Gregory James Thomas, DDS, MS
- Medicare services, 2023
- 73
- Part D claims, 2024
- 120
- Industry payments
- $6,122
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 29427 Ryan Rd, Warren, MI 48092-2203
- Practice phone
- Call (586) 755-9340
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd)
Dental practice · Warren, Michigan
Find Gregory Thomas' professional email, personal email and mobile number
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Gregory James Thomas is an oral and maxillofacial surgery (d.m.d.) in Warren, Michigan
Gregory Thomas practices at Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd) in Warren, Michigan.
Gregory Thomas' NPI, 1912947227, was assigned on June 7, 2006. Gregory Thomas graduated from University of Detroit Mercy School of Dentistry in 1984. Gregory Thomas holds Michigan license 2901013883.
- NPI
- 1912947227NPI Registry (opens in a new tab)
- NPI enumeration date
- June 7, 2006
- NPI status
- Active
- Practice phone
- (586) 755-9340
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Gregory James Thomas practices at 2 locations in Warren, Michigan
Gregory Thomas' primary practice is Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd), at 29427 Ryan Rd, Warren, MI 48092-2203. The practice phone is (586) 755-9340. The NPI Registry lists Gregory Thomas' practice address as 29425 Ryan Rd, Warren, MI 48092.
- Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd)Primary29427 Ryan Rd, Warren, MI 48092-2203Phone(586) 755-9340
- NPI Registry address29425 Ryan Rd, Warren, MI 48092 · Macomb CountyPhone(586) 755-9340
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Gregory James Thomas is affiliated with 1 site of care and 1 medical group
Gregory Thomas' primary practice is Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd) in Warren, Michigan. Dmand AI also links Gregory Thomas to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Gregory James Thomas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gregory Thomas practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd) | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Gregory James Thomas is one of 44 orals and maxillofacial surgery (d.m.d.)s in Michigan
Oral and maxillofacial surgery is Gregory Thomas' primary specialty in the NPI Registry, under taxonomy code 204E00000X. Gregory Thomas is licensed in Michigan.
Specialties and state licenses
- Oral and maxillofacial surgery (d.m.d.), MichiganPrimary
Orals and maxillofacial surgery (d.m.d.)s near Gregory Thomas
Counts of orals and maxillofacial surgery (d.m.d.)s 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
Gregory James Thomas billed Medicare for 73 services in 2023
CMS data shows 73 Medicare services from Gregory Thomas across 4 procedure codes in 2023. Medicare paid $3,151 for them. Every service was in an office.
Gregory Thomas' Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 742023: 5032%
- Imaging
- 2022: 392023: 2341%
- Tests and treatments
- 2022: 132023: 0100%
Gregory Thomas compared with the Michigan median for orals and maxillofacial surgery (d.m.d.)s, 2023
- Gregory Thomas
- Michigan median
- Medicare services
- 73vs 213.5 times
- Part D claims
- 105vs 23255% below
Medians across 50 orals and maxillofacial surgery (d.m.d.)s in Michigan with Dmand AI profiles that report each measure.
Gregory Thomas' most billed Medicare procedure codes, 2023
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 Gregory Thomas?
Medicare shows one payer. Book a meeting to get commercial claims data for Gregory Thomas and other orals and maxillofacial surgery (d.m.d.)s in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Gregory James Thomas' patients have a median age of 51
Across all payers, Dmand AI patient panel data puts Gregory Thomas' median patient age at 51, with 42% women.
Gregory Thomas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women42%
- Men58%
Source: Dmand AI Patient Panel Data
Gregory James Thomas wrote 120 Medicare Part D claims in 2024
In 2024, Gregory Thomas wrote 120 Medicare Part D claims for 39 patients. 100% of them were for generic drugs. CMS names the drug for 105 of them, across 4 drugs with 11 or more claims each, at $411 in total drug cost. In 2023, CMS named 786 claims across 10 drugs.
Gregory Thomas' 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 Gregory Thomas' Part D claims, 2024
- Opioids19%23 of 120 claims
- Antibiotics27%32 of 120 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: 7862024: 10587%
Drugs named by CMS: 4 in 2024, 10 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
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Gregory James Thomas received $6,122 in industry payments from 2016 to 2025
CMS Open Payments shows 70 general payments to Gregory Thomas from 9 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 52% of the total. Zimmer Biomet Holdings, Inc. paid the most, $4,962.
General payments to Gregory Thomas by program year, 2016 to 2025
General payments to Gregory Thomas by kind, 2016 to 2025
- Travel and lodging$3,18752%
- Food and beverage$2,86647%
- Gifts$691%
Companies that paid Gregory Thomas the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Gregory James Thomas graduated from University of Detroit Mercy School of Dentistry
Gregory Thomas graduated from University of Detroit Mercy School of Dentistry in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Gregory James Thomas'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Gregory James Thomas
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What is Gregory James Thomas' NPI number?
Gregory James Thomas' NPI number is 1912947227. It was assigned on June 7, 2006, and it is active in the NPI Registry.
What does Gregory James Thomas specialize in?
Gregory James Thomas is an oral and maxillofacial surgery (d.m.d.) in Warren, Michigan. The primary specialty in the NPI Registry is Oral & Maxillofacial Surgery (D.M.D.) (taxonomy code 204E00000X).
Where does Gregory James Thomas practice?
Gregory Thomas practices at 29427 Ryan Rd, Warren, MI 48092-2203. Gregory Thomas also practices at 29425 Ryan Rd, Warren, MI 48092. Gregory Thomas' primary practice is Summit Oral & Maxillofacial Surgery - Warren (29427 Ryan Rd) in Warren, Michigan. Dmand AI also links Gregory Thomas to 1 medical group.
What is Gregory James Thomas' office phone number?
The practice phone on file for Gregory Thomas is (586) 755-9340.
What is Gregory James Thomas' medical license number?
Gregory Thomas holds Michigan license 2901013883.
Does Gregory James Thomas accept Medicare?
Yes. CMS data shows Gregory Thomas billed Medicare for 73 services in 2023.
What services does Gregory James Thomas bill to Medicare?
In 2023, Gregory Thomas' most billed Medicare services were diagnostic imaging (70355), office visit, new patient (99202) and office visit, established patient (99212).
Where did Gregory James Thomas go to medical school?
Gregory Thomas graduated from University of Detroit Mercy School of Dentistry in 1984.
What drugs does Gregory James Thomas prescribe most?
In 2024 Medicare Part D data, Gregory Thomas' most prescribed drugs by claims were Chlorhexidine Gluconate, Amoxicillin and Tramadol HCl.
Has Gregory James Thomas received payments from drug or device companies?
CMS Open Payments shows $6,122 in general payments to Gregory Thomas from 9 companies from 2016 to 2025. The largest total came from Zimmer Biomet Holdings, Inc.
How long has Gregory James Thomas been practicing?
Gregory Thomas graduated from medical school in 1984, 42 years ago.
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