Peter Paul Mayock, M.D.
Internal Medicine Physician · Chicago, IL
Peter Paul Mayock, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1285735142, issued on Sep 25, 2006. Check the license (Illinois 036084492, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Peter Paul Mayock
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036084492 IL
Self-reported in NPPES; status is on the state search - Practice location
- 845 W Wilson Ave, Chicago, IL 60640
- Phone
- (773) 506-4283
- Enumerated
- Sep 25, 2006
- Record last updated
- Feb 23, 2022
- Fax
- (773) 989-5986
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 845 W Wilson Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kristin Allen, FNP, RNFamily Nurse Practitioner1336656966
- Jane Anichini, APRNFamily Nurse Practitioner1679868996
- Meghan Baldwin, APNPsychiatric/Mental Health Nurse Practitioner1598172009
- Emily Berwald, APNFamily Health Clinical Nurse Specialist1851775977
- Young Cheon-Klessig, FNPFamily Nurse Practitioner1770619538
- Talia Eisenstein, MDFamily Medicine Physician1427552322
Verify Peter Paul Mayock 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 036084492Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,566 Medicare Part D claims for 128 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 25 claims were for opioids.
Most prescribed
- Atorvastatin Calcium273 claims
- Metformin Hcl162 claims
- Amlodipine Besylate117 claims
- Hydrochlorothiazide90 claims
- Jardiance89 claims
- Levothyroxine Sodium84 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.
Peter Paul Mayock among 7,238 internal medicine physician records in Illinois
Peter Paul Mayock, M.D. 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- 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
- Maher Al-Koubaytari, M.D.Chicago, IL 606401437124419
- Shehzad Ali, M.D.Chicago, IL 606401548233117
- Susan Alt, MDChicago, IL 606401255384277
- Emily Chatskis, MDChicago, IL 606401790771434
- Lorrie Elliott, M.D.Chicago, IL 606401265474191
- Aleksandra Ivanovic, MDChicago, IL 606401477546711
- Christopher Konstantelos, M.DChicago, IL 606401952330243
- Sean Le, M.D.Chicago, IL 606401578552915
Common questions
What is Peter Paul Mayock, M.D.'s NPI number?
Peter Paul Mayock, M.D.'s National Provider Identifier (NPI) is 1285735142, issued on Sep 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter Paul Mayock, M.D. located?
The NPPES record lists a practice address at 845 W Wilson Ave, Chicago, IL, 60640. Phone: (773) 506-4283. Providers update this record themselves, so call before visiting.
How can I verify Peter Paul Mayock, M.D.'s license?
NPPES lists Illinois license number 036084492, 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 Peter Paul Mayock, M.D. prescribe under Medicare Part D?
In 2024, Peter Paul Mayock, M.D. had 2,566 Medicare Part D claims for 128 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.