Summary & Overview
HCPCS Level II P2029: Congo red blood test
HCPCS Level II code P2029 designates the laboratory procedure “Congo red, blood,” a diagnostic stain used primarily to detect amyloid or related protein deposits in blood specimens. As a specific HCPCS Level II pathology/laboratory code, it matters nationally for coding consistency, claims processing, and coverage decisions involving specialized laboratory testing. Payers rely on accurate HCPCS Level II coding to determine coverage, prior authorization needs, and reimbursement levels for uncommon or specialty assays.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of code usage, payer coverage considerations, and the clinical context in which this test is ordered. The publication outlines typical billing scenarios, common modifiers associated with laboratory services, and where the test is usually performed.
This summary provides clinicians, billing staff, and policy analysts with benchmarks for administrative handling of P2029, notes on clinical indications tied to Congo red staining in hematology, and a reference for expected sites of service. Data not available in the input is explicitly noted elsewhere.
Billing Code Overview
HCPCS Level II code P2029 describes Congo red, blood. This code is used for laboratory testing that applies Congo red staining techniques to a blood specimen, commonly for the identification of amyloid or related protein deposits in hematologic evaluations.
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Service type: Laboratory diagnostic test
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Typical site of service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred from primary care or hematology for evaluation of suspected systemic amyloidosis after presenting with unexplained nephrotic-range proteinuria, restrictive cardiomyopathy, peripheral neuropathy, or abnormal light-chain studies. A phlebotomy appointment is scheduled in an outpatient laboratory or hospital lab. A trained phlebotomist or laboratory technologist collects a blood specimen in the appropriate tube, labels it per facility policy, and sends it to the clinical laboratory. The laboratory performs Congo red staining on a blood-derived specimen (usually to detect circulating amyloid or for research/confirmatory testing) or processes the sample for further confirmatory testing such as immunofixation, serum free light chains, or mass spectrometry. Results are reviewed by the ordering clinician (e.g., hematologist, nephrologist, cardiologist) and integrated with clinical evaluation, tissue biopsy results, and other laboratory studies to guide diagnosis and management.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when only the professional interpretation of the laboratory result is billed separately from the technical component. |
TC | Technical component |