Zackary Thomas Franzen, MD
Internal Medicine Physician · Rockford, IL
Zackary Thomas Franzen, MD is an internal medicine physician with a practice address in Rockford, Illinois, and NPI 1851851018, issued on Mar 23, 2019. Check the license (Illinois 036160276, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Zackary Thomas Franzen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036160276 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5666 E State St, Rockford, IL 61108
- Phone
- (815) 226-2000
- Enumerated
- Mar 23, 2019
- Record last updated
- Jul 28, 2022
- Medicare enrollment
- Enrolled (PECOS I20220824001371); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 5666 E State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Zackary Thomas Franzen 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 036160276Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
294 Medicare Part D claims for 124 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass25 claims
- Prednisone18 claims
- Albuterol Sulfate Hfa12 claims
- Furosemide12 claims
- Metoprolol Tartrate11 claims
- Spironolactone11 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
- Osf Multi-Specialty GroupRockford, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zackary Thomas Franzen among 7,238 internal medicine physician records in Illinois
Zackary Thomas Franzen, MD 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 2019, is newer than 68% of them.
- NPI issued2019 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2019 · median 2003 among the 3,580 with a school on file
- Record last updated2022 · 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).
82 internal medicine physician records list a practice address in Rockford
They are 82 of the 3,893 NPPES records with a practice address in Rockford, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Rockford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joyce Cheng, MDRockford, IL 611081407310733
- Srinivas Gullapalli, M.D.Rockford, IL 611081932356763
- Jennis Iruke, MDRockford, IL 611081558538041
- Binoy Kamal, M.D.Rockford, IL 611081295805174
- Robert Larson, DORockford, IL 611081902546963
- Rajyalaxmi Mullapudi, M.D.Rockford, IL 611081013953546
- Dileep Kumar Reddy RegallaRockford, IL 611081194379867
- Christine Simaytis, M.D.Rockford, IL 611081629176060
Common questions
What is Zackary Thomas Franzen, MD's NPI number?
Zackary Thomas Franzen, MD's National Provider Identifier (NPI) is 1851851018, issued on Mar 23, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Zackary Thomas Franzen, MD located?
The NPPES record lists a practice address at 5666 E State St, Rockford, IL, 61108. Phone: (815) 226-2000. Providers update this record themselves, so call before visiting.
How can I verify Zackary Thomas Franzen, MD's license?
NPPES lists Illinois license number 036160276, 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 Zackary Thomas Franzen, MD prescribe under Medicare Part D?
In 2024, Zackary Thomas Franzen, MD had 294 Medicare Part D claims for 124 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.