Justin Macmillan, DO
Internal Medicine Physician · Elgin, IL
Justin Macmillan, DO is an internal medicine physician with a practice address in Elgin, Illinois, and NPI 1467080994, issued on Mar 30, 2020. Check the license (Illinois 036.162688, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Justin Macmillan
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 036.162688 IL
125.076402 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1425 N Randall RD # 2-1200, Elgin, IL 60123
- Phone
- (224) 783-2525
- Enumerated
- Mar 30, 2020
- Record last updated
- Sep 8, 2023
- Fax
- (224) 783-2527
- Medicare enrollment
- Enrolled (PECOS I20230705001290); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 2020
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 1425 N Randall RD # 2-1200
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Natalie Pagoria, M.D.Family Medicine Physician1629331871
Verify Justin Macmillan 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 036.162688Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
88 Medicare Part D claims for 47 beneficiaries, against an average of 3,176 among the 108,855 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.
Bills Medicare through one group practice
- Advocate Health And Hospitals CorporationElgin, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin Macmillan among 7,238 internal medicine physician records in Illinois
Justin Macmillan, DO is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 71% of them.
- NPI issued2020 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2020 · median 2003 among the 3,580 with a school on file
- Record last updated2023 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
62 internal medicine physician records list a practice address in Elgin
They are 62 of the 2,268 NPPES records with a practice address in Elgin, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Elgin → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard Baley, M.D.Elgin, IL 601231184693327
- Jawed Ehsan, MDElgin, IL 601231114901501
- John Fiedler, M.D.Elgin, IL 601231487623716
- Dennis Flynn, M.D.Elgin, IL 601231295704435
- Jeffrey Garb, M.D.Elgin, IL 601231023063237
- Anandita Gephart, M.D.Elgin, IL 601231790709343
- Michael Hernandez, M.D.Elgin, IL 601231972501096
- Ronald Hirsch, M.D.Elgin, IL 601231467450585
Common questions
What is Justin Macmillan, DO's NPI number?
Justin Macmillan, DO's National Provider Identifier (NPI) is 1467080994, issued on Mar 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Justin Macmillan, DO located?
The NPPES record lists a practice address at 1425 N Randall RD # 2-1200, Elgin, IL, 60123. Phone: (224) 783-2525. Providers update this record themselves, so call before visiting.
How can I verify Justin Macmillan, DO's license?
NPPES lists Illinois license number 036.162688, 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 Justin Macmillan, DO prescribe under Medicare Part D?
In 2024, Justin Macmillan, DO had 88 Medicare Part D claims for 47 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.