Julie Nefkens, MD
NPI 1417029240 · Occupational Medicine Physician · Martinez, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Julie Nefkens, MD is a Occupational Medicine Physician provider in Martinez, CA (NPI 1417029240).
Provider details
- NPI number
- 1417029240
- Entity type
- Individual
- Primary specialty
- Occupational Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G71955 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-15
- Last updated
- 2022-01-11
Frequently asked questions
- What is Julie Nefkens's NPI number?
- Julie Nefkens's National Provider Identifier (NPI) is 1417029240, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Julie Nefkens's specialty?
- Julie Nefkens is listed in the NPPES registry with a primary specialty of Occupational Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Julie Nefkens located?
- Julie Nefkens's practice location on file with NPPES is 200 Muir Rd, Martinez, CA 94553-4614.
- What is Julie Nefkens's phone number?
- The practice phone number listed in the NPPES registry for Julie Nefkens is (925) 372-1000.
- Does Julie Nefkens accept Medicare?
- Julie Nefkens is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Julie Nefkens's NPI active?
- Yes — Julie Nefkens's NPI (1417029240) is active in the NPPES registry as of the last update on 2022-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.