William Zaks, MD
NPI 1437249307 · Endocrinology, Diabetes & Metabolism Physician · Grand Forks, ND
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Zaks, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Grand Forks, ND (NPI 1437249307).
Provider details
- NPI number
- 1437249307
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 7435 (ND)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,348 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 435 | $93 |
| Removal of Fingernails Or Toenails, 6 Or More Nails11721 | 264 | $22 |
| Face-To-Face Behavioral Counseling for Obesity, 15 MinutesG0447 | 251 | $21 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 120 | $16 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 94 | $33 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent Visit |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 117 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metformin Hcl | 447 | 106 |
| Semaglutidebrand: Ozempic | 387 | 61 |
| Levothyroxine Sodium | 345 | 90 |
| Atorvastatin Calcium | 318 | 88 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 258 | 67 |
| Dapagliflozin Propanediolbrand: Farxiga | 179 | 28 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$665 across 14 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-13
- Last updated
- 2020-10-01
- Certified
- 2020-10-01
Frequently asked questions
- What is William Zaks's NPI number?
- William Zaks's National Provider Identifier (NPI) is 1437249307, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Zaks's specialty?
- William Zaks is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is William Zaks located?
- William Zaks's practice location on file with NPPES is 1380 S Columbia Rd, Grand Forks, ND 58201-4059.
- What is William Zaks's phone number?
- The practice phone number listed in the NPPES registry for William Zaks is (701) 795-2000.
- Does William Zaks accept Medicare?
- William Zaks is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Zaks's NPI active?
- Yes — William Zaks's NPI (1437249307) is active in the NPPES registry as of the last update on 2020-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.