Dr. Peter C. Gregg, MD
- Medicare services, 2024
- 585
- Medicare patients, 2024
- 147
- Part D claims, 2024
- 3,291
- Hospital affiliations
- 1
- Industry payments
- $1,201
- Practice address
- 301 International Cir, Cockeysville, MD 21030
- Practice phone
- Call (410) 433-2200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Jai Medical Center
Cockeysville, Maryland
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. Peter C. Gregg is an internist in Cockeysville, Maryland
Dr. Gregg practices at Jai Medical Center in Cockeysville, Maryland.
Dr. Gregg's NPI, 1558564294, was assigned on June 8, 2007. Dr. Gregg graduated from Johns Hopkins University School of Medicine in 2007. Dr. Gregg holds Maryland license D0070580.
- NPI
- 1558564294NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507040615
- NPI enumeration date
- June 8, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (410) 433-2200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Peter C. Gregg practices at Jai Medical Center in Cockeysville, Maryland
Dr. Gregg's primary practice is Jai Medical Center, at 301 International Cir, Cockeysville, MD 21030 in Baltimore County. The practice phone is (410) 433-2200.
- Jai Medical Center301 International Cir, Cockeysville, MD 21030 · Baltimore CountyPhone(410) 433-2200
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Peter C. Gregg is affiliated with 4 sites of care and 1 medical group
Dr. Gregg's primary practice is Jai Medical Center in Cockeysville, Maryland. Dr. Gregg is also affiliated with The Johns Hopkins Hospital. The medical group on file is JAI Medical Center. Dmand AI also links Dr. Gregg to 1 more group practice or clinic and 1 home health agency, 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. Peter C. Gregg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gregg practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Jai Medical Center | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Peter C. Gregg is one of 3,320 internists in Maryland
Internal medicine is Dr. Gregg's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gregg is licensed in Maryland.
Specialties and state licenses
- Internal medicine, MarylandPrimary
Internists near Dr. Gregg
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. Peter C. Gregg billed Medicare for 585 services in 2024
CMS data shows 585 Medicare services from Dr. Gregg across 10 procedure codes in 2024, for 147 Medicare patients. Medicare paid $43,700 for them. Every service was in an office.
Dr. Gregg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3492024: 3383%
- Tests and treatments
- 2023: 1102024: 1073%
- Other services
- 2023: 02024: 71
- Surgery
- 2023: 672024: 693%
Dr. Gregg compared with the Maryland median for internists, 2024
- Dr. Gregg
- Maryland median
- Medicare services
- 585vs 65611% below
- Medicare patients
- 147vs 25141% below
- Part D claims
- 2,805vs 3099.1 times
Medians across 3,215 internists in Maryland 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.
Need commercial claims for Dr. Gregg?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gregg and other internists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Peter C. Gregg treated 147 Medicare patients in 2024, average age 66
CMS counts 147 Medicare patients who saw Dr. Gregg in 2024. The largest group is 65 to 74, with 89 patients. 75% of them have high blood pressure, and 67% have high cholesterol. 87% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gregg's median patient age at 56, with 58% women.
Dr. Gregg's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Gregg's Medicare patients by sex, 2024
- Women8558%
- Men6242%
Chronic conditions among Dr. Gregg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol67%
- Arthritis56%
- Diabetes41%
- Tobacco use37%
- COPD35%
- Alcohol and drug use disorders30%
- 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 56
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Peter C. Gregg wrote 3,291 Medicare Part D claims in 2024
In 2024, Dr. Gregg wrote 3,291 Medicare Part D claims for 135 patients. 83% of them were for generic drugs. CMS names the drug for 2,805 of them, across 80 drugs with 11 or more claims each, at $221,149 in total drug cost. In 2023, CMS named 2,526 claims across 63 drugs.
Dr. Gregg's Part D claims by kind of drug, 2024
- Generic2,744 claims83%
- Brand-name509 claims15%
- Other38 claims1%
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
- Opioids4%137 of 3,291 claims
- Antibiotics3%84 of 3,291 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: 2,5262024: 2,80511%
Drugs named by CMS: 80 in 2024, 63 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
How Dr. Peter C. Gregg takes part in Medicare
Dr. Gregg accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Peter C. Gregg received $1,201 in industry payments from 2016 to 2025
CMS Open Payments shows 57 general payments to Dr. Gregg from 14 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Gilead Sciences, Inc. paid the most, $487.
General payments to Dr. Gregg by program year, 2016 to 2025
General payments to Dr. Gregg by kind, 2016 to 2025
- Food and beverage$1,19199%
- Education$111%
Companies that paid Dr. Gregg 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. Peter C. Gregg graduated from Johns Hopkins University School of Medicine
Dr. Gregg graduated from Johns Hopkins University School of Medicine in 2007.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Peter C. 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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. Peter C. 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. Peter C. Gregg's NPI number?
Dr. Peter C. Gregg's NPI number is 1558564294. It was assigned on June 8, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Peter C. Gregg?
Dr. Peter C. Gregg is an internist in Cockeysville, Maryland. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Peter C. Gregg practice?
Dr. Gregg practices at 301 International Cir, Cockeysville, MD 21030. Dr. Gregg's primary practice is Jai Medical Center in Cockeysville, Maryland. Dmand AI also links Dr. Gregg to 1 group practice or clinic and 1 home health agency.
What is Dr. Peter C. Gregg's office phone number?
The practice phone on file for Dr. Gregg is (410) 433-2200.
What is Dr. Peter C. Gregg's medical license number?
Dr. Gregg holds Maryland license D0070580.
Which hospitals is Dr. Peter C. Gregg affiliated with?
Dr. Gregg is affiliated with The Johns Hopkins Hospital.
What medical group is Dr. Peter C. Gregg part of?
Dr. Gregg is linked to JAI Medical Center.
Does Dr. Peter C. Gregg accept Medicare?
Yes. CMS data shows Dr. Gregg billed Medicare for 585 services in 2024, and Dr. Gregg accepts Medicare assignment.
How many Medicare patients does Dr. Peter C. Gregg see?
CMS counts 147 Medicare patients who saw Dr. Gregg in 2024, with an average age of 66.
What services does Dr. Peter C. Gregg bill to Medicare?
In 2024, Dr. Gregg's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and surgery: heart and blood vessels (36415).
Show 4 more questionsShow fewer questions
Where did Dr. Peter C. Gregg go to medical school?
Dr. Gregg graduated from Johns Hopkins University School of Medicine in 2007.
What drugs does Dr. Peter C. Gregg prescribe most?
In 2024 Medicare Part D data, Dr. Gregg's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
Has Dr. Peter C. Gregg received payments from drug or device companies?
CMS Open Payments shows $1,201 in general payments to Dr. Gregg from 14 companies from 2016 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Peter C. Gregg been practicing?
Dr. Gregg graduated from medical school in 2007, 19 years ago.
Selling to internal medicine practices?
See internists in Maryland by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card