Gary Altwerger, M.D.
Gynecologic Oncology Physician · Chicago, IL
Gary Altwerger, M.D. is a gynecologic oncology physician with a practice address in Chicago, Illinois, and NPI 1407114630, issued on Apr 25, 2012. Check the license (Illinois 036176993, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Gary Altwerger
- Credential
- M.D.
- Primary taxonomy
- Gynecologic Oncology Physician 207VX0201X
- License number
- 036176993 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5841 S Maryland Ave, Chicago, IL 60637
- Phone
- (888) 824-0200
- Enumerated
- Apr 25, 2012
- Record last updated
- Jan 15, 2026
- Medicare enrollment
- Enrolled (PECOS I20251105003308); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gynecologic oncology physician records → All 76 in Illinois → Look up another NPI →
Also registered at 5841 S Maryland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gary Altwerger 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 036176993Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average gynecologic oncology physician in 2024
57 Medicare Part D claims for 25 beneficiaries, against an average of 195 among the 1,475 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of 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 practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,464.63
11 payments; by number, the most common kind was food and beverage; the largest payer was Intuitive Surgical, Inc. The 1,199 providers of this specialty with any payment received $6,387.20 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 3 group practices
- Ahp Specialty Care NfpHinsdale, IL
- University OF ChicagoChicago, IL
- Yale UniversityNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary Altwerger among 76 gynecologic oncology physician records in Illinois
Gary Altwerger, M.D. is one of 76 gynecologic oncology physician records with a practice address in Illinois. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 28% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2012 · median 2008 among the 52 with a school on file
- Record last updated2026 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VX0201X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gynecologic Oncology Physician providers in Illinois
There are 76 gynecologic oncology physician records in Illinois.
All 76 in Illinois → Every provider in Chicago → Gynecologic Oncology Physician nationwide →
The 8 gynecologic oncology physician records with the nearest ZIP codes
- Sarah Ackroyd, M.D, M.P.HChicago, IL 606371982053526
- Han CunChicago, IL 606371649666942
- Kelsey Goon, MDChicago, IL 606371073132643
- Kelsea Grant, MDChicago, IL 606371750030599
- Katherine KurnitChicago, IL 606371902194269
- Nita LeeChicago, IL 606371255374708
- Ernst Lengyel, MDChicago, IL 606371447296306
- Kathryn MillsChicago, IL 606371033471131
Common questions
What is Gary Altwerger, M.D.'s NPI number?
Gary Altwerger, M.D.'s National Provider Identifier (NPI) is 1407114630, issued on Apr 25, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Gary Altwerger, M.D. located?
The NPPES record lists a practice address at 5841 S Maryland Ave, Chicago, IL, 60637. Phone: (888) 824-0200. Providers update this record themselves, so call before visiting.
How can I verify Gary Altwerger, M.D.'s license?
NPPES lists Illinois license number 036176993, 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 Gary Altwerger, M.D. prescribe under Medicare Part D?
In 2024, Gary Altwerger, M.D. had 57 Medicare Part D claims for 25 beneficiaries; the average among gynecologic oncology physician prescribers was 195. Part D covers Medicare prescriptions only.
What is Gary Altwerger, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. 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.