Nels Gunnarsen, M.D.
NPI 1821193160 · Diagnostic Radiology Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nels Gunnarsen, M.D. is a Diagnostic Radiology Physician provider in Sacramento, CA (NPI 1821193160).
Provider details
- NPI number
- 1821193160
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G87827 (CA)
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
598 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) |
|---|---|---|
| Screening 3d Breast Mammography77063 | 116 | $28 |
| Screening Mammography77067 | 116 | $36 |
| Diagnostic Digital Breast Tomosynthesis, Unilateral Or Bilateral (list Separately in Addition to 77065 Or 77066)G0279 | 114 | $28 |
| Limited Ultrasound Scan of 1 Breast76642 | 89 | $34 |
| Diagnostic Mammography of 1 Breast77065 | 82 | $38 |
| Diagnostic Mammography of Both Breasts77066 | 62 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$24 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
- 2006-09-13
- Last updated
- 2023-03-07
Frequently asked questions
- What is Nels Gunnarsen's NPI number?
- Nels Gunnarsen's National Provider Identifier (NPI) is 1821193160, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nels Gunnarsen's specialty?
- Nels Gunnarsen is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Nels Gunnarsen located?
- Nels Gunnarsen's practice location on file with NPPES is 4860 Y St, Sacramento, CA 95817-2307.
- What is Nels Gunnarsen's phone number?
- The practice phone number listed in the NPPES registry for Nels Gunnarsen is (916) 703-2273.
- Does Nels Gunnarsen accept Medicare?
- Nels Gunnarsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nels Gunnarsen's NPI active?
- Yes — Nels Gunnarsen's NPI (1821193160) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.