Donald Benjamin Lassus, MD
Family Medicine Physician · Chicago, IL
Donald Benjamin Lassus, MD is a family medicine physician with a practice address in Chicago, Illinois, and NPI 1124330055, issued on Jul 8, 2010. Check the license (Illinois 036135721, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Donald Benjamin Lassus
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036135721 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4747 N. Kedzie Avenue, Chicago, IL 60625
- Phone
- (312) 666-3494
- Enumerated
- Jul 8, 2010
- Record last updated
- Aug 10, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (773) 267-2175
- Medicaid ID
- 036135721 IL
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Verify Donald Benjamin Lassus 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 036135721Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average family medicine physician in 2024
805 Medicare Part D claims for 60 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims. 26 claims were for opioids.
Most prescribed
- Atorvastatin Calcium75 claims
- Metformin Hcl38 claims
- Jardiance33 claims
- Amlodipine Besylate28 claims
- Gabapentin28 claims
- Invokana23 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.
Donald Benjamin Lassus among 6,215 family medicine physician records in Illinois
Donald Benjamin Lassus, MD is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 57% of them.
- NPI issued2010 · 57% of these records are older, 41% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2021 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,593 family medicine physician records list a practice address in Chicago
They are 1,593 of the 63,379 NPPES records with a practice address in Chicago, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Chicago → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Stanislaw Bryjak, M.D.Chicago, IL 606251932159126
- Jose Castellanos, MDChicago, IL 606251750302386
- Mandy Gittler, MDChicago, IL 606251811929474
- Shaheen Humayun, MDChicago, IL 606251073539417
- Krister Johansson, MDChicago, IL 606251831136027
- Kate Lynn Maxouris, M.D.Chicago, IL 606251215986062
- Ann McDermott, D.O.Chicago, IL 606251437109204
- Chung Mok, MDChicago, IL 606251497757306
Common questions
What is Donald Benjamin Lassus, MD's NPI number?
Donald Benjamin Lassus, MD's National Provider Identifier (NPI) is 1124330055, issued on Jul 8, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Donald Benjamin Lassus, MD located?
The NPPES record lists a practice address at 4747 N. Kedzie Avenue, Chicago, IL, 60625. Phone: (312) 666-3494. Providers update this record themselves, so call before visiting.
How can I verify Donald Benjamin Lassus, MD's license?
NPPES lists Illinois license number 036135721, 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 Donald Benjamin Lassus, MD prescribe under Medicare Part D?
In 2024, Donald Benjamin Lassus, MD had 805 Medicare Part D claims for 60 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.