Welcome to Yellowstone Pathology Institute

YPI is an independent reference laboratory serving many clients throughout Montana, northern Wyoming, and eastern Idaho. YPI provides the highest level of anatomic and clinical pathology results because of its commitment to quality, patient care, expertise, and professionalism. Our mission is to enhance patient care by providing the highest quality anatomic pathology and ancillary diagnostic services, consultation, education and esoteric testing development solutions.

Yellowstone Pathology Institute (YPI) offers renowned capabilities in a broad range of specialty diagnostic services, including the very latest in advanced molecular testing. Our pathologists are board certified in anatomic and clinical pathology and are fellowship-trained in their respective subspecialties including: cytopathology, dermatopathology, gastro/hepatic pathology, hematopathology, molecular pathology. They are nationally recognized and serve on numerous advisory committees.

We are dedicated to excellence in diagnostic pathology services for our clients and their patients. Our laboratory is CLIA (Clinical Laboratory Improvement Act) certified through CMS (Centers of Medicare and Medicaid Services) and the State of Montana, and is accredited by the CAP (College of American Pathologists). [View CLIA Certificate] [View CAP Certificate] [View Cody,WY lab CLIA Certificate]

Reliable, Personable Service

Each of our employees is trained to watch over your account to ensure specimens arrive safely, tests are performed accurately and reports are sent out promptly. Each specimen is carefully tracked to ensure you and your patients receive the highest quality testing services available.

Supplies and Specimen Transport

YPI provides our clients with all the supplies necessary for the collection and transport of patient specimens. Our specimen transport systems ensure that your specimens arrive in our laboratory quickly and safely, utilizing private and commercial couriers.
Web Client Order Supply Form

Rapid Results

Results of most routine tests are available in less than 48 hours. For complex or urgent cases, our pathologist will immediately contact you personally with the results.


YPI is a participating provider for a comprehensive list of insurance companies and will bill your insurance on your behalf, if provided by the patient’s service provider.  It is, however, the patient’s responsibility to contact their insurance company and verify that Yellowstone Pathology is “in-network”.

YPI will bill all copays, coinsurance, out-of-pocket, out-of-network, and deductibles directly to the patient.

Uninsured patients should contact YPI for all billing questions.


We would like your feedback!  Please let us know how we’re doing.

Lab Hours

Monday-Friday: 8:30 am to 5:00 pm

Hematopathology services are available any time of the day or night, including weekends and holidays, to assist our referring physicians in treating their patients promptly.

Our pathologists are always available for consultation when it is most convenient for physicians.

For more information, call 1.888.400.6640 today to speak with our knowledgeable staff.

Notice of Privacy Practices

Discrimination is Against the Law

Yellowstone Pathology Institute, Inc. and Yellowstone Pathologists, P.C., complies with applicable Federal civil rights laws and does not discriminate on the basis of race, color, national origin, age, disability, or gender.

If you should require the services of a translator or interpreter to communicate with our staff, our practice will provide them but an appointment will need to be scheduled to accommodate your needs.

Discrimination Statement

Billings, Montana:
2900 12th Avenue North, Suite 295W
Billings, MT 59101
phone 406.238.6360
fax 406.238.6361
toll-free 1.888.400.6640
Bozeman, Montana: 
931 Highland Boulevard, Suite 3225
Bozeman, MT 59715
phone 406.414.1004
fax 406.414.5445
toll-free 1.888.400.6640