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

Dr. William L. Peterson, MD

Individual provider Gastroenterology Physician · NPI 1174623854

Dr. William L. Peterson, MD is a Gastroenterology in Springfield, Illinois. Graduated from University of North Dakota School of Medicine in 1981, 45 years ago. Practices with Springfield Clinic, LLP, a 679-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
45
Trained at
University of North Dakota School of Medicine
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

1025 S 6th St
Springfield, IL 62703-2403
Phone: (217) 528-7541
Fax: (217) 788-5830
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 036-082538 (IL)

Record details

NPI number1174623854
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 23, 2006
Last updated in NPPESMay 21, 2020
Certification dateMay 21, 2020

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF NORTH DAKOTA SCHOOL OF MEDICINE
Graduated 1981 (45 years in practice)
Group practice Springfield Clinic, Llp — 679 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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