David Smith Oyer, M.D.
Endocrinology, Diabetes & Metabolism Physician · Chicago, IL
David Smith Oyer, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Chicago, Illinois, and NPI 1134226467, issued on Sep 20, 2006. Check the license (Illinois 036050957, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- David Smith Oyer
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 036050957 IL
Self-reported in NPPES; status is on the state search - Practice location
- 211 E Chicago Ave Ste 1700, Chicago, IL 60611
- Phone
- (312) 944-6677
- Enumerated
- Sep 20, 2006
- Record last updated
- Mar 27, 2026
- Fax
- (312) 944-3346
- Medicaid ID
- 036050957 IL
- Medicare enrollment
- Enrolled (PECOS I20101228000505); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 1969
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 436 in Illinois → Look up another NPI →
Also registered at 211 E Chicago Ave Ste 1700
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sean Oconnor, M.D.Internal Medicine Physician1609831528
- Eric Terman, M.D.Internal Medicine Physician1699783977
Verify David Smith Oyer 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 036050957Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
6,152 Medicare Part D claims for 304 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 92 claims were for opioids.
Most prescribed
- Levothyroxine Sodium327 claims
- Atorvastatin Calcium291 claims
- Rosuvastatin Calcium266 claims
- Ozempic231 claims
- Metoprolol Succinate225 claims
- Ezetimibe191 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.
Industry payments in 2024: $886.20
31 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 5,661 providers of this specialty with any payment received $5,742.15 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.
David Smith Oyer among 436 endocrinology, diabetes & metabolism physician records in Illinois
David Smith Oyer, M.D. is one of 436 endocrinology, diabetes & metabolism 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 5% of them.
- NPI issued2006 · 5% of these records are older, 62% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1969 · median 2006 among the 295 with a school on file
- Record last updated2026 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Illinois
There are 436 endocrinology, diabetes & metabolism physician records in Illinois.
All 436 in Illinois → Every provider in Chicago → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Grazia Aleppo, MDChicago, IL 606111689603268
- Grant Barish, M.D.Chicago, IL 606111265526073
- Joseph Bass, MD, PHDChicago, IL 606111700810017
- Gerhard Bauman, MDChicago, IL 606111457326910
- Mary Gillam, MDChicago, IL 606111588695084
- Allison Hahr, M.D.Chicago, IL 606111083774889
- Peter Kopp, M.D.Chicago, IL 606111598827842
- William Lowe, M.D.Chicago, IL 606111093879652
Common questions
What is David Smith Oyer, M.D.'s NPI number?
David Smith Oyer, M.D.'s National Provider Identifier (NPI) is 1134226467, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David Smith Oyer, M.D. located?
The NPPES record lists a practice address at 211 E Chicago Ave Ste 1700, Chicago, IL, 60611. Phone: (312) 944-6677. Providers update this record themselves, so call before visiting.
How can I verify David Smith Oyer, M.D.'s license?
NPPES lists Illinois license number 036050957, 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 David Smith Oyer, M.D. prescribe under Medicare Part D?
In 2024, David Smith Oyer, M.D. had 6,152 Medicare Part D claims for 304 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.