Mark H. Gregory, MD
Internal Medicine Physician · Saint Louis, MO
Mark H. Gregory, MD is an internal medicine physician with a practice address in Saint Louis, Missouri, and NPI 1104843663, issued on Jul 17, 2006. Check the license (Missouri 100578, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Mark H. Gregory
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 100578 MO
Self-reported in NPPES; status is on the state search - Practice location
- 555 N New Ballas RD, Saint Louis, MO 63141
- Phone
- (314) 872-8470
- Enumerated
- Jul 17, 2006
- Record last updated
- Jul 9, 2026
- Fax
- (314) 872-8472
- Medicaid ID
- 920674500 MO
- Medicare enrollment
- Enrolled (PECOS I20040918000191); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 1986
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 555 N New Ballas RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark H. Gregory in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 100578Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% more Medicare Part D claims than the average internal medicine physician in 2024
5,376 Medicare Part D claims for 302 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 149 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium365 claims
- Omeprazole187 claims
- Levothyroxine Sodium173 claims
- Amlodipine Besylate165 claims
- Hydrochlorothiazide154 claims
- Atorvastatin Calcium152 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 78.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,083.02
45 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark H. Gregory among 2,604 internal medicine physician records in Missouri
Mark H. Gregory, MD is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated1986 · median 2006 among the 1,443 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
941 internal medicine physician records list a practice address in Saint Louis
They are 941 of the 27,605 NPPES records with a practice address in Saint Louis, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Saint Louis → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Carolyn Koenig, MDSaint Louis, MO 631411063488278
- Bernard McGuire, M.D.Saint Louis, MO 631411942274030
- Angela Miller, M.D.Saint Louis, MO 631411184605883
- C Molden, MDSaint Louis, MO 631411720086747
- Margaret Murphy, M.D.Saint Louis, MO 631411043285745
Common questions
What is Mark H. Gregory, MD's NPI number?
Mark H. Gregory, MD's National Provider Identifier (NPI) is 1104843663, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark H. Gregory, MD located?
The NPPES record lists a practice address at 555 N New Ballas RD, Saint Louis, MO, 63141. Phone: (314) 872-8470. Providers update this record themselves, so call before visiting.
How can I verify Mark H. Gregory, MD's license?
NPPES lists Missouri license number 100578, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark H. Gregory, MD prescribe under Medicare Part D?
In 2024, Mark H. Gregory, MD had 5,376 Medicare Part D claims for 302 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mark H. Gregory, MD's MIPS final score?
The 2023 MIPS final score is 78.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.