Peter C. Gregg, MD
Internal Medicine Physician · Baltimore, MD
Peter C. Gregg, MD is an internal medicine physician with a practice address in Baltimore, Maryland, and NPI 1558564294, issued on Jun 8, 2007. Check the license (Maryland D0070580, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Peter C. Gregg
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- D0070580 MD
Self-reported in NPPES; status is on the state search - Practice location
- 1235 E Monument St, Baltimore, MD 21202
- Phone
- (410) 327-5100
- Enumerated
- Jun 8, 2007
- Record last updated
- Jun 18, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (410) 327-8373
- Medicare enrollment
- Enrolled (PECOS I20110414000615); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 1235 E Monument St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashley Hibshman, CPNP-PCPediatric Nurse Practitioner1225429681
- Grace Huynh, CRNPPrimary Care Nurse Practitioner1891585410
- Kavitha Konduru, MDNeonatal-Perinatal Medicine Physician1285837237
- Desiree Koski, CRNP, FNP-C, FNP-BCFamily Nurse Practitioner1215686035
- Krystal Lester, MDPediatrics Physician1124169909
- Nathan Scott, M.D.Internal Medicine Physician1013932441
Verify Peter C. Gregg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0070580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% more Medicare Part D claims than the average internal medicine physician in 2024
3,291 Medicare Part D claims for 135 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 137 claims were for opioids.
Most prescribed
- Atorvastatin Calcium201 claims
- Amlodipine Besylate143 claims
- Lisinopril122 claims
- Gabapentin93 claims
- Nifedipine Er78 claims
- Pantoprazole Sodium74 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.
Industry payments in 2024: $186.03
7 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Bills Medicare through one group practice
- Hollis Seunarine Mdpa LLCBaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter C. Gregg among 3,904 internal medicine physician records in Maryland
Peter C. Gregg, MD is one of 3,904 internal medicine physician records with a practice address in Maryland. 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 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 44% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2007 · median 2003 among the 2,445 with a school on file
- Record last updated2014 · 59% 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 Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,278 internal medicine physician records list a practice address in Baltimore
They are 1,278 of the 35,183 NPPES records with a practice address in Baltimore, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Baltimore → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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Common questions
What is Peter C. Gregg, MD's NPI number?
Peter C. Gregg, MD's National Provider Identifier (NPI) is 1558564294, issued on Jun 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Peter C. Gregg, MD located?
The NPPES record lists a practice address at 1235 E Monument St, Baltimore, MD, 21202. Phone: (410) 327-5100. Providers update this record themselves, so call before visiting.
How can I verify Peter C. Gregg, MD's license?
NPPES lists Maryland license number D0070580, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Peter C. Gregg, MD prescribe under Medicare Part D?
In 2024, Peter C. Gregg, MD had 3,291 Medicare Part D claims for 135 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.