Dennis Alan Peacock, MD
Internal Medicine Physician · Chicago, IL
Dennis Alan Peacock, MD is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1023223021, issued on May 11, 2007. Check the license (Illinois 036.141382, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Dennis Alan Peacock
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 036.141382 IL
200700 LA
Self-reported in NPPES; status is on the state search - Practice location
- 1333 W Belmont Ave Ste 100, Chicago, IL 60657
- Phone
- (312) 694-2273
- Enumerated
- May 11, 2007
- Record last updated
- May 27, 2022
- Fax
- (312) 694-1875
- Medicaid IDs
- 05024018 MS
1073849 LA - Medicare enrollment
- Enrolled (PECOS I20170206001786); accepts Medicare assignment
- Medical or professional school
- University Of Tennessee, Hsc, College Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 1333 W Belmont Ave Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amanda Carlo, NPNurse Practitioner1376947929
- Jessica Hoffstein, PAPhysician Assistant1790247849
- Shena Mohan, PA-CPhysician Assistant1912333675
- Pooja PatelPhysician Assistant1225701675
- Brenda Ruiz, MSN, FNP-BCNurse Practitioner1003374182
Verify Dennis Alan Peacock 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 036.141382Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
165 Medicare Part D claims for 131 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin18 claims
- Azithromycin16 claims
- Amoxicillin-Clavulanate Potass15 claims
- Mupirocin14 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.
One hospital affiliation
- Loyola University Medical CenterMaywood, IL · Acute Care Hospitals2 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Dennis Alan Peacock among 7,238 internal medicine physician records in Illinois
Dennis Alan Peacock, MD is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 55% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2004 · median 2003 among the 3,580 with a school on file
- Record last updated2022 · 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 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Bruce Blacker, M.D.Chicago, IL 606571982603924
- Brian Boholst, M.D.Chicago, IL 606571235181959
- Edgar Borda, MDChicago, IL 606571891782447
- Harold EulienChicago, IL 606571700877222
- Lisa Greising, M.D.Chicago, IL 606571578523155
- Michael Grendon, M.D.Chicago, IL 606571922007962
- Catherine Kallal, MDChicago, IL 606571407801665
- Alam Khan, M.D.Chicago, IL 606571316946288
Common questions
What is Dennis Alan Peacock, MD's NPI number?
Dennis Alan Peacock, MD's National Provider Identifier (NPI) is 1023223021, issued on May 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Dennis Alan Peacock, MD located?
The NPPES record lists a practice address at 1333 W Belmont Ave Ste 100, Chicago, IL, 60657. Phone: (312) 694-2273. Providers update this record themselves, so call before visiting.
How can I verify Dennis Alan Peacock, MD's license?
NPPES lists Illinois license number 036.141382, 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 Dennis Alan Peacock, MD prescribe under Medicare Part D?
In 2024, Dennis Alan Peacock, MD had 165 Medicare Part D claims for 131 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.
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.