Dr. Gregory Leroy Walker, MD
- Medicare services, 2024
- 430
- Medicare patients, 2024
- 60
- Part D claims, 2024
- 1,988
- Hospital affiliations
- 1
- Industry payments
- $18,788
- Practice address
- 4940 Eastern Avenue, Baltimore, MD 21224
- Practice phone
- Call (410) 550-0123
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Walker's professional email, personal email and mobile number
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Dr. Gregory Leroy Walker is an internist in Baltimore, Maryland
Dr. Walker practices at Johns Hopkins Bayview Medical Center in Baltimore, Maryland, part of Johns Hopkins Health System.
Dr. Walker's NPI, 1366508301, was assigned on December 27, 2006. Dr. Walker graduated from University of Maryland School of Medicine in 1978. Dr. Walker holds Maryland license D0025662.
- NPI
- 1366508301NPI Registry (opens in a new tab)
- NPI enumeration date
- December 27, 2006
- NPI status
- Active
- Practice phone
- (410) 550-0123
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gregory Leroy Walker practices at Johns Hopkins Bayview Medical Center in Baltimore, Maryland
Dr. Walker's primary practice is Johns Hopkins Bayview Medical Center, at 4940 Eastern Avenue, Baltimore, MD 21224 in Baltimore City. The practice phone is (410) 550-0123.
- Johns Hopkins Bayview Medical Center4940 Eastern Avenue, Baltimore, MD 21224 · Baltimore CityPhone(410) 550-0123
Source: Dmand AI Affiliation Data
Dr. Gregory Leroy Walker is affiliated with 2 sites of care
Dr. Walker's primary practice is Johns Hopkins Bayview Medical Center in Baltimore, Maryland, part of Johns Hopkins Health System. Dmand AI also links Dr. Walker to 1 physician office, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory Leroy Walker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walker practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Johns Hopkins Bayview Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory Leroy Walker is one of 3,320 internists in Maryland
Internal medicine is Dr. Walker's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Walker is licensed in Maryland.
Specialties and state licenses
- Internal medicine, MarylandPrimary
Internists near Dr. Walker
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. Gregory Leroy Walker billed Medicare for 430 services in 2024
CMS data shows 430 Medicare services from Dr. Walker across 8 procedure codes in 2024, for 60 Medicare patients. Medicare paid $33,938 for them. Every service was in an office.
Dr. Walker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2022024: 27737%
- Tests and treatments
- 2023: 02024: 121
- Other services
- 2023: 02024: 32
Dr. Walker compared with the Maryland median for internists, 2024
- Dr. Walker
- Maryland median
- Medicare services
- 430vs 65634% below
- Medicare patients
- 60vs 25176% below
- Part D claims
- 1,545vs 3095.0 times
Medians across 3,215 internists in Maryland with Dmand AI profiles that report each measure.
Dr. Walker'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Leroy Walker treated 60 Medicare patients in 2024, average age 73
CMS counts 60 Medicare patients who saw Dr. Walker in 2024. The largest group is 65 to 74, with 31 patients. 75% of them have high blood pressure, and 67% have high cholesterol. Their average risk score is 0.91, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walker's median patient age at 71, with 41% women.
Dr. Walker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Walker's Medicare patients by sex, 2024
- Women3050%
- Men3050%
Chronic conditions among Dr. Walker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol67%
- Diabetes55%
- Ischemic heart disease43%
- Arthritis38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Walker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women41%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Leroy Walker wrote 1,988 Medicare Part D claims in 2024
In 2024, Dr. Walker wrote 1,988 Medicare Part D claims for 105 patients. 83% of them were for generic drugs. CMS names the drug for 1,545 of them, across 62 drugs with 11 or more claims each, at $154,087 in total drug cost. In 2023, CMS named 1,728 claims across 58 drugs.
Dr. Walker's Part D claims by kind of drug, 2024
- Generic1,656 claims83%
- Brand-name318 claims16%
- Other14 claims1%
Dr. Walker'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. Walker's Part D claims, 2024
- Opioids13%260 of 1,988 claims
- Antibiotics6%119 of 1,988 claims
- Antipsychotics, patients 65 and over1%25 of 1,988 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: 1,7282024: 1,54511%
Drugs named by CMS: 62 in 2024, 58 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. Gregory Leroy Walker received $18,788 in industry payments from 2016 to 2025
CMS Open Payments shows 594 general payments to Dr. Walker from 59 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 95% of the total. AstraZeneca Pharmaceuticals LP paid the most, $2,541.
General payments to Dr. Walker by program year, 2016 to 2025
General payments to Dr. Walker by kind, 2016 to 2025
- Food and beverage$17,87095%
- Speaker and faculty fees$5303%
- Education$2691%
- Gifts$1201%
Companies that paid Dr. Walker 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. Gregory Leroy Walker graduated from University of Maryland School of Medicine
Dr. Walker graduated from University of Maryland School of Medicine in 1978.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Leroy Walker'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) |
| 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. Gregory Leroy Walker
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. Gregory Leroy Walker's NPI number?
Dr. Gregory Leroy Walker's NPI number is 1366508301. It was assigned on December 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Leroy Walker?
Dr. Gregory Leroy Walker is an internist in Baltimore, Maryland. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gregory Leroy Walker practice?
Dr. Walker practices at 4940 Eastern Avenue, Baltimore, MD 21224. Dr. Walker's primary practice is Johns Hopkins Bayview Medical Center in Baltimore, Maryland, part of Johns Hopkins Health System. Dmand AI also links Dr. Walker to 1 physician office.
What is Dr. Gregory Leroy Walker's office phone number?
The practice phone on file for Dr. Walker is (410) 550-0123.
What is Dr. Gregory Leroy Walker's medical license number?
Dr. Walker holds Maryland license D0025662.
Which hospitals is Dr. Gregory Leroy Walker affiliated with?
Dr. Walker practices at Johns Hopkins Bayview Medical Center in Baltimore, Maryland.
Does Dr. Gregory Leroy Walker accept Medicare?
Yes. CMS data shows Dr. Walker billed Medicare for 430 services in 2024.
How many Medicare patients does Dr. Gregory Leroy Walker see?
CMS counts 60 Medicare patients who saw Dr. Walker in 2024, with an average age of 73.
What services does Dr. Gregory Leroy Walker bill to Medicare?
In 2024, Dr. Walker's most billed Medicare services were office visit, established patient (99214), heart test or procedure (93000) and blood vessel study (93922).
Where did Dr. Gregory Leroy Walker go to medical school?
Dr. Walker graduated from University of Maryland School of Medicine in 1978.
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What drugs does Dr. Gregory Leroy Walker prescribe most?
In 2024 Medicare Part D data, Dr. Walker's most prescribed drugs by claims were Oxycodone HCl, Losartan Potassium and Atorvastatin Calcium.
Has Dr. Gregory Leroy Walker received payments from drug or device companies?
CMS Open Payments shows $18,788 in general payments to Dr. Walker from 59 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Gregory Leroy Walker been practicing?
Dr. Walker graduated from medical school in 1978, 48 years ago.
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