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CPT 88108: Cytopathology Fluid Smear with Concentration Technique
CPT code 88108 covers the preparation and microscopic interpretation of smears from cytopathology fluids, washings, or brushings (excluding cervical or vaginal specimens) using a concentration technique. This code captures a commonly performed laboratory service that informs diagnosis of cancer, infection, and inflammatory conditions, and supports clinical decision-making across inpatient and outpatient settings nationally. Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context and service setting for CPT code 88108, an overview of payer coverage considerations, typical sites of service, and the common billing modifiers associated with laboratory and professional components. The publication also summarizes benchmarks and policy-relevant topics affecting cytopathology billing, including coding boundaries, documentation expectations, and areas where payer policy variation commonly occurs. Data not available in the input is noted where applicable.
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Billing Code Overview
CPT code 88108 describes the preparation and interpretation of smears from cytopathology fluids, washings, or brushings (excluding cervical or vaginal specimens) using a concentration technique. The service includes both the technologist/analyst preparation of slides and the professional interpretation of cellular morphology to assess disease processes such as malignancy, infection, or inflammation.
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Service type: Cytopathology laboratory procedure involving specimen concentration, smear preparation, and microscopic interpretation.
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Typical site of service: Hospital outpatient laboratory, independent reference laboratory, pathology laboratory, or outpatient clinic laboratory where cytologic specimens from body fluids or washings are processed and examined.