John James Walker, DSC, MPAS
- Medicare patients, 2024
- 170
- Part D claims, 2024
- 70
- Industry payments
- $41
- Affiliated sites
- 2
- Medical groups
- 3
- Practice address
- 1870 Amherst St Ste F Suite F, Winchester, VA 22601
- Practice phone
- Call (540) 536-0010
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Valley Intensivists - Winchester (1870 Amherst St)
Multi-specialty group site · Winchester, Virginia
Find John Walker'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.
John James Walker is a physician assistant in Leesburg, Virginia
John Walker practices at Valley Intensivists - Winchester (1870 Amherst St) in Winchester, Virginia.
John Walker's NPI, 1962502385, was assigned on September 25, 2006. John Walker holds Virginia license 0110005462.
- NPI
- 1962502385NPI Registry (opens in a new tab)
- NPI enumeration date
- September 25, 2006
- NPI status
- Active
- Practice phone
- (540) 536-0010
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
John James Walker practices in Winchester and Leesburg
John Walker's primary practice is Valley Intensivists - Winchester (1870 Amherst St), at 1870 Amherst St Ste F Suite F, Winchester, VA 22601. The practice phone is (540) 536-0010. The NPI Registry lists John Walker's practice address as 601 Potomac Station NE Dr, Leesburg, VA 20176.
- Valley Intensivists - Winchester (1870 Amherst St)Primary1870 Amherst St Ste F Suite F, Winchester, VA 22601Phone(540) 536-0010
- NPI Registry address601 Potomac Station NE Dr, Leesburg, VA 20176 · Loudoun County
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
John James Walker is affiliated with 2 sites of care and 3 medical groups
John Walker's primary practice is Valley Intensivists - Winchester (1870 Amherst St) in Winchester, Virginia. The medical group on file is Patient First. Dmand AI also links John Walker to 2 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at John James Walker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Walker practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Valley Intensivists - Winchester (1870 Amherst St) | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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John James Walker is one of 3,636 physician assistants in Virginia
Physician assistant is John Walker's primary specialty in the NPI Registry, under taxonomy code 363A00000X. John Walker is licensed in Virginia.
Specialties and state licenses
- Physician assistant, VirginiaPrimary
Physician assistants near John Walker
Counts of physician assistants 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
John James Walker treated 170 Medicare patients in 2024, average age 78
CMS counts 170 Medicare patients who saw John Walker in 2024. The largest group is 75 to 84, with 70 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 12% are also on Medicaid. Their average risk score is 1.55, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts John Walker's median patient age at 15, with 100% women.
John Walker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
John Walker's Medicare patients by sex, 2024
- Women11769%
- Men5331%
Chronic conditions among John Walker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis56%
- Anxiety41%
- Mood disorders39%
- Depression38%
- Chronic kidney disease35%
- Osteoporosis30%
Share of Medicare patients with each condition. A patient can have several.
John 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 15
Patient panel by sex, all payers
- Women100%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John James Walker wrote 70 Medicare Part D claims in 2024
In 2024, John Walker wrote 70 Medicare Part D claims for 43 patients. 97% of them were for generic drugs.
John Walker's Part D claims by kind of drug, 2024
- Generic68 claims97%
- Brand-name and other2 claims3%
Drug classes CMS tracks in John Walker's Part D claims, 2024
- Opioids43%30 of 70 claims
- Antibiotics16%11 of 70 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
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John James Walker received $41 in industry payments in 2025
CMS Open Payments shows 1 general payment to John Walker from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $41.
Companies that paid John Walker the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for John James 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 John James 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 John James Walker's NPI number?
John James Walker's NPI number is 1962502385. It was assigned on September 25, 2006, and it is active in the NPI Registry.
What does John James Walker specialize in?
John James Walker is a physician assistant in Leesburg, Virginia. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does John James Walker practice?
John Walker practices at 1870 Amherst St Ste F Suite F, Winchester, VA 22601. John Walker also practices at 601 Potomac Station NE Dr, Leesburg, VA 20176. John Walker's primary practice is Valley Intensivists - Winchester (1870 Amherst St) in Winchester, Virginia. Dmand AI also links John Walker to 2 medical groups and 1 group practice or clinic.
What is John James Walker's office phone number?
The practice phone on file for John Walker is (540) 536-0010.
What is John James Walker's medical license number?
John Walker holds Virginia license 0110005462.
What medical group is John James Walker part of?
John Walker is linked to Patient First. Dmand AI links John Walker to 2 more medical groups.
How many Medicare patients does John James Walker see?
CMS counts 170 Medicare patients who saw John Walker in 2024, with an average age of 78.
Has John James Walker received payments from drug or device companies?
CMS Open Payments shows $41 in general payments to John Walker from 1 company from 2025 to 2025. The largest total came from Boston Scientific Corporation.
How long has John James Walker been practicing?
John Walker graduated from medical school in 2004, 22 years ago.
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