Summary & Overview
CPT 88346: Immunofluorescence Single-Antibody Study
CPT code 88346 represents a single-antibody immunofluorescent study used by pathologists and laboratory analysts to detect autoimmune disorders or infectious agents in tissue or cellular specimens. This targeted diagnostic technique informs clinical management for conditions such as certain immune-mediated diseases and infections where antigen localization within tissue is critical. Nationally, accurate coding for immunofluorescence studies affects laboratory workflow, reimbursement, and appropriate use of specialized pathology services.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines payer coverage patterns, common billing considerations, and the clinical contexts in which 88346 is typically applied.
Readers will learn: benchmarks for utilization of single-antibody immunofluorescence relative to other pathology tests; common site-of-service settings and clinical indications for ordering the study; coding and billing considerations that influence laboratory documentation and claims submission; and relevant policy updates and payer practices that affect coverage and payment. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 88346 describes an immunofluorescent study using a single antibody stain performed by a pathology or laboratory analyst to detect autoimmune disease or an infectious organism in a tissue or cellular sample. The procedure involves applying a single fluorescent-labeled antibody to a specimen and interpreting the resulting fluorescence pattern to aid diagnosis.
Service type: Immunofluorescence single-antibody staining and interpretation.
Typical site of service: Hospital or independent clinical laboratory, pathology department, or outpatient surgical pathology lab.
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient presents to dermatology with a progressive, pruritic, scaly rash suspicious for autoimmune blistering disease. The dermatologist performs a skin punch biopsy and submits tissue for immunofluorescence testing. The histology lab receives the fresh frozen specimen; a clinical laboratory scientist or pathology technologist performs an immunofluorescent study using a single antibody stain to detect deposition of immunoglobulin or complement (direct immunofluorescence) to confirm conditions such as bullous pemphigoid or pemphigus vulgaris. Results are reported to the ordering provider and incorporated into the pathology report to guide diagnosis and therapy.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation component if the laboratory separates technical and professional charges. |
TC | Technical component | Use when billing only the technical component (laboratory processing) without professional interpretation. |