Dr. Gregg Wendell Schellack, DO
- Medicare services, 2022
- 357
- Part D claims, 2024
- 108
- Hospital affiliations
- 2
- Industry payments
- $2,623
- Medical group
- 1
- Practice address
- 10 Kruger Rd, Plains, MT 59859
- Practice phone
- Call (406) 826-4800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Gregg Wendell Schellack is an orthopedic surgeon in Plains, Montana
Dr. Schellack practices at Clark Fork Valley Hospital in Plains, Montana, part of Clark Fork Valley Hospital.
Dr. Schellack's NPI, 1205887544, was assigned on May 12, 2006. Dr. Schellack holds Montana license PHYS-35111.
- NPI
- 1205887544NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7315127180
- NPI enumeration date
- May 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (406) 826-4800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregg Wendell Schellack practices at Clark Fork Valley Hospital in Plains, Montana
Dr. Schellack's primary practice is Clark Fork Valley Hospital, at 10 Kruger Rd, Plains, MT 59859 in Sanders County. The practice phone is (406) 826-4800.
- Clark Fork Valley Hospital10 Kruger Rd, Plains, MT 59859 · Sanders CountyPhone(406) 826-4800
Source: Dmand AI Affiliation Data
Dr. Gregg Wendell Schellack is affiliated with 4 sites of care and 1 medical group
Dr. Schellack's primary practice is Clark Fork Valley Hospital in Plains, Montana, part of Clark Fork Valley Hospital. Dr. Schellack is also affiliated with Providence St. Patrick Hospital. The medical group on file is Clark Fork Valley Hospital. Dmand AI also links Dr. Schellack to 1 more hospice and 1 skilled nursing facility, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregg Wendell Schellack's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Schellack practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Clark Fork Valley Hospital | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Clark Fork Valley Hospital and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Gregg Wendell Schellack is one of 99 orthopedic surgeons in Montana
Orthopaedic surgery is Dr. Schellack's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Schellack is licensed in Montana.
Specialties and state licenses
- Orthopaedic surgery, MontanaPrimary
Orthopedic surgeons near Dr. Schellack
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregg Wendell Schellack billed Medicare for 357 services in 2022
CMS data shows 357 Medicare services from Dr. Schellack across 5 procedure codes in 2022. Medicare paid $13,224 for them. Every service was in an office.
Dr. Schellack's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 2482022: 18027%
- Drugs given in the office
- 2021: 822022: 12755%
- Surgery
- 2021: 912022: 5045%
- Imaging
- 2021: 1132022: 0100%
- Tests and treatments
- 2021: 8392022: 0100%
Dr. Schellack compared with the Montana median for orthopedic surgeons, 2022
- Dr. Schellack
- Montana median
- Medicare services
- 357vs 61242% below
- Part D claims
- 92vs 7031% above
Medians across 104 orthopedic surgeons in Montana with Dmand AI profiles that report each measure.
Dr. Schellack's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Schellack?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Schellack and other orthopedic surgeons in Montana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregg Wendell Schellack's patients have a median age of 72
Across all payers, Dmand AI patient panel data puts Dr. Schellack's median patient age at 72, with 58% women.
Dr. Schellack's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women58%
- Men42%
Source: Dmand AI Patient Panel Data
Dr. Gregg Wendell Schellack wrote 108 Medicare Part D claims in 2024
In 2024, Dr. Schellack wrote 108 Medicare Part D claims for 39 patients. 100% of them were for generic drugs. CMS names the drug for 92 of them, across 4 drugs with 11 or more claims each, at $450 in total drug cost. In 2023, CMS named 146 claims across 5 drugs.
Dr. Schellack's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Schellack's Part D claims, 2024
- Opioids49%53 of 108 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1462024: 9237%
Drugs named by CMS: 4 in 2024, 5 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Gregg Wendell Schellack takes part in Medicare
Dr. Schellack accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Hip replacement: 1 to 10 procedures (CMS shows small counts as a range)
Knee replacement: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gregg Wendell Schellack received $2,623 in industry payments from 2016 to 2025
CMS Open Payments shows 24 general payments to Dr. Schellack from 3 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 80% of the total. Stryker Corporation paid the most, $2,328.
General payments to Dr. Schellack by program year, 2016 to 2025
General payments to Dr. Schellack by kind, 2016 to 2025
- Travel and lodging$2,09380%
- Food and beverage$43116%
- Education$984%
Companies that paid Dr. Schellack the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gregg Wendell Schellack's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregg Wendell Schellack
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregg Wendell Schellack's NPI number?
Dr. Gregg Wendell Schellack's NPI number is 1205887544. It was assigned on May 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregg Wendell Schellack?
Dr. Gregg Wendell Schellack is an orthopedic surgeon in Plains, Montana. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Gregg Wendell Schellack practice?
Dr. Schellack practices at 10 Kruger Rd, Plains, MT 59859. Dr. Schellack's primary practice is Clark Fork Valley Hospital in Plains, Montana, part of Clark Fork Valley Hospital. Dmand AI also links Dr. Schellack to 1 hospice and 1 skilled nursing facility.
What is Dr. Gregg Wendell Schellack's office phone number?
The practice phone on file for Dr. Schellack is (406) 826-4800.
What is Dr. Gregg Wendell Schellack's medical license number?
Dr. Schellack holds Montana license PHYS-35111.
Which hospitals is Dr. Gregg Wendell Schellack affiliated with?
Dr. Schellack practices at Clark Fork Valley Hospital in Plains, Montana. Dr. Schellack is also affiliated with Providence St. Patrick Hospital.
What medical group is Dr. Gregg Wendell Schellack part of?
Dr. Schellack is linked to Clark Fork Valley Hospital.
Does Dr. Gregg Wendell Schellack accept Medicare?
Yes. CMS data shows Dr. Schellack billed Medicare for 357 services in 2022, and Dr. Schellack accepts Medicare assignment.
What services does Dr. Gregg Wendell Schellack bill to Medicare?
In 2022, Dr. Schellack's most billed Medicare services were injected or infused drug (J3301), office visit, established patient (99213) and surgery: bones and joints (20610).
What drugs does Dr. Gregg Wendell Schellack prescribe most?
In 2024 Medicare Part D data, Dr. Schellack's most prescribed drugs by claims were Oxycodone-Acetaminophen, Naproxen and Hydrocodone-Acetaminophen.
Has Dr. Gregg Wendell Schellack received payments from drug or device companies?
CMS Open Payments shows $2,623 in general payments to Dr. Schellack from 3 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Gregg Wendell Schellack been practicing?
Dr. Schellack graduated from medical school in 2003, 23 years ago.
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