Summary & Overview
CPT 85999: Unlisted Hematology and Coagulation Procedure
CPT code 85999 is the unlisted code for hematology and coagulation procedures used when a specific CPT code does not exist for a laboratory or pathology test related to blood disorders or clotting function. Nationally, unlisted procedure codes like 85999 are important for capturing novel, rare, or highly specialized hematology and coagulation services that fall outside established coding descriptors. Payers commonly referenced in policies include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
This publication provides readers with a concise national overview of CPT code 85999, including how it is used in clinical and billing practice, typical sites of service, and the payers covered in the analysis. Readers will find discussion of payer coverage patterns and documentation expectations, an outline of common clinical contexts where 85999 may be reported, and guidance on what benchmarking and policy topics are relevant for unlisted hematology/coagulation procedures. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 85999 is an unlisted hematology and coagulation procedure code used to report laboratory or pathology services in the hematology/coagulation specialty that do not have a specific CPT code. It represents procedures or tests related to blood disorders and clotting function that fall outside established, coded hematology and coagulation services.
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Service type: Hematology and coagulation laboratory or pathology procedures
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Typical site of service: Clinical laboratory, hospital laboratory, pathology department, or outpatient laboratory setting
Clinical & Coding Specifications
Clinical Context
A 62-year-old outpatient with a history of unexplained easy bruising and prolonged bleeding after a dental extraction presents for specialized hematology laboratory testing. The clinician orders an uncommon coagulation panel that includes a specialized platelet function assay and a novel clotting factor activity assay not represented by a specific CPT code. The specimen is collected in the clinic phlebotomy area and sent to a reference laboratory. The laboratory performs the non-routine tests using validated methods and reports quantitative results to the ordering hematologist. Typical workflow: order placement in the electronic medical record, specimen collection and appropriate transport, performance of the specialized hematology/coagulation procedures in the clinical laboratory or reference lab, result verification by a pathologist or clinical laboratorian, and final reporting to the ordering provider. Typical site of service includes hospital outpatient laboratory, independent clinical laboratory, and reference lab. The patient scenario may require coordination of professional and technical components, potential application of modifiers for unusual circumstances, and documentation of medical necessity in the chart.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the laboratory documents unusually high complexity or work required to perform the non-routine hematology/coagulation procedure. |