John Ellis Williamson, D.O.
Emergency Medical Services (Emergency Medicine) Physician · Morris, IL
John Ellis Williamson, D.O. is an emergency medical services (emergency medicine) physician with a practice address in Morris, Illinois, and NPI 1629017108, issued on Jun 6, 2006. Check the license (Illinois 036-109152, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Ellis Williamson
- Credential
- D.O.
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License numbers
- 036-109152 IL
036109152 IL
Self-reported in NPPES; status is on the state search - Practice location
- 150 W High St, Morris, IL 60450
- Phone
- (815) 942-2932
- Enumerated
- Jun 6, 2006
- Record last updated
- Sep 27, 2023
- Medicaid ID
- 036109152-1 IL
- Medicare enrollment
- Enrolled (PECOS I20070713000171); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 117 in Illinois → Look up another NPI →
Also registered at 150 W High St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ashley BloughFamily Nurse Practitioner1770011397
- Kaleigh Burkert, RDNRegistered Dietitian1467374058
- Lorie ButlerRegistered Dietitian1407021272
Verify John Ellis Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-109152Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
242 Medicare Part D claims for 176 beneficiaries, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D. 44 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen39 claims
- Cephalexin24 claims
- Ondansetron Odt17 claims
- Methylprednisolone14 claims
- Amoxicillin-Clavulanate Potass12 claims
- Sulfamethoxazole-Trimethoprim11 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.
The MIPS final score for 2023 (Medicare payment program): 91.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
3 hospitals and group practices
- Sarah Bush Lincoln Health CenterMattoon, IL · Acute Care Hospitals3 of 5 stars
- Aurora Emergency Physicians LLCAurora, IL
- Epic Group-Emergency Physicians AN Illinois Concern SCMorris, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
John Ellis Williamson among 117 emergency medical services (emergency medicine) physician records in Illinois
John Ellis Williamson, D.O. is one of 117 emergency medical services (emergency medicine) physician records with a practice address in Illinois. 53% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 24% of them.
- NPI issued2006 · 24% of these records are older, 24% newer
- In a Medicare fileYes · 53% of these records are
- In the CMS Doctors and Clinicians fileYes · 37% of these records are
- Graduated1995 · median 1996 among the 42 with a school on file
- Record last updated2023 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medical Services (Emergency Medicine) Physician providers in Illinois
There are 117 emergency medical services (emergency medicine) physician records in Illinois.
All 117 in Illinois → Every provider in Morris → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Kimberly Mitchell, MDNew Lenox, IL 604511568425890
- Sean Motzny, M.D.Oak Lawn, IL 604531952467185
- Ravi Dodda, D.O.Olympia Fields, IL 604611124284724
- Neil Shah, D.O.Olympia Fields, IL 604611093074916
- Stephen Chester, D.O.Palos Heights, IL 604631093795924
- Claudine Feliciano, D.OJoliet, IL 604351770790032
- Mohammad Baig, M.D.Orland Park, IL 604671174506026
- Anthony Doukas, PARAMEDICJoliet, IL 604311245157684
Common questions
What is John Ellis Williamson, D.O.'s NPI number?
John Ellis Williamson, D.O.'s National Provider Identifier (NPI) is 1629017108, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Ellis Williamson, D.O. located?
The NPPES record lists a practice address at 150 W High St, Morris, IL, 60450. Phone: (815) 942-2932. Providers update this record themselves, so call before visiting.
How can I verify John Ellis Williamson, D.O.'s license?
NPPES lists Illinois license number 036-109152, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Ellis Williamson, D.O. prescribe under Medicare Part D?
In 2024, John Ellis Williamson, D.O. had 242 Medicare Part D claims for 176 beneficiaries; the average among emergency medical services (emergency medicine) physician prescribers was 292. Part D covers Medicare prescriptions only.
What is John Ellis Williamson, D.O.'s MIPS final score?
The 2023 MIPS final score is 91.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.