William J. Zaks, MD
Endocrinology, Diabetes & Metabolism Physician · Grand Forks, ND
William J. Zaks, MD is an endocrinology, diabetes & metabolism physician with a practice address in Grand Forks, North Dakota, and NPI 1437249307, issued on Oct 13, 2006. Check the license (North Dakota 7435, as entered in NPPES) on the North Dakota Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- William J. Zaks
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 7435 ND
Self-reported in NPPES; status is on the state search - Practice location
- 1380 S Columbia RD, Grand Forks, ND 58201
- Phone
- (701) 795-2000
- Enumerated
- Oct 13, 2006
- Record last updated
- Oct 1, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100923001376); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 20 in North Dakota → Look up another NPI →
Also registered at 1380 S Columbia RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelsey Adams, FNP-CFamily Nurse Practitioner1366965527
- Mohammad Adie, MDNeonatal-Perinatal Medicine Physician1629270608
- Mollie Alexander, RN, BSN, CDCESDiabetes Educator Registered Nurse1942954755
- Matthew Amundson, MDFamily Medicine Physician1841936184
- Beth Anvarinia, FNP-CFamily Nurse Practitioner1093201402
- Amanda Arneson, AGNP-CGerontology Nurse Practitioner1932847860
Verify William J. Zaks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNorth Dakota Board of Medicine
Search for license 7435Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
6,828 Medicare Part D claims for 540 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims. 96 claims were for opioids.
Most prescribed
- Metformin Hcl447 claims
- Ozempic387 claims
- Levothyroxine Sodium345 claims
- Atorvastatin Calcium318 claims
- Lantus Solostar258 claims
- Farxiga179 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.
Industry payments in 2024: $664.54
14 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Altru Health SystemDevils Lake, ND
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William J. Zaks among 20 endocrinology, diabetes & metabolism physician records in North Dakota
William J. Zaks, MD is one of 20 endocrinology, diabetes & metabolism physician records with a practice address in North Dakota. 55% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 0% of them.
- NPI issued2006 · 0% of these records are older, 50% newer
- In a Medicare fileYes · 55% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Record last updated2020 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a North Dakota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in North Dakota
There are 20 endocrinology, diabetes & metabolism physician records in North Dakota.
All 20 in North Dakota → Every provider in Grand Forks → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Casey Ryan, MDGrand Forks, ND 582011497833933
- Cheryl Beech, CDEFargo, ND 581221679590665
- Shirley Essary, CDEFargo, ND 581221962429829
- Helen Levitt, CDEFargo, ND 581221477571040
- Laurel Bowman, CDEFargo, ND 581031134304421
- Niyutchai Chaithongdi, M.D.Fargo, ND 581031952502700
- Darshan Khangura, M.D.Fargo, ND 581031013357573
- Juan Munoz, MDFargo, ND 581031194742635
Common questions
What is William J. Zaks, MD's NPI number?
William J. Zaks, MD's National Provider Identifier (NPI) is 1437249307, issued on Oct 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William J. Zaks, MD located?
The NPPES record lists a practice address at 1380 S Columbia RD, Grand Forks, ND, 58201. Phone: (701) 795-2000. Providers update this record themselves, so call before visiting.
How can I verify William J. Zaks, MD's license?
NPPES lists North Dakota license number 7435, as entered by the provider. Search the North Dakota Board of Medicine at https://www.ndbom.org/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William J. Zaks, MD prescribe under Medicare Part D?
In 2024, William J. Zaks, MD had 6,828 Medicare Part D claims for 540 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.