Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Don J Williams, MD

Individual provider Internal Medicine Physician · NPI 1447288287

Don J Williams, MD is an Internal Medicine in Oak Park, Illinois. Qualified in 1986, 40 years ago. Practices with Dynamic Physical Therapy, Inc, a 43-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
40
Licensed in
IL
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1100 Lake St Ste 230
Oak Park, IL 60301-1095
Phone: (331) 221-9001
Fax: (331) 221-2759
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036081395 (IL)

Record details

NPI number1447288287
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 29, 2006
Last updated in NPPESMay 19, 2022
Certification dateApril 27, 2021
Mailing address4201 Winfield Rd Fl 4, Warrenville, IL 60555-4025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1986 (40 years in practice)
Group practice Dynamic Physical Therapy, Inc. — 43 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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