Caitlin Elizabeth Polley Lassus, M.D.
Family Medicine Physician · Chicago, IL
Caitlin Elizabeth Polley Lassus, M.D. is a family medicine physician with a practice address in Chicago, Illinois, and NPI 1891007696, issued on Jul 8, 2010. Check the license (Illinois 036135716, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Caitlin Elizabeth Polley Lassus
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036135716 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4747 N Kedzie Ave, 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)
- Medicare enrollment
- Enrolled (PECOS I20140915001947); accepts Medicare assignment
- Medical or professional school
- Perelman School Of Med At The University Of Pennsylvania, 2010
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Also registered at 4747 N Kedzie Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sherie Ajayi, NPNurse Practitioner1184290025
- Elaine ColdrenPediatrics Physician1407245939
- Wesley GibbertFamily Medicine Physician1255862157
- Karen Haverkamp, MDPediatrics Physician1134223761
- Nilusha Jayasinghe, FNP-BCFamily Nurse Practitioner1245806470
- Jemima King, LCPCProfessional Counselor1316284888
Verify Caitlin Elizabeth Polley 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 036135716Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average family medicine physician in 2024
715 Medicare Part D claims for 55 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Atorvastatin Calcium61 claims
- Metformin Hcl40 claims
- Amlodipine Besylate28 claims
- Fluticasone Propionate27 claims
- Levothyroxine Sodium26 claims
- Trulicity24 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.
Bills Medicare through one group practice
- Erie Family Health Center, IncChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Caitlin Elizabeth Polley Lassus among 6,215 family medicine physician records in Illinois
Caitlin Elizabeth Polley Lassus, M.D. 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 fileYes · 60% of these records are
- Graduated2010 · median 2006 among the 3,714 with a school on file
- 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 Caitlin Elizabeth Polley Lassus, M.D.'s NPI number?
Caitlin Elizabeth Polley Lassus, M.D.'s National Provider Identifier (NPI) is 1891007696, issued on Jul 8, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Caitlin Elizabeth Polley Lassus, M.D. located?
The NPPES record lists a practice address at 4747 N Kedzie Ave, Chicago, IL, 60625. Phone: (312) 666-3494. Providers update this record themselves, so call before visiting.
How can I verify Caitlin Elizabeth Polley Lassus, M.D.'s license?
NPPES lists Illinois license number 036135716, 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 Caitlin Elizabeth Polley Lassus, M.D. prescribe under Medicare Part D?
In 2024, Caitlin Elizabeth Polley Lassus, M.D. had 715 Medicare Part D claims for 55 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.