John Nielsen, M.D.
NPI 1003811415 · Family Medicine Physician · Marinette, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Nielsen, M.D. is a Family Medicine Physician provider in Marinette, WI (NPI 1003811415).
Provider details
- NPI number
- 1003811415
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- J8333 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
21 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
270 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 155 | $90 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 40 | $62 |
| 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 | 38 | $16 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 37 | $123 |
Typical Medicare-allowed amounts for these services range $16–$123 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 80 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 222 | 55 |
| Amlodipine Besylate | 135 | 32 |
| Losartan Potassium | 113 | 27 |
| Omeprazole | 107 | 24 |
| Gabapentin | 90 | 23 |
| Pantoprazole Sodium | 80 | 20 |
| Albuterol Sulfate |
Practice location
Mailing address
Additional practice locations (1)
- 702 Davis StSte 4Carthage, TX 75633-1461Phone: (903) 694-4991Fax: (903) 694-4995
Registry dates
- Enumerated
- 2005-06-14
- Last updated
- 2024-12-10
- Certified
- 2024-12-10
Frequently asked questions
- What is John Nielsen's NPI number?
- John Nielsen's National Provider Identifier (NPI) is 1003811415, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Nielsen's specialty?
- John Nielsen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Nielsen located?
- John Nielsen's practice location on file with NPPES is 4061 Old Peshtigo Rd, Marinette, WI 54143-3887.
- What is John Nielsen's phone number?
- The practice phone number listed in the NPPES registry for John Nielsen is (715) 732-8050.
- Does John Nielsen accept Medicare?
- John Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Nielsen's NPI active?
- Yes — John Nielsen's NPI (1003811415) is active in the NPPES registry as of the last update on 2024-12-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.