Summary & Overview
CPT 85421: Fibrinolytic Plasminogen Immunoassay
CPT code 85421 denotes an immunoassay performed to measure fibrinolytic plasminogen levels, a laboratory test with clinical importance for evaluating disorders of fibrinolysis and bleeding or thrombotic risk. Nationally, standardized coding for specialized hemostasis assays supports consistent reporting, clinical decision-making, and claims processing across hospital and independent clinical laboratories.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Coverage and payment policies for specialized immunoassays can vary by payer and by clinical indication, affecting access and billing practices for clinicians and laboratory providers.
Readers will find a concise overview of the clinical context for the assay, typical sites of service, and the role of CPT code 85421 in claims submission. The publication also summarizes payer coverage scope, common billing considerations, and where to look for policy updates and reimbursement guidance. Data on specific payer rates, modifier use, and associated ICD-10 diagnoses are not provided in the input and are identified as unavailable where applicable.
Billing Code Overview
CPT code 85421 describes an immunoassay performed by a laboratory analyst to measure fibrinolytic plasminogen levels. The test quantifies plasminogen concentration, a key component of the fibrinolytic system involved in clot breakdown and hemostasis.
Service Type: Laboratory / Clinical Pathology Test
Typical Site of Service: Clinical laboratory or hospital laboratory performing immunoassay testing.
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred by a hematologist or primary care provider to a clinical laboratory for quantitative assessment of plasminogen or plasminogen-related fibrinolytic proteins using an immunoassay. Common scenarios include evaluation of unexplained bleeding or thrombosis, investigation of suspected congenital or acquired plasminogen deficiency, monitoring of patients on anticoagulant or thrombolytic therapy, or part of a hyperfibrinolysis workup in liver disease, sepsis, or trauma. The workflow begins with a clinician order, phlebotomy for a plasma specimen collected in sodium citrate, specimen transport to the laboratory, accessioning, performance of the immunoassay by a trained laboratory scientist or technologist, result verification by a laboratory director or supervising pathologist if required, and final reporting into the electronic medical record. Turnaround time is typically hours to one day depending on laboratory capabilities; reflex testing or confirmatory assays may be ordered based on abnormal results.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing for the physician/pathologist interpretation or professional portion separate from the laboratory technical component |
TC |