Pathology CPT Codes: Understanding Billing and Laboratory Procedures

Pathology is a critical branch of medicine that diagnoses diseases by examining tissues, blood, and bodily fluids. Accurate billing and coding in pathology ensure proper reimbursement and compliance with healthcare regulations. Current Procedural Terminology (CPT) codes are essential for documenting pathology services, from lab tests to surgical pathology examinations.

This guide provides an in-depth look at pathology CPT codes, including their applications, billing nuances, and updates. Whether you’re a pathologist, medical coder, or healthcare administrator, understanding these codes is crucial for efficient practice management.

Pathology CPT Codes

Table of Contents

CPT Codes for Pathology Tests

Pathology tests range from routine blood work to complex molecular diagnostics. Below are key CPT codes used in pathology testing:

Common Pathology Test CPT Codes

CPT Code	Description	Typical Use Case
80048	Basic metabolic panel (BMP)	Measures glucose, electrolytes, kidney function
85025	Complete blood count (CBC)	Evaluates overall health and detects disorders
88112	Cytopathology, cervical smear	Pap smear screening
88305	Tissue examination, biopsy	Surgical pathology, tumor diagnosis
88342	Immunohistochemistry (IHC)	Cancer marker identification

Key Considerations:

Molecular pathology codes (81162-81479) are used for genetic testing.
Drug testing (80305-80377) has specific codes based on methodology.
Modifiers (e.g., -26 for professional component) may apply.

Pathology Review CPT Codes

Pathologists often review slides or consult on cases, requiring specific CPT codes:

CPT Code	Description	Usage
88321	Consultation on referred slides	Second opinion on outside pathology
88325	Additional tissue block review	Further examination of stored samples
88329	Special stains interpretation	Identifying microorganisms or abnormal cells

Billing Tips:

Document medical necessity for reviews.
Use modifier -26 if only the professional component is billed.

Pathology Report CPT Codes

Pathology reports summarize diagnostic findings. Common CPT codes include:

88300 – Gross examination only (no microscopy)
88302-88309 – Surgical pathology, varying complexity
88319 – Frozen section diagnosis (intraoperative)

Example: A breast biopsy (CPT 88305) may include a gross and microscopic exam, while a complex cancer case may require additional stains (88342).

CPT Codes for Pathology and Laboratory Services

Laboratory pathology involves chemistry, hematology, microbiology, and genetics. Key codes:

Category	CPT Range	Examples
Chemistry	82000-84999	82565 (Creatinine)
Hematology	85002-85999	85027 (CBC with differential)
Microbiology	87001-87999	87186 (Culture, bacteria)
Molecular	81162-81479	81270 (BRCA gene analysis)

Compliance Note:

CLIA-waived tests have different billing rules.
Medicare Local Coverage Determinations (LCDs) may affect reimbursement.

Common Pathology and Lab CPT Codes

Here’s a quick-reference table for frequently used codes:

Test Type	CPT Code	Description
Lipid Panel	80061	Cholesterol, triglycerides
Liver Function	80076	AST, ALT, bilirubin
Thyroid Test	84443	TSH (Thyroid-stimulating hormone)
HIV Viral Load	87536	Quantitative HIV RNA

Conclusion

Understanding pathology CPT codes ensures accurate billing, compliance, and optimal reimbursement. From basic lab tests (80048) to complex molecular diagnostics (81479), each code has specific applications. Proper documentation and adherence to CMS and AMA guidelines are essential for pathology practices.