Summary & Overview
CPT 88319: Special Stain for Enzyme Constituents with Interpretation
CPT code 88319 represents a pathology service for performing a special stain that identifies enzyme constituents in patient specimens (for example, biopsy, blood, or bone marrow), including interpretation and a formal report. Nationally, this code is important for accurate diagnosis of metabolic, hematologic, and neoplastic conditions where enzyme histochemistry informs clinical decision-making and subsequent care.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical role of the service, payer coverage scope, common billing modifiers, and how 88319 is used alongside other pathology services. The publication summarizes typical sites of service and service line context relevant to laboratory and pathology departments.
The article outlines benchmarks and reimbursement context where available, highlights clinical scenarios that commonly require enzyme special stains, and summarizes documentation and reporting expectations tied to professional interpretation. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 88319 describes a special stain for enzyme constituents performed on a patient specimen, such as a biopsy, blood, or bone marrow. A qualified provider, typically a pathologist, performs the staining procedure, interprets the result, and issues a report documenting findings.
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Service type: Pathology laboratory special staining and interpretation
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Typical site of service: Hospital or independent pathology laboratory; specimens originate from outpatient clinics, inpatient wards, or ambulatory surgical sites
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Clinical & Coding Specifications
Clinical Context
A 56-year-old patient presents with persistent fatigue and unexplained anemia. The clinician performs a bone marrow aspiration and biopsy to evaluate for hematologic disorders. The specimen is submitted to pathology for enzymatic histochemistry (special stains) to assess enzyme constituents such as myeloperoxidase, nonspecific esterase, or alkaline phosphatase. A board-certified pathologist performs the special stain, interprets staining patterns, documents findings in a pathology report, and issues a diagnostic interpretation used by the treating hematologist-oncologist to guide diagnosis and therapy.
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Service Type: Diagnostic pathology special stain with interpretation
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Typical Site of Service: Hospital laboratory, independent pathology laboratory, or hospital outpatient pathology service
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Typical Patient Scenario: Adult with bone marrow biopsy for evaluation of suspected myeloid neoplasm, infectious disease evaluation, or metabolic enzyme deficiency where enzyme histochemistry assists in cell lineage determination and diagnosis.
Coding Specifications
| Modifier | Description | When to Use |
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