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Dr. Gregory John Duncan, MD
NPI1164459921
- Medicare services, 2020
- 1,645
- Part D claims, 2019
- 33
- Publications
- 1
- Hospital affiliations
- 2
- State license
- 1
- Practice address
- 2825 E Barnett Road, Medford, OR 97504
- Practice phone
- Call (541) 789-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Gregory John Duncan is an orthopedic surgeon in Medford, Oregon
Dr. Duncan practices at Asante Rogue Regional Medical Center in Medford, Oregon, part of Asante Health System.
Dr. Duncan's NPI, 1164459921, was assigned on June 27, 2006. Dr. Duncan holds California license A44032.
NPI and contact details
- NPI
- 1164459921NPI Registry (opens in a new tab)
- NPI enumeration date
- June 27, 2006
- NPI status
- Active
- Practice phone
- (541) 789-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gregory John Duncan practices at Asante Rogue Regional Medical Center in Medford, Oregon
Dr. Duncan's primary practice is Asante Rogue Regional Medical Center, at 2825 E Barnett Road, Medford, OR 97504 in Jackson County. The practice phone is (541) 789-7000.
- Asante Rogue Regional Medical Center2825 E Barnett Road, Medford, OR 97504 · Jackson CountyPhone(541) 789-7000
Source: Dmand AI Affiliation Data
Dr. Gregory John Duncan is affiliated with 2 sites of care
Dr. Duncan's primary practice is Asante Rogue Regional Medical Center in Medford, Oregon, part of Asante Health System. Dmand AI also links Dr. Duncan to 1 hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory John Duncan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Duncan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Asante Rogue Regional Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Gregory John Duncan is one of 270 orthopedic surgeons in Oregon
Orthopaedic surgery is Dr. Duncan's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Duncan is licensed in California.
Specialties and state licenses
- Orthopaedic surgery, CaliforniaPrimary
Orthopedic surgeons near Dr. Duncan
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
270orthopedic surgeons in Oregon13orthopedic surgeons in Medford7orthopedic surgeons at Asante Rogue Regional Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory John Duncan billed Medicare for 1,645 services in 2020
CMS data shows 1,645 Medicare services from Dr. Duncan across 12 procedure codes in 2020. Medicare paid $41,738 for them. Every service was in an office.
Medicare services, 20201,645
Paid by Medicare$41,738
Procedure codes12
Dr. Duncan's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Drugs given in the office
- 2019: 2,4672020: 91163%
- Office and hospital visits
- 2019: 1,0472020: 35366%
- Surgery
- 2019: 8972020: 31765%
- Imaging
- 2019: 3562020: 6482%
Dr. Duncan compared with the Oregon median for orthopedic surgeons, 2020
- Dr. Duncan
- Oregon median
- Medicare services
- 1,645vs 4483.7 times
- Part D claims
- 33vs 6247% below
Medians across 264 orthopedic surgeons in Oregon with Dmand AI profiles that report each measure.
Dr. Duncan's most billed Medicare procedure codes, 2020
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. Duncan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Duncan and other orthopedic surgeons in Oregon.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory John Duncan's patients have a median age of 68
Across all payers, Dmand AI patient panel data puts Dr. Duncan's median patient age at 68, with 47% women.
Dr. Duncan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women47%
- Men53%
Source: Dmand AI Patient Panel Data
Dr. Gregory John Duncan wrote 33 Medicare Part D claims in 2019
In 2019, Dr. Duncan wrote 33 Medicare Part D claims. They cover 2 drugs, with $186 in total drug cost. In 2018, CMS named 18 claims across 1 drug.
Part D claims, 201933
Drugs named by CMS2
Total drug cost$186
Dr. Duncan's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 182019: 3383%
Drugs named by CMS: 2 in 2019, 1 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
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Dr. Gregory John Duncan has 1 publication on record
Dmand AI links 1 paper to Dr. Duncan.
Papers1
Recent publications by Dr. Duncan
See who Dr. Duncan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Duncan works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Sources for Dr. Gregory John Duncan'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Gregory John Duncan
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. Gregory John Duncan's NPI number?
Dr. Gregory John Duncan's NPI number is 1164459921. It was assigned on June 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory John Duncan?
Dr. Gregory John Duncan is an orthopedic surgeon in Medford, Oregon. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Gregory John Duncan practice?
Dr. Duncan practices at 2825 E Barnett Road, Medford, OR 97504. Dr. Duncan's primary practice is Asante Rogue Regional Medical Center in Medford, Oregon, part of Asante Health System. Dmand AI also links Dr. Duncan to 1 hospital.
What is Dr. Gregory John Duncan's office phone number?
The practice phone on file for Dr. Duncan is (541) 789-7000.
What is Dr. Gregory John Duncan's medical license number?
Dr. Duncan holds California license A44032.
Which hospitals is Dr. Gregory John Duncan affiliated with?
Dr. Duncan practices at Asante Rogue Regional Medical Center in Medford, Oregon. Dmand AI links Dr. Duncan to 1 more hospital.
Does Dr. Gregory John Duncan accept Medicare?
Yes. CMS data shows Dr. Duncan billed Medicare for 1,645 services in 2020.
What services does Dr. Gregory John Duncan bill to Medicare?
In 2020, Dr. Duncan's most billed Medicare services were injected or infused drug (J3301), surgery: bones and joints (20610) and office visit, established patient (99213).
What drugs does Dr. Gregory John Duncan prescribe most?
In 2019 Medicare Part D data, Dr. Duncan's most prescribed drugs by claims were Hydrocodone-Acetaminophen and Cephalexin.
How long has Dr. Gregory John Duncan been practicing?
Dr. Duncan's NPI was assigned in 2006.
Does Dr. Gregory John Duncan do research?
Dmand AI links 1 publication to Dr. Duncan.
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