Summary & Overview
CPT 85730: Partial Thromboplastin Time (PTT/APTT) Assay
CPT code 85730 denotes the partial thromboplastin time (PTT/APTT) laboratory assay, a widely used coagulation test for diagnosing bleeding disorders and for monitoring anticoagulant therapy. Nationally, this code underpins routine and urgent coagulation testing across hospital and outpatient laboratories, influencing clinical decision-making for patients on heparin and other anticoagulants. It also factors into laboratory service utilization, revenue cycle workflows, and quality measurement for anticoagulation management.
Key payers discussed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and common sites of service, plus analysis of coverage and billing considerations relevant to laboratory, hospital, and outpatient providers where available. The publication covers benchmarks and payer practices where documented, common modifier patterns provided by payers, and implications for claims submission and audit readiness.
This summary provides clinicians, laboratory managers, and billing professionals with a clear reference for the clinical purpose of CPT code 85730, the settings in which the test is typically performed, and the payer landscape that impacts reimbursement and administrative handling. Data not available in the input for payer-specific rates, associated taxonomies, and ICD-10 mappings is noted where applicable.
Billing Code Overview
CPT code 85730 describes a laboratory assay that measures partial thromboplastin time (PTT), also known as activated partial thromboplastin time (APTT), using plasma or whole blood. The test evaluates the intrinsic and common coagulation pathways and is used to diagnose bleeding disorders and monitor anticoagulant therapy.
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Service type: Clinical laboratory diagnostic test (coagulation assay)
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Typical site of service: Clinical laboratory, hospital laboratory, outpatient laboratory, or other settings where blood specimens are collected and processed
Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 62-year-old male receiving unfractionated heparin for treatment of a proximal deep vein thrombosis presents for routine laboratory monitoring. The clinician orders an activated partial thromboplastin time to assess anticoagulant effect and adjust the heparin infusion. A phlebotomy technician collects a citrated plasma sample in the hospital laboratory. The clinical laboratory analyst performs the 85730 PTT/APTT assay using plasma or whole blood on an automated coagulation instrument. The result is reported to the treating provider, documented in the electronic medical record, and used to guide heparin dosing or to evaluate a suspected bleeding diathesis. Typical workflow steps include order entry by the provider, specimen collection and transport to the lab, specimen accessioning, performance of the 85730 assay by the laboratory technologist, verification by a licensed medical technologist or pathologist, result reporting, and clinician interpretation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation/oversight portion if separated from the technical lab work. |