Dr. John Thomas Gregg, MD
- Medicare services, 2024
- 182
- Medicare patients, 2024
- 189
- Part D claims, 2024
- 82
- Industry payments
- $44
- Affiliated sites
- 1
- Practice address
- 5800 S Coulter St, Amarillo, TX 79119
- Practice phone
- Call (806) 641-6016
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Amarillo South Texas Emergency Center
Amarillo, Texas
Find Dr. Gregg's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Thomas Gregg is a general surgeon in Amarillo, Texas
Dr. Gregg practices at Amarillo South Texas Emergency Center in Amarillo, Texas.
Dr. Gregg's NPI, 1184605917, was assigned on November 9, 2005. Dr. Gregg holds Oklahoma license 17854.
- NPI
- 1184605917NPI Registry (opens in a new tab)
- NPI enumeration date
- November 9, 2005
- NPI status
- Active
- Practice phone
- (806) 641-6016
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. John Thomas Gregg practices at Amarillo South Texas Emergency Center in Amarillo, Texas
Dr. Gregg's primary practice is Amarillo South Texas Emergency Center, at 5800 S Coulter St, Amarillo, TX 79119 in Randall County. The practice phone is (806) 641-6016.
- Amarillo South Texas Emergency Center5800 S Coulter St, Amarillo, TX 79119 · Randall CountyPhone(806) 641-6016
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John Thomas Gregg is affiliated with 2 sites of care and 10 medical groups
Dr. Gregg's primary practice is Amarillo South Texas Emergency Center in Amarillo, Texas. The medical group on file is Concord Medical Group. Dmand AI also links Dr. Gregg to 9 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John Thomas Gregg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gregg practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Amarillo South Texas Emergency Center | Available with a free account |
| +1 more site and 9 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Thomas Gregg is one of 1,939 general surgeons in Texas
Surgery is Dr. Gregg's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Gregg's licenses on file in 2 states: Oklahoma and Texas.
Specialties and state licenses
- Surgery, OklahomaPrimary
- Texas license
General surgeons near Dr. Gregg
Counts of general 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. John Thomas Gregg billed Medicare for 182 services in 2024
CMS data shows 182 Medicare services from Dr. Gregg across 4 procedure codes in 2024, for 189 Medicare patients. Medicare paid $16,313 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Gregg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1362024: 16421%
- Tests and treatments
- 2023: 02024: 18
- Surgery
- 2023: 132024: 0100%
Dr. Gregg compared with the Texas median for general surgeons, 2024
- Dr. Gregg
- Texas median
- Medicare services
- 182vs 11854% above
- Medicare patients
- 189vs 9795% above
- Part D claims
- 11vs 4274% below
Medians across 1,674 general surgeons in Texas with Dmand AI profiles that report each measure.
Dr. Gregg's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gregg and other general surgeons in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Thomas Gregg treated 189 Medicare patients in 2024, average age 76
CMS counts 189 Medicare patients who saw Dr. Gregg in 2024. The largest group is 75 to 84, with 67 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 20% are also on Medicaid. Their average risk score is 1.46, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gregg's median patient age at 49, with 60% women.
Dr. Gregg's Medicare patients by age, 2024
Dr. Gregg's Medicare patients by sex, 2024
- Women11159%
- Men7841%
Chronic conditions among Dr. Gregg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Diabetes40%
- Ischemic heart disease37%
- Atrial fibrillation31%
- COPD29%
- Chronic kidney disease29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gregg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 49
Patient panel by sex, all payers
- Women60%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Thomas Gregg wrote 82 Medicare Part D claims in 2024
In 2024, Dr. Gregg wrote 82 Medicare Part D claims for 55 patients. 96% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $80 in total drug cost. In 2019, CMS named 12 claims across 1 drug.
Dr. Gregg's Part D claims by kind of drug, 2024
- Generic79 claims96%
- Brand-name and other3 claims4%
Dr. Gregg'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. Gregg's Part D claims, 2024
- Antibiotics44%36 of 82 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, 2019 to 2024
- 2019
- 2024
- Claims for drugs CMS names
- 2019: 122024: 118%
Drugs named by CMS: 1 in 2024, 1 in 2019.
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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Dr. John Thomas Gregg received $44 in industry payments from 2018 to 2025
CMS Open Payments shows 2 general payments to Dr. Gregg from 2 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 100% of the total. Vertex Pharmaceuticals Incorporated paid the most, $28.
General payments to Dr. Gregg by program year, 2018 to 2025
Companies that paid Dr. Gregg the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. John Thomas Gregg'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| 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. John Thomas Gregg
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. John Thomas Gregg's NPI number?
Dr. John Thomas Gregg's NPI number is 1184605917. It was assigned on November 9, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John Thomas Gregg?
Dr. John Thomas Gregg is a general surgeon in Amarillo, Texas. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. John Thomas Gregg practice?
Dr. Gregg practices at 5800 S Coulter St, Amarillo, TX 79119. Dr. Gregg's primary practice is Amarillo South Texas Emergency Center in Amarillo, Texas. Dmand AI also links Dr. Gregg to 9 medical groups and 1 group practice or clinic.
What is Dr. John Thomas Gregg's office phone number?
The practice phone on file for Dr. Gregg is (806) 641-6016.
What is Dr. John Thomas Gregg's medical license number?
Dr. Gregg holds Oklahoma license 17854, one of the licenses on file in 2 states.
Which states has Dr. John Thomas Gregg been licensed in?
Dmand AI has state licenses on file for Dr. Gregg in Oklahoma and Texas.
What medical group is Dr. John Thomas Gregg part of?
Dr. Gregg is linked to Concord Medical Group. Dmand AI links Dr. Gregg to 9 more medical groups.
Does Dr. John Thomas Gregg accept Medicare?
Yes. CMS data shows Dr. Gregg billed Medicare for 182 services in 2024.
How many Medicare patients does Dr. John Thomas Gregg see?
CMS counts 189 Medicare patients who saw Dr. Gregg in 2024, with an average age of 76.
What services does Dr. John Thomas Gregg bill to Medicare?
In 2024, Dr. Gregg's most billed Medicare services were emergency department visit (99284), emergency department visit (99285) and emergency department visit (99283).
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What drugs does Dr. John Thomas Gregg prescribe most?
In 2024 Medicare Part D data, Dr. Gregg's most prescribed drugs by claims were Azithromycin.
Has Dr. John Thomas Gregg received payments from drug or device companies?
CMS Open Payments shows $44 in general payments to Dr. Gregg from 2 companies from 2018 to 2025. The largest total came from Vertex Pharmaceuticals Incorporated.
How long has Dr. John Thomas Gregg been practicing?
Dr. Gregg graduated from medical school in 1980, 46 years ago.
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