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Dr. Mark E. Gregory, MD
NPI1659346963
- Medicare services, 2024
- 621
- Medicare patients, 2024
- 494
- Part D claims, 2024
- 214
- Publications
- 2
- Hospital affiliations
- 1
- Practice address
- 600 South Monroe, Enid, OK 73701
- Practice phone
- Call (580) 233-2300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Gregory'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. Mark E. Gregory is an emergency medicine physician in Enid, Oklahoma
Dr. Gregory practices at INTEGRIS Health Enid Hospital in Enid, Oklahoma, part of INTEGRIS Health.
Dr. Gregory's NPI, 1659346963, was assigned on February 21, 2006. Dr. Gregory holds Oklahoma license 16492.
NPI and contact details
- NPI
- 1659346963NPI Registry (opens in a new tab)
- NPI enumeration date
- February 21, 2006
- NPI status
- Active
- Practice phone
- (580) 233-2300
- 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. Mark E. Gregory practices at INTEGRIS Health Enid Hospital in Enid, Oklahoma
Dr. Gregory's primary practice is INTEGRIS Health Enid Hospital, at 600 South Monroe, Enid, OK 73701 in Garfield County. The practice phone is (580) 233-2300.
- INTEGRIS Health Enid Hospital600 South Monroe, Enid, OK 73701 · Garfield CountyPhone(580) 233-2300
Source: Dmand AI Affiliation Data
Dr. Mark E. Gregory is affiliated with 1 site of care and 2 medical groups
Dr. Gregory's primary practice is INTEGRIS Health Enid Hospital in Enid, Oklahoma, part of INTEGRIS Health. The medical group on file is Emergency Services Of Oklahoma, PC. Dmand AI also links Dr. Gregory to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark E. Gregory's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gregory practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| INTEGRIS Health Enid Hospital | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark E. Gregory is one of 695 emergency medicine physicians in Oklahoma
Emergency medicine is Dr. Gregory's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Gregory is licensed in Oklahoma.
Specialties and state licenses
- Emergency medicine, OklahomaPrimary
Emergency medicine physicians near Dr. Gregory
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
695emergency medicine physicians in Oklahoma10emergency medicine physicians in Enid6emergency medicine physicians at INTEGRIS Health Enid Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark E. Gregory billed Medicare for 621 services in 2024
CMS data shows 621 Medicare services from Dr. Gregory across 5 procedure codes in 2024, for 494 Medicare patients. Medicare paid $54,568 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024621
Medicare patients494
Paid by Medicare$54,568
Procedure codes5
Dr. Gregory's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4742024: 53713%
- Tests and treatments
- 2023: 02024: 84
Dr. Gregory compared with the Oklahoma median for emergency medicine physicians, 2024
- Dr. Gregory
- Oklahoma median
- Medicare services
- 621vs 32492% above
- Medicare patients
- 494vs 29468% above
- Part D claims
- 54vs 8839% below
Medians across 669 emergency medicine physicians in Oklahoma with Dmand AI profiles that report each measure.
Dr. Gregory'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.
Need commercial claims for Dr. Gregory?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gregory and other emergency medicine physicians in Oklahoma.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark E. Gregory treated 494 Medicare patients in 2024, average age 75
CMS counts 494 Medicare patients who saw Dr. Gregory in 2024. The largest group is 75 to 84, with 176 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 18% are also on Medicaid. Their average risk score is 1.58, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Gregory's median patient age at 43, with 54% women.
Medicare patients, 2024494
Average age75
Average risk score1.58
Also on Medicaid18%
Dr. Gregory's Medicare patients by age, 2024
Dr. Gregory's Medicare patients by sex, 2024
- Women28959%
- Men20541%
Chronic conditions among Dr. Gregory's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis56%
- Ischemic heart disease46%
- Diabetes38%
- Anxiety35%
- Chronic kidney disease34%
- Mood disorders34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gregory's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 43
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark E. Gregory wrote 214 Medicare Part D claims in 2024
In 2024, Dr. Gregory wrote 214 Medicare Part D claims for 167 patients. 95% of them were for generic drugs. CMS names the drug for 54 of them, across 3 drugs with 11 or more claims each, at $347 in total drug cost. In 2023, CMS named 41 claims across 3 drugs.
Part D claims, 2024214
Drugs named by CMS3
Total drug cost$347
Part D patients167
Dr. Gregory's Part D claims by kind of drug, 2024
- Generic203 claims95%
- Brand-name11 claims5%
Dr. Gregory'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. Gregory's Part D claims, 2024
- Opioids15%32 of 214 claims
- Antibiotics30%65 of 214 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: 412024: 5432%
Drugs named by CMS: 3 in 2024, 3 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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Dr. Mark E. Gregory has 2 publications on record
Dmand AI links 2 papers to Dr. Gregory, published from 2013 to 2025. Dr. Gregory's most frequent co-authors are Kathryn C. Haran, DO, Wilson Joe Liao, MD and Haley Naik, MD.
Papers2
Years published2013 to 2025
Dr. Gregory's most frequent co-authors
Recent publications by Dr. Gregory
Intensive Care UnitsInterleukin-2 Receptor alpha SubunitLithostathine
See who Dr. Gregory researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gregory works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark E. Gregory received $107 in industry payments from 2016 to 2022
CMS Open Payments shows 7 general payments to Dr. Gregory from 3 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $60.
General payments to Dr. Gregory by program year, 2016 to 2022
Companies that paid Dr. Gregory the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark E. Gregory'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 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Mark E. Gregory
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. Mark E. Gregory's NPI number?
Dr. Mark E. Gregory's NPI number is 1659346963. It was assigned on February 21, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark E. Gregory?
Dr. Mark E. Gregory is an emergency medicine physician in Enid, Oklahoma. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Mark E. Gregory practice?
Dr. Gregory practices at 600 South Monroe, Enid, OK 73701. Dr. Gregory's primary practice is INTEGRIS Health Enid Hospital in Enid, Oklahoma, part of INTEGRIS Health. Dmand AI also links Dr. Gregory to 1 medical group.
What is Dr. Mark E. Gregory's office phone number?
The practice phone on file for Dr. Gregory is (580) 233-2300.
What is Dr. Mark E. Gregory's medical license number?
Dr. Gregory holds Oklahoma license 16492.
Which hospitals is Dr. Mark E. Gregory affiliated with?
Dr. Gregory practices at INTEGRIS Health Enid Hospital in Enid, Oklahoma.
What medical group is Dr. Mark E. Gregory part of?
Dr. Gregory is linked to Emergency Services Of Oklahoma, PC. Dmand AI links Dr. Gregory to 1 more medical group.
Does Dr. Mark E. Gregory accept Medicare?
Yes. CMS data shows Dr. Gregory billed Medicare for 621 services in 2024.
How many Medicare patients does Dr. Mark E. Gregory see?
CMS counts 494 Medicare patients who saw Dr. Gregory in 2024, with an average age of 75.
What services does Dr. Mark E. Gregory bill to Medicare?
In 2024, Dr. Gregory's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and heart test or procedure (93010).
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What drugs does Dr. Mark E. Gregory prescribe most?
In 2024 Medicare Part D data, Dr. Gregory's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Cephalexin and Ondansetron ODT.
Has Dr. Mark E. Gregory received payments from drug or device companies?
CMS Open Payments shows $107 in general payments to Dr. Gregory from 3 companies from 2016 to 2022. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Mark E. Gregory been practicing?
Dr. Gregory's NPI was assigned in 2006.
Does Dr. Mark E. Gregory do research?
Dmand AI links 2 publications to Dr. Gregory, published from 2013 to 2025.
Who does Dr. Mark E. Gregory publish with?
Dr. Gregory's most frequent co-authors are Kathryn C. Haran, DO (1 shared paper), Wilson Joe Liao, MD (1 shared paper) and Haley Naik, MD (1 shared paper).
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