William L. Peterson, M.D.
Gastroenterology Physician · Springfield, IL
William L. Peterson, M.D. is a gastroenterology physician with a practice address in Springfield, Illinois, and NPI 1174623854, issued on Sep 23, 2006. Check the license (Illinois 036-082538, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- William L. Peterson
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 036-082538 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1025 S 6TH St, Springfield, IL 62703
- Phone
- (217) 528-7541
- Enumerated
- Sep 23, 2006
- Record last updated
- May 21, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (217) 788-5830
- Medicare enrollment
- Enrolled (PECOS I20041207000108); accepts Medicare assignment
- Medical or professional school
- University Of North Dakota School Of Medicine, 1981
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 1025 S 6TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jeffrey Adkins, CRNACertified Registered Nurse Anesthetist1992793954
- Deborah Albright, M.D.Internal Medicine Physician1639145360
- Stanley Allen, M.D.Internal Medicine Physician1285631127
- Jessica Alwerdt, PHYSICIAN ASSISTANTPhysician Assistant1669706057
Verify William L. Peterson 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 036-082538Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.5 times the Medicare Part D claims of the average gastroenterology physician in 2024
4,457 Medicare Part D claims for 874 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 27 claims were for opioids.
Most prescribed
- Pantoprazole Sodium929 claims
- Famotidine620 claims
- Omeprazole335 claims
- Mesalamine226 claims
- Dicyclomine Hcl181 claims
- Diphenoxylate-Atropine156 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).
Industry payments in 2024: $1,439.42
49 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Springfield Clinic, LLPSpringfield, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William L. Peterson among 887 gastroenterology physician records in Illinois
William L. Peterson, M.D. is one of 887 gastroenterology physician records with a practice address in Illinois. 85% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 52% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1981 · median 2003 among the 643 with a school on file
- Record last updated2020 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Springfield → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Fadi Annaba, MD.Springfield, IL 627031154353217
- Sailaja Cheruku, M.D.Springfield, IL 627031578659496
- Ashish Chopra, M.D.Springfield, IL 627031497727234
- Ruchi Gupta, M.D.Springfield, IL 627031558413302
- Mark Harrison, M.D.Springfield, IL 627031831295666
- Peter Karras, M.D.Springfield, IL 627031114025566
- Rajan Kochar, MDSpringfield, IL 627031851503692
- Robert Mosley, M.D.Springfield, IL 627031770683443
Common questions
What is William L. Peterson, M.D.'s NPI number?
William L. Peterson, M.D.'s National Provider Identifier (NPI) is 1174623854, issued on Sep 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William L. Peterson, M.D. located?
The NPPES record lists a practice address at 1025 S 6TH St, Springfield, IL, 62703. Phone: (217) 528-7541. Providers update this record themselves, so call before visiting.
How can I verify William L. Peterson, M.D.'s license?
NPPES lists Illinois license number 036-082538, 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 William L. Peterson, M.D. prescribe under Medicare Part D?
In 2024, William L. Peterson, M.D. had 4,457 Medicare Part D claims for 874 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is William L. Peterson, M.D.'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.