Zachary S. Fuller, DO
Internal Medicine Physician · Mason City, IA
Zachary S. Fuller, DO is an internal medicine physician with a practice address in Mason City, Iowa, and NPI 1770272031, issued on May 3, 2023. Check the license (Iowa DO-06810, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Zachary S. Fuller
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- DO-06810 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1010 4TH St SW, Mason City, IA 50401
- Phone
- (641) 428-5700
- Enumerated
- May 3, 2023
- Record last updated
- Oct 31, 2025
- Fax
- (641) 428-2515
- Medicare enrollment
- Enrolled (PECOS I20241218002427); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 871 in Iowa → Look up another NPI →
Also registered at 1010 4TH St SW
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amber Alberts, MDStudent in an Organized Health Care Education/Training Program1215671516
- Ignatius Alden, MDStudent in an Organized Health Care Education/Training Program1285323535
- Luan Bargman, PAPhysician Assistant1073525010
- Nancy Beavers, ARNPObstetrics & Gynecology Nurse Practitioner1447275540
- David Beck, MDNeurological Surgery Physician1710099809
- Timothy Becker, RPHPharmacist1477563955
Verify Zachary S. Fuller in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license DO-06810Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average internal medicine physician in 2024
326 Medicare Part D claims for 106 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium19 claims
- Losartan Potassium16 claims
- Furosemide14 claims
- Eliquis12 claims
- Metformin Hcl12 claims
- Prednisone11 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
- Cogent Healthcare OF Iowa PCMason City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zachary S. Fuller among 871 internal medicine physician records in Iowa
Zachary S. Fuller, DO is one of 871 internal medicine physician records with a practice address in Iowa. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 78% of them.
- NPI issued2023 · 78% of these records are older, 17% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 44% of these records are
- Graduated2023 · median 2008 among the 386 with a school on file
- Record last updated2025 · 46% 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 Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
36 internal medicine physician records list a practice address in Mason City
They are 36 of the 866 NPPES records with a practice address in Mason City, and 871 internal medicine physician records in Iowa.
All 871 in Iowa → Every provider in Mason City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Phillip Alscher, MDMason City, IA 504011700993888
- Vaughan Cipperly, MDMason City, IA 504011942235429
- Patrick Dunlay, DOMason City, IA 504011811004294
- Melissa Frame, MDMason City, IA 504011881796712
- Bruce Harlan, MDMason City, IA 504011336256593
- Mark Johnson, MDMason City, IA 504011013923127
- Janice Kirsch, MDMason City, IA 504011992809636
- Ali Mardan, PHD, MD, RPVI, FACPMason City, IA 504011619905353
Common questions
What is Zachary S. Fuller, DO's NPI number?
Zachary S. Fuller, DO's National Provider Identifier (NPI) is 1770272031, issued on May 3, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Zachary S. Fuller, DO located?
The NPPES record lists a practice address at 1010 4TH St SW, Mason City, IA, 50401. Phone: (641) 428-5700. Providers update this record themselves, so call before visiting.
How can I verify Zachary S. Fuller, DO's license?
NPPES lists Iowa license number DO-06810, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Zachary S. Fuller, DO prescribe under Medicare Part D?
In 2024, Zachary S. Fuller, DO had 326 Medicare Part D claims for 106 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.