John Jeffrey Williamson, PA
- Medicare patients, 2024
- 256
- Part D claims, 2024
- 139
- Hospital affiliations
- 2
- Industry payments
- $92
- Medical groups
- 3
- Practice address
- 5114 N Glen Park Pl, Peoria, IL 61614
- Practice phone
- Call (309) 683-5050
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
OSF Multi-Specialty Group
Peoria, Illinois
Find John Williamson'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 Jeffrey Williamson is a physician assistant in Peoria, Illinois
John Williamson practices at OSF Multi-Specialty Group in Peoria, Illinois.
John Williamson's NPI, 1245338896, was assigned on September 20, 2006. John Williamson holds Illinois license 85001294.
- NPI
- 1245338896NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7315091295
- NPI enumeration date
- September 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (309) 683-5050
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
John Jeffrey Williamson practices at OSF Multi-Specialty Group in Peoria, Illinois
John Williamson's primary practice is OSF Multi-Specialty Group, at 5114 N Glen Park Pl, Peoria, IL 61614 in Peoria County. The practice phone is (309) 683-5050.
- OSF Multi-Specialty Group5114 N Glen Park Pl, Peoria, IL 61614 · Peoria CountyPhone(309) 683-5050
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John Jeffrey Williamson is affiliated with 4 sites of care and 3 medical groups
John Williamson's primary practice is OSF Multi-Specialty Group in Peoria, Illinois. John Williamson is also affiliated with OSF St. Joseph Medical Center. The medical group on file is OSF Multi-Specialty Group. Dmand AI also links John Williamson to 1 more hospital, 2 medical groups and 1 group practice or clinic, 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 John Jeffrey Williamson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Williamson practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| OSF Multi-Specialty Group | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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John Jeffrey Williamson is one of 4,299 physician assistants in Illinois
Physician assistant is John Williamson's primary specialty in the NPI Registry, under taxonomy code 363A00000X. John Williamson is licensed in Illinois.
Specialties and state licenses
- Physician assistant, IllinoisPrimary
Physician assistants near John Williamson
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 Jeffrey Williamson treated 256 Medicare patients in 2024, average age 74
CMS counts 256 Medicare patients who saw John Williamson in 2024. The largest group is 65 to 74, with 140 patients. 73% of them have high cholesterol, and 72% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.22, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Williamson's median patient age at 68, with 65% women.
John Williamson's Medicare patients by age, 2024
John Williamson's Medicare patients by sex, 2024
- Women15761%
- Men9939%
Chronic conditions among John Williamson's Medicare patients, 2024
- High cholesterol73%
- High blood pressure72%
- Arthritis70%
- Diabetes29%
- Anxiety25%
- Ischemic heart disease22%
- Mood disorders22%
- Chronic kidney disease21%
Share of Medicare patients with each condition. A patient can have several.
John Williamson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women65%
- Men35%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John Jeffrey Williamson wrote 139 Medicare Part D claims in 2024
In 2024, John Williamson wrote 139 Medicare Part D claims for 81 patients. 99% of them were for generic drugs.
John Williamson's Part D claims by kind of drug, 2024
- Generic138 claims99%
- Brand-name and other1 claims1%
Drug classes CMS tracks in John Williamson's Part D claims, 2024
- Opioids44%61 of 139 claims
- Antibiotics15%21 of 139 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
How John Jeffrey Williamson takes part in Medicare
John Williamson 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)
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John Jeffrey Williamson received $92 in industry payments in 2025
CMS Open Payments shows 2 general payments to John Williamson from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $92.
Companies that paid John Williamson 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 Jeffrey Williamson'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 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) |
| 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) |
| 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 Jeffrey Williamson
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 Jeffrey Williamson's NPI number?
John Jeffrey Williamson's NPI number is 1245338896. It was assigned on September 20, 2006, and it is active in the NPI Registry.
What does John Jeffrey Williamson specialize in?
John Jeffrey Williamson is a physician assistant in Peoria, Illinois. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does John Jeffrey Williamson practice?
John Williamson practices at 5114 N Glen Park Pl, Peoria, IL 61614. John Williamson's primary practice is OSF Multi-Specialty Group in Peoria, Illinois. Dmand AI also links John Williamson to 1 hospital, 2 medical groups and 1 group practice or clinic.
What is John Jeffrey Williamson's office phone number?
The practice phone on file for John Williamson is (309) 683-5050.
What is John Jeffrey Williamson's medical license number?
John Williamson holds Illinois license 85001294.
Which hospitals is John Jeffrey Williamson affiliated with?
John Williamson is affiliated with OSF St. Joseph Medical Center. Dmand AI links John Williamson to 1 more hospital.
What medical group is John Jeffrey Williamson part of?
John Williamson is linked to OSF Multi-Specialty Group. Dmand AI links John Williamson to 2 more medical groups.
Does John Jeffrey Williamson accept Medicare?
Yes. CMS lists John Williamson as accepting Medicare assignment.
How many Medicare patients does John Jeffrey Williamson see?
CMS counts 256 Medicare patients who saw John Williamson in 2024, with an average age of 74.
Has John Jeffrey Williamson received payments from drug or device companies?
CMS Open Payments shows $92 in general payments to John Williamson from 1 company from 2025 to 2025. The largest total came from Stryker Corporation.
How long has John Jeffrey Williamson been practicing?
John Williamson graduated from medical school in 1999, 27 years ago.
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