Summary & Overview
CPT 89240: Unlisted Pathology Procedure
CPT code 89240 identifies unlisted pathology procedures and is used when a pathology service lacks a specific CPT descriptor. This code is important nationally because it enables reporting and billing for atypical or novel pathology tests that cannot be matched to existing codes, ensuring clinical services are documented and can be processed by payers.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how 89240 is used in clinical and billing workflows, typical sites of service where the code is reported, and guidance on what information is commonly needed to support claims for unlisted pathology procedures.
The publication covers benchmarking practices for unlisted pathology reporting, documentation expectations, and common administrative considerations when submitting 89240 claims to major national payers. It also outlines areas where policy updates or payer-specific requirements may affect claim acceptance. Data not available in the input will be noted where applicable.
Billing Code Overview
CPT code 89240 is an unlisted pathology procedure code used to report pathology services that do not have a specific, existing CPT code. It serves as a catch-all for unique or uncommon pathology procedures that fall outside established coding descriptors.
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Service type: Pathology procedure (unlisted)
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Typical site of service: Hospital pathology laboratories, independent pathology labs, and outpatient surgical or procedural settings where specialized or atypical pathology testing is performed.
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Clinical & Coding Specifications
Clinical Context
A 45-year-old outpatient undergoes a non-routine pathology service in the hospital's central laboratory when a laboratory technologist encounters a specimen requiring a test or analytic procedure that does not have a specific CPT code. The specimen may be a rare tissue, a unique cytogenetic preparation, or a specialized staining/analysis requested by the pathologist for diagnostic clarification. The workflow begins with clinician collection and submission of the specimen, accessioning by the pathology laboratory, and consultation by the pathologist to determine that an unlisted pathology procedure is required. The laboratory documents the method, materials, time, and clinical rationale in the pathology report. Billing uses unlisted pathology code 89240 with an itemized report and documentation to support medical necessity; payer-specific requirements (for example, submission of procedure notes or peer-to-peer review) are followed prior to reimbursement adjudication.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased Procedural Services | When the technical complexity or time of the unlisted pathology procedure is substantially greater than typical procedures. |
26 |