Pathology and Laboratory CPT Codes List (0001U to 89398)

touseef
July 20, 2026

Written by Touseef Riaz Founder, UControl Billing

July 20, 2026

Laboratory testing plays a vital role in modern healthcare. Physicians depend on accurate laboratory results to diagnose diseases, monitor treatment, detect infections, assess organ function, and guide patient care. Behind every laboratory test is a CPT code that supports documentation, insurance claims, and reimbursement.

Whether you operate an independent laboratory, manage a physician practice, work as a medical coder, or oversee revenue cycle management, understanding the Pathology and Laboratory CPT code section helps improve coding accuracy and reduce billing errors.

This guide explains how the Pathology and Laboratory CPT section is organized, what each code range covers, documentation requirements, billing considerations, and common coding challenges.

What Are Pathology and Laboratory CPT Codes?

Pathology and Laboratory CPT codes describe diagnostic laboratory services performed to identify diseases, evaluate body functions, detect infections, monitor medications, and support treatment decisions.

Healthcare organizations use these codes to:

Submit laboratory claims
Document diagnostic testing
Support medical necessity
Receive reimbursement
Track patient outcomes
Meet payer and regulatory requirements

Unlike diagnosis codes, which explain the patient’s condition, CPT codes identify the laboratory test or pathology service that healthcare professionals performed.

For example:

An ICD 10 CM code may identify diabetes mellitus.
A laboratory CPT code reports the blood test ordered to evaluate glucose control.

Together, diagnosis and procedure codes support accurate claims processing.

Why Accurate Laboratory Coding Matters

Every day, laboratories process thousands of specimens.

Accurate coding helps healthcare organizations:

Reduce claim denials
Improve reimbursement accuracy
Support regulatory compliance
Maintain complete patient records
Improve revenue cycle performance
Reduce unnecessary claim corrections

Incorrect coding may delay payment, trigger payer audits, or require claim resubmission.

Proper documentation and careful code selection help prevent these issues.

Pathology and Laboratory CPT Code Categories (0001U to 89398)

CPT Code Range	Laboratory Category	Common Services
0001U to 0241U	Proprietary Laboratory Analyses	Proprietary molecular and genomic laboratory tests
80047 to 80081	Organ or Disease Oriented Panels	Metabolic, hepatic, renal, lipid, electrolyte panels
80143 to 80377	Therapeutic Drug Assays	Medication level monitoring
80305 to 83992	Drug Assay Procedures	Drug screening and toxicology testing
80400 to 80439	Evocative and Suppression Testing	Endocrine stimulation and suppression studies
80500 to 80502	Clinical Pathology Consultations	Pathologist interpretation and consultation
81000 to 81099	Urinalysis	Routine and specialized urine testing
81105 to 81479	Molecular Pathology	Genetic mutation and molecular testing
81410 to 81471	Genomic Sequencing	Advanced genomic analysis
81490 to 81599	Multianalyte Assays	Algorithm based laboratory testing
82009 to 84999	Chemistry	Blood chemistry and organ function testing
85002 to 85999	Hematology and Coagulation	Blood counts and clotting studies
86000 to 86849	Immunology	Immune system testing
86850 to 86999	Transfusion Medicine	Blood typing and compatibility testing
87003 to 87999	Microbiology	Bacterial, viral, fungal, and parasitic testing
88000 to 88099	Anatomic Pathology	Tissue examination
88104 to 88199	Cytopathology	Cell examination
88230 to 88299	Cytogenetic Studies	Chromosome analysis
88300 to 88399	Surgical Pathology	Surgical specimen examination
88720 to 88749	In Vivo Laboratory Services	Noninvasive laboratory measurements
89049 to 89240	Other Laboratory Services	Miscellaneous pathology procedures
89250 to 89398	Reproductive Medicine	Fertility laboratory services

Proprietary Laboratory Analyses (0001U to 0241U)

Proprietary Laboratory Analyses, often called PLA codes, identify laboratory tests developed by individual laboratories or manufacturers. These tests typically use proprietary methodologies, specialized biomarkers, or advanced molecular technologies that do not fit within standard CPT categories.

Many precision medicine, oncology, and genetic testing laboratories report services from this category.

Common Applications

Examples include:

Precision oncology testing
Hereditary cancer screening
Cardiovascular risk analysis
Infectious disease molecular testing
Pharmacogenomic testing
Personalized medicine assays

Documentation Requirements

Laboratory documentation should clearly include:

Test ordered
Clinical indication
Ordering provider
Specimen type
Laboratory performing the analysis
Test methodology when applicable
Final laboratory interpretation

Because many PLA tests are highly specialized, coders should confirm payer coverage and medical necessity before claim submission.

Organ or Disease Oriented Panels (80047 to 80081)

Panel testing combines several related laboratory tests into one report to evaluate organ systems or specific diseases.

Ordering a panel often improves efficiency and provides physicians with a broader clinical picture than ordering each laboratory test separately.

Common Laboratory Panels

Examples include:

Basic Metabolic Panel
Comprehensive Metabolic Panel
Hepatic Function Panel
Lipid Panel
Renal Function Panel
Electrolyte Panel
Obstetric Laboratory Panels

Documentation Requirements

Providers should document:

Medical necessity
Panel ordered
Diagnosis supporting the panel
Laboratory findings
Physician interpretation when applicable

Payers generally reimburse panel testing according to established CPT coding rules rather than billing every individual component separately.

Therapeutic Drug Assays (80143 to 80377)

Therapeutic drug assays measure medication levels in a patient’s blood or other body fluids. Physicians use these tests to determine whether a medication remains within the therapeutic range and to reduce the risk of toxicity or treatment failure.

These assays are common in specialties such as neurology, cardiology, infectious disease, psychiatry, and transplant medicine.

Common Uses

Therapeutic drug monitoring helps manage medications such as:

Anticonvulsants
Cardiac medications
Antibiotics
Immunosuppressants
Mood stabilizers
Certain oncology drugs

Documentation Requirements

The laboratory record should include:

Medication being monitored
Clinical reason for testing
Specimen collected
Test results
Ordering provider
Relevant patient history when required

Proper documentation supports medical necessity and helps justify repeat testing when ongoing monitoring is clinically appropriate.

Drug Assay Procedures (80305 to 83992)

Drug assay procedures identify or measure drugs, medications, alcohol, or other substances in biological specimens. Physicians use these tests to diagnose poisoning, monitor prescription medication use, evaluate treatment compliance, and detect substance misuse.

Pain management clinics, addiction treatment centers, emergency departments, occupational health providers, psychiatrists, and primary care physicians frequently order drug testing.

Common Drug Assay Services

Examples include:

Presumptive drug screening
Definitive drug testing
Toxicology testing
Alcohol testing
Drug confirmation testing
Substance identification

Drug assays may analyze urine, blood, saliva, or other approved specimens depending on the clinical situation.

Documentation Requirements

Laboratory documentation should include:

Clinical reason for testing
Ordering provider
Specimen type
Collection date and time
Testing methodology
Laboratory findings
Final interpretation when applicable

Proper documentation helps support medical necessity, especially when repeat testing occurs during ongoing treatment.

Billing Tips

Before submitting claims:

Confirm payer coverage policies.
Review documentation supporting medical necessity.
Verify the testing methodology.
Avoid duplicate billing for the same specimen.
Follow payer rules for presumptive and definitive testing.

Evocative and Suppression Testing (80400 to 80439)

Evocative and suppression tests evaluate endocrine gland function by measuring the body’s response after administering a medication or hormone.

Endocrinologists commonly order these studies when routine laboratory testing cannot confirm a diagnosis.

Common Clinical Applications

These studies help evaluate:

Pituitary disorders
Adrenal gland disorders
Thyroid dysfunction
Growth hormone abnormalities
Cushing syndrome
Adrenal insufficiency

Because many of these tests require multiple blood samples collected over several hours, documentation must remain complete and accurate throughout the testing period.

Documentation Requirements

Documentation should identify:

Test performed
Medication or hormone administered
Collection times
Laboratory measurements
Clinical indication
Physician interpretation

Incomplete timing documentation often causes coding and billing questions.

Clinical Pathology Consultations (80500 to 80502)

Clinical pathology consultation services allow pathologists to review complex laboratory findings and provide expert guidance to the treating physician.

Unlike routine laboratory reporting, these consultations require professional medical judgment.

Common Situations

Clinical pathology consultations may involve:

Complex laboratory abnormalities
Rare diseases
Hematology interpretation
Microbiology consultation
Coagulation disorders
Specialized laboratory findings

Documentation Requirements

The consultation record should include:

Clinical question
Laboratory data reviewed
Medical interpretation
Recommendations
Consulting pathologist’s documentation

These services require physician level analysis rather than automated laboratory reporting.

Urinalysis Procedures (81000 to 81099)

Urinalysis remains one of the most frequently ordered laboratory tests.

Healthcare providers use urinalysis to evaluate kidney function, urinary tract infections, diabetes, dehydration, liver disease, and many other conditions.

Common Urinalysis Services

Examples include:

Routine urinalysis
Microscopic urine examination
Urine chemistry testing
Pregnancy related urine testing
Protein evaluation
Glucose testing
Urine sediment examination

Documentation Requirements

The laboratory report should document:

Specimen source
Collection method
Laboratory findings
Microscopic observations when performed
Abnormal results
Final laboratory report

Accurate specimen identification helps prevent laboratory errors.

Molecular Pathology Procedures (81105 to 81479)

Molecular pathology examines DNA, RNA, and other genetic material to identify mutations associated with inherited disorders, infectious diseases, and cancer.

Precision medicine has increased the importance of molecular testing across many medical specialties.

Common Applications

Molecular pathology supports:

Cancer diagnosis
Targeted therapy selection
Hereditary disease testing
Pharmacogenomic testing
Infectious disease identification
Genetic carrier screening

Many oncology practices now rely on molecular testing before selecting treatment.

Documentation Requirements

Documentation should include:

Clinical indication
Gene or biomarker evaluated
Specimen type
Testing methodology
Laboratory findings
Pathologist interpretation when appropriate

Medical necessity remains especially important because many molecular tests have specific payer coverage requirements.

Billing Considerations

Before billing molecular pathology services:

Verify payer coverage.
Confirm prior authorization requirements.
Review laboratory documentation.
Ensure the diagnosis supports testing.
Confirm that the ordered test matches the performed analysis.

Genomic Sequencing Procedures (81410 to 81471)

Genomic sequencing analyzes larger portions of a patient’s genetic material than traditional molecular testing.

These advanced technologies help physicians diagnose rare diseases, guide precision medicine, and identify inherited genetic conditions.

Common Clinical Uses

Genomic sequencing supports:

Rare disease diagnosis
Oncology treatment planning
Pediatric genetic disorders
Cardiovascular genetics
Neurological disorders
Prenatal evaluation

These studies often require advanced laboratory equipment and highly specialized interpretation.

Documentation Requirements

The laboratory report should identify:

Sequencing method
Genes analyzed
Clinical indication
Laboratory findings
Interpretation
Ordering physician

Many insurers require documentation demonstrating that genomic sequencing is medically necessary before approving payment.

Multianalyte Assays with Algorithmic Analyses (81490 to 81599)

Multianalyte assays combine results from several laboratory markers with computer based algorithms to generate a single clinical score or diagnostic result.

These advanced laboratory tests continue to grow as precision medicine evolves.

Common Applications

Examples include:

Cancer risk assessment
Organ transplant monitoring
Cardiovascular risk evaluation
Autoimmune disease assessment
Precision oncology

Rather than reporting each biomarker separately, these tests combine multiple results into one clinically meaningful assessment.

Documentation Requirements

Documentation should include:

Test ordered
Clinical indication
Biomarkers analyzed
Algorithm based result
Laboratory interpretation
Ordering provider

Practices should also retain supporting laboratory records for audit purposes.

Common Billing Challenges for Advanced Laboratory Testing

Advanced laboratory services often present unique reimbursement challenges.

Common issues include:

Missing medical necessity documentation
Prior authorization requirements
Incorrect specimen documentation
Unsupported repeat testing
Incorrect payer selection
Missing physician orders
Outdated coding references

Regular internal audits help laboratories identify these issues before claim submission.

Best Practices for Laboratory Coding

Healthcare organizations can improve coding accuracy by following consistent processes.

Review the Complete Laboratory Report

Do not assign CPT codes from the physician order alone.

Always review the completed laboratory findings.

Confirm Medical Necessity

The diagnosis should support every laboratory service billed.

Verify Payer Policies

Coverage varies significantly for molecular pathology, genomic sequencing, and proprietary laboratory analyses.

Maintain Accurate Specimen Documentation

Clearly identify:

Specimen source
Collection date
Collection method
Testing laboratory

Stay Current with Annual CPT Updates

Laboratory coding changes frequently.

Practices should review annual CPT revisions and payer policy updates before submitting claims.

Conclusion

Accurate Pathology and Laboratory CPT coding supports quality patient care, timely reimbursement, and regulatory compliance. Every laboratory test, whether it involves routine blood work, advanced molecular diagnostics, microbiology, or surgical pathology, requires complete documentation and careful code selection.

The Pathology and Laboratory CPT section (0001U to 89398) covers a broad range of diagnostic services performed in hospitals, physician offices, independent laboratories, and specialty testing facilities. Understanding how these code ranges are organized helps coders, laboratory professionals, physicians, and revenue cycle teams navigate the CPT code set more efficiently.

Need Help with Laboratory Billing and CPT Coding?

Accurate pathology and laboratory coding requires more than selecting the correct CPT code. Proper documentation, payer-specific billing rules, modifier usage, and medical necessity all play a critical role in maximizing reimbursement and reducing claim denials.

At UControl Billing, our certified medical billing and coding specialists help independent laboratories, physician practices, hospitals, and diagnostic centers streamline the entire revenue cycle, from accurate CPT coding and claims submission to denial management, payment posting, and accounts receivable follow-up.

Whether you perform routine laboratory testing, molecular pathology, genomic sequencing, or surgical pathology services, our team ensures your claims are coded correctly and submitted in compliance with current CPT and payer guidelines.

Partner with UControl Billing today to improve collections, reduce denials, and optimize your laboratory revenue cycle across the United States.

Contact UControl Billing today for a free revenue cycle assessment and discover how our nationwide medical billing services can help your practice collect more while staying compliant.

Frequently Asked Questions

What are Pathology and Laboratory CPT codes?

Pathology and Laboratory CPT codes describe laboratory tests and pathology services used to diagnose diseases, monitor treatment, evaluate organ function, identify infections, and support clinical decision making. Healthcare providers use these codes for documentation, insurance claims, and reimbursement.

What CPT code range covers Pathology and Laboratory services?

The Pathology and Laboratory section includes CPT codes 0001U through 89398.

The section covers:

Proprietary Laboratory Analyses
Organ or Disease Oriented Panels
Drug Assays
Molecular Pathology
Genomic Sequencing
Chemistry
Hematology
Immunology
Microbiology
Surgical Pathology
Cytopathology
Reproductive Medicine
And several other laboratory specialties

Who commonly uses Pathology and Laboratory CPT codes?

These codes support many healthcare professionals, including:

Independent laboratories
Hospital laboratories
Pathologists
Medical laboratory scientists
Physicians
Medical coders
Medical billers
Revenue cycle professionals
Healthcare administrators

What documentation is required for laboratory CPT coding?

Documentation should include:

Physician order
Medical necessity
Patient diagnosis
Specimen type
Collection date and time
Laboratory methodology, when appropriate
Test results
Pathologist interpretation, when required

Complete documentation helps support accurate coding and reimbursement.

What are Proprietary Laboratory Analyses (PLA) codes?

PLA codes identify specialized laboratory tests developed by individual laboratories or manufacturers. These tests often involve advanced molecular diagnostics, genomic analysis, or precision medicine technologies.

Because many PLA tests have unique payer requirements, providers should verify coverage before submitting claims.

What is the difference between molecular pathology and genomic sequencing?

Molecular pathology focuses on analyzing specific genes or genetic mutations associated with disease.

Genomic sequencing evaluates larger portions of a patient’s DNA or multiple genes simultaneously to identify inherited conditions, guide precision medicine, or support cancer treatment planning.