Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Gregg Wendell Schellack, DO

Individual provider Orthopaedic Surgery Physician · NPI 1205887544

Dr. Gregg Wendell Schellack, DO practises Orthopedic Surgery in Livingston, Montana. Qualified in 2003, 23 years ago. Practices with Plains Hospital Corporation, a 29-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Montana.

Years since qualifying
23
Licensed in
MT
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

320 Alpenglow Ln
Livingston, MT 59047-8506
Phone: (406) 222-3541
Fax: (406) 222-7606
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 600 Mt Highway 91 S, Dillon, MT 59725-7379 — (406) 683-3000

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence PHYS-35111 (MT)

Record details

NPI number1205887544
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 12, 2006
Last updated in NPPESAugust 21, 2024
Certification dateAugust 21, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolOTHER
Graduated 2003 (23 years in practice)
Group practice Plains Hospital Corporation — 29 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Hip replacement 1–10 times
Knee replacement 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $15 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Plains Hospital Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 29 clinicians in the practice; 12 are shown here.

Other providers in Livingston