Summary & Overview
CPT 84081: Phosphatidylglycerol Assay of Amniotic Fluid
CPT code 84081 represents a laboratory assay to quantify phosphatidylglycerol, often performed on amniotic fluid to inform assessments of fetal lung maturity. The test has clinical relevance in perinatal care when clinicians evaluate the risk of neonatal respiratory distress and make timing or management decisions related to delivery. Nationally, this code is used across hospital laboratories and specialty reference labs providing perinatal diagnostic services.
Key payers in the national analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication summarizes coverage considerations and utilization context for these major payers and highlights where national policy or clinical guidance may influence test use.
Readers will find a concise overview of clinical indications and typical service settings, a summary of payer coverage scope, and context for how the code is used in perinatal diagnostic workflows. The report also outlines available benchmarks and policy-relevant updates when present. Data not available in the input will be clearly labeled as such in relevant sections.
Billing Code Overview
CPT code 84081 describes a laboratory test that measures phosphatidylglycerol levels in a patient specimen, commonly amniotic fluid. This assay is used to evaluate fetal lung maturity and related clinical questions when assessing risk for neonatal respiratory distress.
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Service type: Clinical laboratory biochemical analysis
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Typical site of service: Hospital or outpatient clinical laboratory, including specialty reference laboratories
Clinical & Coding Specifications
Clinical Context
A pregnant patient at 32–38 weeks' gestation presents with signs of possible fetal lung immaturity or preterm labor. The obstetric clinician orders a laboratory assessment of fetal lung maturity using a phosphatidylglycerol (PG) test on amniotic fluid obtained via amniocentesis. The clinical workflow: the obstetric team performs amniocentesis under ultrasound guidance in an ambulatory procedure room or labor and delivery unit; the collected amniotic fluid specimen is sent to the clinical laboratory with appropriate specimen labeling and requisition. A medical laboratory scientist or lab analyst performs 84081 testing to detect and quantify phosphatidylglycerol, which informs neonatal respiratory distress risk and guides timing of delivery or need for corticosteroids and neonatal respiratory support. Results are reported in the electronic medical record and communicated to the obstetric and neonatal teams for clinical decision-making. Typical site of service: hospital-based laboratory, hospital outpatient department, or specialized clinical reference laboratory. Typical patient scenario: singleton pregnancy with threatened preterm delivery, prior preterm birth, or suspected maternal conditions (e.g., preeclampsia, premature rupture of membranes) where assessment of fetal pulmonary maturity is indicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional (interpretive) component if separated from the technical component |