Summary & Overview
CPT 88321: Pathology Consultation - Slide Review
CPT code 88321 denotes a pathology consultative service in which a qualified pathologist reviews histology slides prepared at another facility and issues a formal report. This code captures a single surgical case as the unit of service regardless of slide count, and it is widely used across hospital pathology departments and independent laboratories. The code matters nationally because inter-laboratory slide review supports diagnostic accuracy, peer consultation, and continuity of care for surgical pathology cases.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service settings, benchmark considerations for utilization and billing practice, common modifiers and coding considerations, and implications for claims processing and payer interactions. The analysis addresses how the code is applied to surgical case reviews, typical sites of service, and operational notes relevant to billing teams and coding staff. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 88321 describes a pathology consultative service in which a qualified provider, typically a pathologist, reviews slides prepared by another laboratory or facility and issues a formal consultation report. The service is reported as one unit per surgical case regardless of the number of slides received.
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Service type: Pathology consultation / slide review
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Typical site of service: Hospital pathology department, independent pathology laboratory, or other facility where surgical specimens are analyzed and slides are prepared elsewhere
Clinical & Coding Specifications
Clinical Context
A surgical pathology consultation occurs when a pathologist reviews glass slides or digital images prepared by another laboratory or institution and issues a formal consultative report for a single surgical case. A typical patient scenario: a 62-year-old female underwent an excisional breast biopsy at a community hospital. The local lab prepares hematoxylin and eosin slides and performs routine stains, then requests an external academic pathology consult for diagnostic confirmation and treatment guidance. The consultation file includes the specimen accession, clinical history (palpable mass, prior imaging), and several slides. The consulting pathologist reviews morphology, may request additional immunohistochemical stains (if authorized by the sending lab or as part of a separate billing arrangement), and issues a signed consultative report describing diagnosis, margin status if applicable, and recommendations. The consulting report is transmitted to the sending clinician and becomes part of the patient record for surgical planning and oncology care.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the professional consultative interpretation separate from technical slide preparation |
59 |