Mark Berntsen, MD
NPI 1730166687 · Internal Medicine Physician · Greeley, CO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Berntsen, MD is a Internal Medicine Physician provider in Greeley, CO (NPI 1730166687).
Provider details
- NPI number
- 1730166687
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35897 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,484 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 | 828 | $82 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 685 | $63 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 548 | $44 |
| Administration of Influenza Virus VaccineG0008 | 114 | $33 |
| Hemoglobin A1c Level83036 | 68 | $9 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 58 | $11 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 223 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 1,362 | 344 |
| Amlodipine Besylate | 1,252 | 332 |
| Atorvastatin Calcium | 1,221 | 346 |
| Lisinopril | 1,107 | 294 |
| Losartan Potassium | 1,089 | 295 |
| Omeprazole | 744 | 209 |
| Tamsulosin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-30
- Last updated
- 2013-07-01
Frequently asked questions
- What is Mark Berntsen's NPI number?
- Mark Berntsen's National Provider Identifier (NPI) is 1730166687, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Berntsen's specialty?
- Mark Berntsen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Berntsen located?
- Mark Berntsen's practice location on file with NPPES is 1900 16th St, Greeley, CO 80631-5114.
- What is Mark Berntsen's phone number?
- The practice phone number listed in the NPPES registry for Mark Berntsen is (970) 350-2438.
- Does Mark Berntsen accept Medicare?
- Mark Berntsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Berntsen's NPI active?
- Yes — Mark Berntsen's NPI (1730166687) is active in the NPPES registry as of the last update on 2013-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.