NPPES file of Aug 9, 2026

Andrew Riggan Williams, M.D.

Emergency Medicine Physician · Oak Park, IL

Andrew Riggan Williams, M.D. is an emergency medicine physician with a practice address in Oak Park, Illinois, and NPI 1275988156, issued on Apr 28, 2016. Check the license (Illinois 036158129, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1275988156
Name
Andrew Riggan Williams
Credential
M.D.
Primary taxonomy
Emergency Medicine Physician 207P00000X
License number
036158129 IL
Self-reported in NPPES; status is on the state search
Practice location
3 Erie CT, Oak Park, IL 60302
Phone
(708) 763-6747
Enumerated
Apr 28, 2016
Record last updated
Mar 19, 2024
Medicare enrollment
Enrolled (PECOS I20251023003917); accepts Medicare assignment
Medical or professional school
University Of Michigan Medical School, 2016
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest emergency medicine physician records → All 3,291 in Illinois → Look up another NPI →

Also registered at 3 Erie CT

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jennifer Acevedo, MS CCC-SLP/LSpeech-Language Pathologist1164680419
  2. Joshua Ajjarapu, M.D.Hospitalist Physician1841501699
  3. Mark Arnett, M.D.Diagnostic Radiology Physician1538114616
  4. Heidi Asbury, M.D.Anatomic Pathology & Clinical Pathology Physician1043247372
  5. Avram Avramov, M.D.Anesthesiology Physician1194769216
  6. Gina Biasiello, D.P.TPhysical Therapist1124490610

Verify Andrew Riggan Williams in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036158129    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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53% fewer Medicare Part D claims than the average emergency medicine physician in 2024

106 Medicare Part D claims for 66 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 15 claims were for opioids.

  1. Andrew Williams106
  2. Specialty average226

Most prescribed

  1. Ibuprofen17 claims
  2. Hydrocodone-Acetaminophen15 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.

Industry payments in 2024: $22.83

1 payment: food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Andrew Williams$22.83
  2. Specialty average$953.79

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through 4 group practices

  1. Humboldt Park Health Emergency Medicine LLCChicago, IL
  2. Illinois Emergency Medicine Specialists LLCChicago, IL
  3. Mercy Health System CorporationJanesville, WI
  4. Rockford Health PhysiciansRockford, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Andrew Riggan Williams among 3,291 emergency medicine physician records in Illinois

Andrew Riggan Williams, M.D. is one of 3,291 emergency medicine physician records with a practice address in Illinois. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 65% of them.

  • NPI issued2016 · 65% of these records are older, 32% newer
  • In a Medicare fileYes · 80% of these records are
  • In the CMS Doctors and Clinicians fileYes · 57% of these records are
  • Graduated2016 · median 2012 among the 1,867 with a school on file
  • Record last updated2024 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

28 emergency medicine physician records list a practice address in Oak Park

They are 28 of the 2,307 NPPES records with a practice address in Oak Park, and 3,291 emergency medicine physician records in Illinois.

All 3,291 in Illinois → Every provider in Oak Park → Emergency Medicine Physician nationwide →

The 8 emergency medicine physician records with the nearest ZIP codes

  1. Logesh DharmarOak Park, IL 603021568858611
  2. Paula Green, M.D.Oak Park, IL 603021609876077
  3. Nathan Ledeaux, MDOak Park, IL 603021306201363
  4. John Lund, M.D.Oak Park, IL 603021578977500
  5. Bruce Mac Kenzie, M.D.Oak Park, IL 603021720185507
  6. Jagdish Muzumdar, M.D., FACEPOak Park, IL 603021467477703
  7. Anthony Nuval, MDOak Park, IL 603021508251109
  8. Maryam Ojulari, MDOak Park, IL 603021457091456

Common questions

What is Andrew Riggan Williams, M.D.'s NPI number?

Andrew Riggan Williams, M.D.'s National Provider Identifier (NPI) is 1275988156, issued on Apr 28, 2016. An NPI identifies a provider in billing; it is not a license.

Where is Andrew Riggan Williams, M.D. located?

The NPPES record lists a practice address at 3 Erie CT, Oak Park, IL, 60302. Phone: (708) 763-6747. Providers update this record themselves, so call before visiting.

How can I verify Andrew Riggan Williams, M.D.'s license?

NPPES lists Illinois license number 036158129, 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 Andrew Riggan Williams, M.D. prescribe under Medicare Part D?

In 2024, Andrew Riggan Williams, M.D. had 106 Medicare Part D claims for 66 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.