Mary Hammes
Nephrology Physician · Chicago, IL
Mary Hammes is a nephrology physician with a practice address in Chicago, Illinois, and NPI 1366505885, issued on Dec 18, 2006. Check the license (Illinois 036081803, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mary Hammes
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 036081803 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
- Dec 18, 2006
- Record last updated
- Oct 24, 2022
- Medicare enrollment
- Enrolled (PECOS I20101027001408); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 572 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 Mary Hammes 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 036081803Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average nephrology physician in 2024
260 Medicare Part D claims for 47 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Amlodipine Besylate25 claims
- Hydralazine Hcl15 claims
- Nifedipine Er13 claims
- Prednisone13 claims
- Sulfamethoxazole-Trimethoprim13 claims
- Carvedilol12 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): 97.7 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).
2 hospitals and group practices
- The University OF Chicago Medical CenterChicago, IL · Acute Care Hospitals4 of 5 stars
- University OF ChicagoChicago, IL
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.
Mary Hammes among 572 nephrology physician records in Illinois
Mary Hammes is one of 572 nephrology physician records with a practice address in Illinois. 87% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1988 · median 2002 among the 433 with a school on file
- Record last updated2022 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Illinois
There are 572 nephrology physician records in Illinois.
All 572 in Illinois → Every provider in Chicago → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Arlene ChapmanChicago, IL 606371982614921
- Ling-Xin Chen, M.D.Chicago, IL 606371962633438
- Fredric CoeChicago, IL 606371609938158
- Beatrice Concepcion, M.D.Chicago, IL 606371518143551
- Patrick CunninghamChicago, IL 606371518033315
- Michelle JosephsonChicago, IL 606371184785917
- Benjamin Ko, M.D.Chicago, IL 606371619096583
- Jay Koyner, M.D.Chicago, IL 606371275656340
Common questions
What is Mary Hammes's NPI number?
Mary Hammes's National Provider Identifier (NPI) is 1366505885, issued on Dec 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Hammes 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 Mary Hammes's license?
NPPES lists Illinois license number 036081803, 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 Mary Hammes prescribe under Medicare Part D?
In 2024, Mary Hammes had 260 Medicare Part D claims for 47 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
What is Mary Hammes's MIPS final score?
The 2023 MIPS final score is 97.7 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.