Zachary Philip Lamaster, D.O.
Family Medicine Physician · Chicago, IL
Zachary Philip Lamaster, D.O. is a family medicine physician with a practice address in Chicago, Illinois, and NPI 1265667810, issued on May 27, 2009. Check the license (Illinois 036130431, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Zachary Philip Lamaster
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036130431 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4600 N Ravenswood Ave FL 2, Chicago, IL 60640
- Phone
- (773) 561-7500
- Enumerated
- May 27, 2009
- Record last updated
- Mar 20, 2025
- Fax
- (773) 561-7612
- Medicare enrollment
- Enrolled (PECOS I20130116000572); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 2009
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Also registered at 4600 N Ravenswood Ave FL 2
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Zachary Philip Lamaster 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 036130431Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average family medicine physician in 2024
783 Medicare Part D claims for 70 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 15 claims were for opioids.
Most prescribed
- Atorvastatin Calcium92 claims
- Lisinopril56 claims
- Metformin Hcl27 claims
- Lorazepam25 claims
- Descovy23 claims
- Gabapentin23 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
- Advocate Health And Hospitals CorporationBuffalo Grove, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zachary Philip Lamaster among 6,215 family medicine physician records in Illinois
Zachary Philip Lamaster, D.O. 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 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 43% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2009 · median 2006 among the 3,714 with a school on file
- Record last updated2025 · 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
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- Charles Crotteau, M.D.Chicago, IL 606401295757136
- Jose Elizondo, MDChicago, IL 606401912934985
- Anees Fatima, MDChicago, IL 606401154341709
- Richard Guthmann, MDChicago, IL 606401831112978
- My Mark, M.D.Chicago, IL 606401396772661
- James Mo, MDChicago, IL 606401962486571
Common questions
What is Zachary Philip Lamaster, D.O.'s NPI number?
Zachary Philip Lamaster, D.O.'s National Provider Identifier (NPI) is 1265667810, issued on May 27, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Zachary Philip Lamaster, D.O. located?
The NPPES record lists a practice address at 4600 N Ravenswood Ave FL 2, Chicago, IL, 60640. Phone: (773) 561-7500. Providers update this record themselves, so call before visiting.
How can I verify Zachary Philip Lamaster, D.O.'s license?
NPPES lists Illinois license number 036130431, 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 Zachary Philip Lamaster, D.O. prescribe under Medicare Part D?
In 2024, Zachary Philip Lamaster, D.O. had 783 Medicare Part D claims for 70 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.