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

Dr. Janssen Jacob Williams, MD

Individual provider Internal Medicine Physician · NPI 1568548790

Dr. Janssen Jacob Williams, MD is an Internal Medicine in McDonough, Georgia. Graduated from University of Nebraska College of Medicine in 1990, 36 years ago. Accepts Medicare assignment. Licensed in Georgia, Indiana and Nebraska.

Years since qualifying
36
Trained at
University of Nebraska College of Medicine
Licensed in
GA, IN, NE
In the registry since
2006
Specialties on file
3
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

4303 Jodeco Rd
McDonough, GA 30253-8297
Phone: (618) 546-5464
Fax: (618) 546-2648
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 075176 (GA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 19536 (NE)
Internal Medicine Physician Taxonomy 207R00000X · Licence 01076261A (IN)

Record details

NPI number1568548790
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 31, 2006
Last updated in NPPESMarch 26, 2025
Certification dateMarch 26, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF NEBRASKA COLLEGE OF MEDICINE
Graduated 1990 (36 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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