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CPT 87250: Viral Isolation in Embryonated Egg or Small Animal

CPT code 87250 represents a specialized virology laboratory procedure for isolating viruses by inoculating embryonated eggs or small animals and observing viral growth, including dissection when needed. This code is significant nationally because it captures diagnostic and research activities that support infectious disease identification, outbreak response, and public health surveillance. It is used by hospital and commercial laboratories, public health agencies, and reference laboratories when culture-based isolation is required.

Key payers commonly involved in coverage for this service include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on the clinical purpose of the procedure, typical settings where it is performed, and the role this service plays in diagnostic workflows. The publication summarizes billing and coding considerations, common modifiers used with lab services, and related clinical implications for laboratory operations. It also highlights national relevance for surveillance and specialty diagnostic pathways. Data not available in the input will be noted where applicable, including payer-specific reimbursement rates and procedure volume benchmarks.

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Billing Code Overview

CPT code 87250 describes a laboratory procedure in which a lab analyst isolates a virus by inoculating a developing embryo in an egg or a small animal, allowing the virus to grow, and observing for signs of viral growth, which may include dissection for direct observation. This service is a viral isolation procedure used to obtain live virus for identification and characterization.

Service type: Viral isolation and culture using embryonated eggs or small animals
Typical site of service: Clinical or public health laboratories, research laboratories, and specialized diagnostic virology facilities

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CPT 87250: Viral Isolation in Embryonated Egg or Small Animal

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Billing Code Overview

Service type: Viral isolation and culture using embryonated eggs or small animals
Typical site of service: Clinical or public health laboratories, research laboratories, and specialized diagnostic virology facilities

Clinical & Coding Specifications

Clinical Context

A mid-40s patient presents to a hospital infectious disease laboratory after a clinician suspects a viral etiology for an acute febrile respiratory illness that has not yielded a definitive diagnosis by rapid antigen testing and molecular assays. A respiratory specimen (nasopharyngeal swab or aspirate) or tissue sample is delivered to the virology lab. The virology technologist inoculates the specimen into embryonated eggs or a susceptible small animal model to attempt viral isolation. The sample is incubated and observed over several days for cytopathic effects, embryonic death, or other signs of viral growth; dissection and direct observation may be performed to identify characteristic lesions. Results are used to confirm viable virus, enable further typing, culture-based susceptibility testing, or preparation of isolates for public health reference laboratories.

Typical site of service: Hospital clinical virology laboratory, public health laboratory, or specialized research/diagnostic laboratory with biosafety facilities.

Typical patient scenario: A patient hospitalized with pneumonia and worsening hypoxia after negative initial PCR panels, where isolation is pursued to detect unusual or culture-requiring pathogens (for example, certain influenza strains, orthomyxoviruses, or other agents requiring culture for characterization). The laboratory documents specimen accession, inoculation, incubation, observation, and any dissection performed as part of the isolation process.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing separately for the laboratory professional's interpretation, if applicable and payer allows.
`59`	Distinct procedural service	Data not available in the input.
`62`	Two surgeons	Use when two qualified laboratory physicians or surgeons share responsibility for a technically complex isolation procedure involving surgical animal inoculation or dissection requiring two practitioners.
`78`	Unplanned return to the operating/procedure room by the same physician following initial procedure	Use if an unplanned repeat inoculation or dissection is required under the same encounter due to complication or failure of initial isolation attempt.
`80`	Assistant surgeon	Use when an assistant is documented assisting with the dissection or technical aspects of the animal inoculation.
`90`	Reference (outside) laboratory	Use when the specimen or service is performed by an outside reference laboratory rather than the billing laboratory.
`91`	Repeat clinical diagnostic laboratory test	Data not available in the input.
`QK`	Locum tenens physician – replacement of a regularly employed physician	Use when a locum tenens pathologist performs the professional component of the test.
`QX`	CRNA service: CRNA with medical direction by a physician	Data not applicable — rarely used for this lab procedure unless anesthesia support is billed for animal procedures.
`TC`	Technical component	Use to report only the technical component of the service (specimen handling, inoculation, incubation, observation, and dissection).

Taxonomy Code	Specialty	Notes
207R00000X	Pathology	Clinical pathologists and medical microbiologists who supervise viral isolation and interpret results.
174400000X	Infectious Disease	Infectious disease physicians who order and consult on interpretation of isolation results.
163W00000X	Laboratory Director (Clinical Lab)	Clinical laboratory directors who oversee virology laboratory procedures.
382N00000X	Medical Laboratory Technologist/Clinical Laboratory Scientist	Technologists performing inoculation, incubation, and observation tasks.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J12.9`	Viral pneumonia, unspecified	Viral isolation may be pursued when a patient has pneumonia and pathogen confirmation by culture is needed.
`J18.9`	Pneumonia, unspecified organism	When non-specific pneumonia workup requires culture to identify an uncommon viral cause.
`B34.9`	Viral infection, unspecified	General indication for virology testing including isolation when specific tests are inconclusive.
`J11.1`	Influenza due to identified novel influenza A virus with other respiratory manifestations	Isolation may be performed for strain identification and public health reporting.
`A49.9`	Bacterial infection, unspecified	Included as differential diagnosis where both bacterial culture and viral isolation may be performed concurrently.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87240`	Infectious agent antigen detection by immunofluorescent technique, direct; single step	Performed prior to culture to attempt rapid antigen detection and guide need for viral isolation.
`87536`	Infectious agent detection by nucleic acid (DNA or RNA); influenza virus, includes reverse transcription when performed	Molecular testing often precedes or accompanies culture; negative molecular results with high clinical suspicion may prompt culture via `87250`.
`87100`	Cultivation, bacterial, with isolation and presumptive identification of isolates	Bacterial culture analogue commonly performed in parallel for differential diagnosis of infection.
`87252`	Viral serology by immunofluorescent technique (indirect)	Serologic testing may be used adjunctively while viral isolation is pursued for definitive identification.
`87420`	Infectious agent antigen detection by enzyme immunoassay for respiratory syncytial virus	Example of rapid antigen testing that may be performed before resorting to viral isolation in eggs or animals.

CPT 87252: Viral Culture Identification by Tissue Culture

CPT-87253-VIRAL-IDENTIFICATION-AFTER-TISSUE-CULTURE

CPT 87253: Viral Identification After Tissue Culture

CPT-87254-SHELL-VIAL-VIRAL-CULTURE-IMMUNOFLUORESCENCE

CPT 87254: Shell Vial Viral Culture with Immunofluorescence

CPT-87255-VIRAL-IDENTIFICATION-CELL-IMPACT-ANALYSIS

CPT 87255: Viral Identification by Cell Impact Analysis

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

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Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Typical site of service: Hospital clinical virology laboratory, public health laboratory, or specialized research/diagnostic laboratory with biosafety facilities.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing separately for the laboratory professional's interpretation, if applicable and payer allows.
`59`	Distinct procedural service	Data not available in the input.
`62`	Two surgeons	Use when two qualified laboratory physicians or surgeons share responsibility for a technically complex isolation procedure involving surgical animal inoculation or dissection requiring two practitioners.
`78`	Unplanned return to the operating/procedure room by the same physician following initial procedure	Use if an unplanned repeat inoculation or dissection is required under the same encounter due to complication or failure of initial isolation attempt.
`80`	Assistant surgeon	Use when an assistant is documented assisting with the dissection or technical aspects of the animal inoculation.
`90`	Reference (outside) laboratory	Use when the specimen or service is performed by an outside reference laboratory rather than the billing laboratory.
`91`	Repeat clinical diagnostic laboratory test	Data not available in the input.
`QK`	Locum tenens physician – replacement of a regularly employed physician	Use when a locum tenens pathologist performs the professional component of the test.
`QX`	CRNA service: CRNA with medical direction by a physician	Data not applicable — rarely used for this lab procedure unless anesthesia support is billed for animal procedures.
`TC`	Technical component	Use to report only the technical component of the service (specimen handling, inoculation, incubation, observation, and dissection).

Taxonomy Code	Specialty	Notes
207R00000X	Pathology	Clinical pathologists and medical microbiologists who supervise viral isolation and interpret results.
174400000X	Infectious Disease	Infectious disease physicians who order and consult on interpretation of isolation results.
163W00000X	Laboratory Director (Clinical Lab)	Clinical laboratory directors who oversee virology laboratory procedures.
382N00000X	Medical Laboratory Technologist/Clinical Laboratory Scientist	Technologists performing inoculation, incubation, and observation tasks.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J12.9`	Viral pneumonia, unspecified	Viral isolation may be pursued when a patient has pneumonia and pathogen confirmation by culture is needed.
`J18.9`	Pneumonia, unspecified organism	When non-specific pneumonia workup requires culture to identify an uncommon viral cause.
`B34.9`	Viral infection, unspecified	General indication for virology testing including isolation when specific tests are inconclusive.
`J11.1`	Influenza due to identified novel influenza A virus with other respiratory manifestations	Isolation may be performed for strain identification and public health reporting.
`A49.9`	Bacterial infection, unspecified	Included as differential diagnosis where both bacterial culture and viral isolation may be performed concurrently.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87240`	Infectious agent antigen detection by immunofluorescent technique, direct; single step	Performed prior to culture to attempt rapid antigen detection and guide need for viral isolation.
`87536`	Infectious agent detection by nucleic acid (DNA or RNA); influenza virus, includes reverse transcription when performed	Molecular testing often precedes or accompanies culture; negative molecular results with high clinical suspicion may prompt culture via `87250`.
`87100`	Cultivation, bacterial, with isolation and presumptive identification of isolates	Bacterial culture analogue commonly performed in parallel for differential diagnosis of infection.
`87252`	Viral serology by immunofluorescent technique (indirect)	Serologic testing may be used adjunctively while viral isolation is pursued for definitive identification.
`87420`	Infectious agent antigen detection by enzyme immunoassay for respiratory syncytial virus	Example of rapid antigen testing that may be performed before resorting to viral isolation in eggs or animals.

CPT 87252: Viral Culture Identification by Tissue Culture

CPT-87253-VIRAL-IDENTIFICATION-AFTER-TISSUE-CULTURE

CPT 87253: Viral Identification After Tissue Culture

CPT-87254-SHELL-VIAL-VIRAL-CULTURE-IMMUNOFLUORESCENCE

CPT 87254: Shell Vial Viral Culture with Immunofluorescence

CPT-87255-VIRAL-IDENTIFICATION-CELL-IMPACT-ANALYSIS

CPT 87255: Viral Identification by Cell Impact Analysis

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 87250: Viral Isolation in Embryonated Egg or Small Animal

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Billing Code Overview

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CPT 87250: Viral Isolation in Embryonated Egg or Small Animal

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

CPT 87250: Viral Isolation in Embryonated Egg or Small Animal

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Billing Code Overview

CPT 87250: Viral Isolation in Embryonated Egg or Small Animal

Sign up for cpt 87250 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What does CPT 87250 represent and where is this service typically performed?

Which billing modifiers are relevant to CPT 87250 and when are they used?

What other tests are commonly related to or performed before using CPT 87250?

When is viral isolation with CPT 87250 clinically indicated and which diagnoses are related?

Which payers cover CPT 87250 and what is its broader clinical or public health role?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What does CPT 87250 represent and where is this service typically performed?

Which billing modifiers are relevant to CPT 87250 and when are they used?

What other tests are commonly related to or performed before using CPT 87250?

When is viral isolation with CPT 87250 clinically indicated and which diagnoses are related?

Which payers cover CPT 87250 and what is its broader clinical or public health role?

References