Diego Alfonso Valenzuela, MD
Nephrology Physician · Chicago, IL
Diego Alfonso Valenzuela, MD is a nephrology physician with a practice address in Chicago, Illinois, and NPI 1609526987, issued on Mar 28, 2022. Check the license (Illinois 036.175197, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Diego Alfonso Valenzuela
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License numbers
- 036.175197 IL
1609526987 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5841 S. Maryland Ave., Chicago, IL 60637
- Phone
- (773) 702-3630
- Enumerated
- Mar 28, 2022
- Record last updated
- Jun 2, 2025
- Fax
- (773) 753-8301
- 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 Diego Alfonso Valenzuela 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 036.175197Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average nephrology physician in 2024
150 Medicare Part D claims for 43 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
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.
Diego Alfonso Valenzuela among 572 nephrology physician records in Illinois
Diego Alfonso Valenzuela, MD 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 2022, is newer than 95% of them.
- NPI issued2022 · 95% of these records are older, 3% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileNo · 76% of these records are
- Record last updated2025 · 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
- Mary HammesChicago, IL 606371366505885
- Michelle JosephsonChicago, IL 606371184785917
- Benjamin Ko, M.D.Chicago, IL 606371619096583
Common questions
What is Diego Alfonso Valenzuela, MD's NPI number?
Diego Alfonso Valenzuela, MD's National Provider Identifier (NPI) is 1609526987, issued on Mar 28, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Diego Alfonso Valenzuela, MD located?
The NPPES record lists a practice address at 5841 S. Maryland Ave., Chicago, IL, 60637. Phone: (773) 702-3630. Providers update this record themselves, so call before visiting.
How can I verify Diego Alfonso Valenzuela, MD's license?
NPPES lists Illinois license number 036.175197, 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 Diego Alfonso Valenzuela, MD prescribe under Medicare Part D?
In 2024, Diego Alfonso Valenzuela, MD had 150 Medicare Part D claims for 43 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.