Dr. Mark H. Gregory, MD
- Medicare services, 2024
- 2,696
- Medicare patients, 2024
- 250
- Part D claims, 2024
- 5,376
- MIPS score, 2024
- 86
- Hospital affiliations
- 6
- Practice address
- 555 N New Ballas Rd, Saint Louis, MO 63141
- Practice phone
- Call (314) 872-8470
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mark H Gregory MD
Saint Louis, Missouri
Find Dr. Gregory's professional email, personal email and mobile number
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Dr. Mark H. Gregory is an internist in Saint Louis, Missouri
Dr. Gregory practices at Mark H Gregory MD in Saint Louis, Missouri.
Dr. Gregory's NPI, 1104843663, was assigned on July 17, 2006. Dr. Gregory graduated from University of Vermont College of Medicine in 1986. Dr. Gregory holds Missouri license 100578.
- NPI
- 1104843663NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9234107111
- NPI enumeration date
- July 17, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (314) 872-8470
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark H. Gregory practices at Mark H Gregory MD in Saint Louis, Missouri
Dr. Gregory's primary practice is Mark H Gregory MD, at 555 N New Ballas Rd, Saint Louis, MO 63141 in Saint Louis County. The practice phone is (314) 872-8470.
- Mark H Gregory MD555 N New Ballas Rd, Saint Louis, MO 63141 · Saint Louis CountyPhone(314) 872-8470
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark H. Gregory is affiliated with 10 sites of care and 1 medical group
Dr. Gregory's primary practice is Mark H Gregory MD in Saint Louis, Missouri. Dr. Gregory is also affiliated with Barnes-Jewish Hospital. Dmand AI also links Dr. Gregory to 5 more hospitals, 1 physician office, 1 group practice or clinic, 1 home health agency and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark H. Gregory's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gregory practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mark H Gregory MD | Available with a free account |
| +9 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark H. Gregory is one of 2,114 internists in Missouri
Internal medicine is Dr. Gregory's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gregory is licensed in Missouri.
Specialties and state licenses
- Internal medicine, MissouriPrimary
Internists near Dr. Gregory
Counts of internists 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. Mark H. Gregory billed Medicare for 2,696 services in 2024
CMS data shows 2,696 Medicare services from Dr. Gregory across 17 procedure codes in 2024, for 250 Medicare patients. Medicare paid $131,922 for them. Every service was in an office.
Dr. Gregory's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 8082024: 8353%
- Office and hospital visits
- 2023: 7412024: 6828%
- Surgery
- 2023: 4732024: 472No change
- Tests and treatments
- 2023: 3122024: 43840%
- Lab and pathology
- 2023: 2302024: 26917%
Dr. Gregory compared with the Missouri median for internists, 2024
- Dr. Gregory
- Missouri median
- Medicare services
- 2,696vs 5305.1 times
- Medicare patients
- 250vs 21118% above
- Part D claims
- 4,759vs 32514.6 times
Medians across 2,076 internists in Missouri 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gregory and other internists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark H. Gregory treated 250 Medicare patients in 2024, average age 77
CMS counts 250 Medicare patients who saw Dr. Gregory in 2024. The largest group is 75 to 84, with 115 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 0.96, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gregory's median patient age at 76, with 44% women.
Dr. Gregory's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Gregory's Medicare patients by sex, 2024
- Women11446%
- Men13654%
Chronic conditions among Dr. Gregory's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis42%
- Ischemic heart disease36%
- Cancer22%
- Diabetes19%
- Atrial fibrillation18%
- Anxiety15%
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 76
Patient panel by sex, all payers
- Women44%
- Men56%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark H. Gregory wrote 5,376 Medicare Part D claims in 2024
In 2024, Dr. Gregory wrote 5,376 Medicare Part D claims for 302 patients. 87% of them were for generic drugs. CMS names the drug for 4,759 of them, across 98 drugs with 11 or more claims each, at $466,011 in total drug cost. In 2023, CMS named 4,576 claims across 94 drugs.
Dr. Gregory's Part D claims by kind of drug, 2024
- Generic4,651 claims87%
- Brand-name and other725 claims13%
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
- Opioids3%149 of 5,376 claims
- Antibiotics4%237 of 5,376 claims
- Antipsychotics, patients 65 and over0%18 of 5,376 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: 4,5762024: 4,7594%
Drugs named by CMS: 98 in 2024, 94 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
Dr. Mark H. Gregory scored 86 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 86 out of 100 for Dr. Gregory for performance year 2024, reported individually. Dr. Gregory accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gregory as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Gregory's MIPS scores, performance year 2024
- 86of 100Final score
- 89.1of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 63of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mark H. Gregory received $11,311 in industry payments from 2016 to 2025
CMS Open Payments shows 525 general payments to Dr. Gregory from 38 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 83% of the total. Boston Scientific Corporation paid the most, $2,609.
General payments to Dr. Gregory by program year, 2016 to 2025
General payments to Dr. Gregory by kind, 2016 to 2025
- Food and beverage$9,39083%
- Travel and lodging$1,87017%
- Education$510%
Companies that paid Dr. Gregory the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark H. Gregory graduated from University of Vermont College of Medicine
Dr. Gregory graduated from University of Vermont College of Medicine in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark H. 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 | 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 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (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 Dr. Mark H. 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 H. Gregory's NPI number?
Dr. Mark H. Gregory's NPI number is 1104843663. It was assigned on July 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark H. Gregory?
Dr. Mark H. Gregory is an internist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark H. Gregory practice?
Dr. Gregory practices at 555 N New Ballas Rd, Saint Louis, MO 63141. Dr. Gregory's primary practice is Mark H Gregory MD in Saint Louis, Missouri. Dmand AI also links Dr. Gregory to 5 hospitals, 1 physician office, 1 group practice or clinic, 1 home health agency and 1 medical group.
What is Dr. Mark H. Gregory's office phone number?
The practice phone on file for Dr. Gregory is (314) 872-8470.
What is Dr. Mark H. Gregory's medical license number?
Dr. Gregory holds Missouri license 100578.
Which hospitals is Dr. Mark H. Gregory affiliated with?
Dr. Gregory is affiliated with Barnes-Jewish Hospital. Dmand AI links Dr. Gregory to 5 more hospitals.
Does Dr. Mark H. Gregory accept Medicare?
Yes. CMS data shows Dr. Gregory billed Medicare for 2,696 services in 2024, and Dr. Gregory accepts Medicare assignment.
Does Dr. Mark H. Gregory offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Gregory as offering telehealth services.
What is Dr. Mark H. Gregory's MIPS score?
Dr. Gregory's MIPS final score for performance year 2024 is 86 out of 100, reported individually.
How many Medicare patients does Dr. Mark H. Gregory see?
CMS counts 250 Medicare patients who saw Dr. Gregory in 2024, with an average age of 77.
Show 5 more questionsShow fewer questions
What services does Dr. Mark H. Gregory bill to Medicare?
In 2024, Dr. Gregory's most billed Medicare services were surgery: heart and blood vessels (36415), office visit, established patient (99214) and lab and pathology test (81003).
Where did Dr. Mark H. Gregory go to medical school?
Dr. Gregory graduated from University of Vermont College of Medicine in 1986.
What drugs does Dr. Mark H. Gregory prescribe most?
In 2024 Medicare Part D data, Dr. Gregory's most prescribed drugs by claims were Rosuvastatin Calcium, Omeprazole and Levothyroxine Sodium.
Has Dr. Mark H. Gregory received payments from drug or device companies?
CMS Open Payments shows $11,311 in general payments to Dr. Gregory from 38 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Mark H. Gregory been practicing?
Dr. Gregory graduated from medical school in 1986, 40 years ago.
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