Mark Nielsen, MD
NPI 1609830843 · Internal Medicine Physician · Bloomington, MN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Nielsen, MD is a Internal Medicine Physician provider in Bloomington, MN (NPI 1609830843).
Provider details
- NPI number
- 1609830843
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35777 (MN)
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
20 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
2,132 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 350 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 320 | $124 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test85027 | 178 | $6 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 160 | $13 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 138 | $10 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 124 | $126 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 120 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 731 | 199 |
| Atorvastatin Calcium | 693 | 187 |
| Amlodipine Besylate | 562 | 158 |
| Simvastatin | 562 | 147 |
| Levothyroxine Sodium | 412 | 102 |
| Losartan Potassium | 350 | 100 |
| Omeprazole | 304 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$27 across 1 record (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
- 2006-04-14
- Last updated
- 2008-05-16
Frequently asked questions
- What is Mark Nielsen's NPI number?
- Mark Nielsen's National Provider Identifier (NPI) is 1609830843, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nielsen's specialty?
- Mark Nielsen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Nielsen located?
- Mark Nielsen's practice location on file with NPPES is 600 W 98th St, Bloomington, MN 55420-4773.
- What is Mark Nielsen's phone number?
- The practice phone number listed in the NPPES registry for Mark Nielsen is (952) 885-6060.
- Does Mark Nielsen accept Medicare?
- Mark Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Nielsen's NPI active?
- Yes — Mark Nielsen's NPI (1609830843) is active in the NPPES registry as of the last update on 2008-05-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.