provides benchmarks where available, summarizes relevant payer coverage trends and documentation expectations, and situates 88280 within related cytogenetic services to clarify clinical intent and billing pathways. Data not available in the input are noted as such in relevant sections. The goal is to equip laboratory managers, billing professionals, and policy analysts with a clear, national-level reference on CPT code 88280 and where it fits in cytogenetic testing workflows.
Billing Code Overview
CPT code 88280 describes additional karyotype analyses performed after an initial chromosome analysis with karyotype. The service involves preparing and interpreting subsequent karyotype studies to evaluate chromosomal abnormalities when further analysis beyond the initial karyotype is required.
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Service type: Cytogenetic laboratory service (additional karyotype analysis)
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Typical site of service: Clinical laboratory or hospital laboratory setting where cytogenetic testing is performed
Clinical & Coding Specifications
Clinical Context
A patient—often a neonate with dysmorphic features, an adult with unexplained infertility or recurrent pregnancy loss, or a cancer patient undergoing cytogenetic evaluation—has a chromosomal analysis ordered. A laboratory cytogenetic analyst performs an initial karyotype to evaluate chromosome number and large structural abnormalities. When additional metaphase spreads or separate karyotype preparations are required (for example to confirm mosaicism, analyze multiple tissues, or provide replicate studies for quality assurance), the analyst performs one or more additional karyotypes under the same testing episode. The workflow: sample receipt and accessioning, cell culture or direct preparation, slide preparation and banding, initial karyotype analysis, decision to run additional karyotypes (documented in the lab report), additional karyotype preparation(s), final interpretation, and report delivery to the ordering clinician. Typical sites of service are hospital laboratories, independent clinical cytogenetics laboratories, and university medical center labs. Common clinical indications include congenital anomalies, developmental delay, pregnancy loss evaluation, infertility, and hematologic malignancy follow-up where additional karyotypes improve diagnostic certainty or detect low‑level mosaicism.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
59 | Distinct procedural service | Use when another distinct procedure is performed on the same day requiring separate reporting unrelated to the additional karyotypes. |