Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Marc Nielsen, DO

Individual provider Family Medicine Physician · NPI 1265601207

Marc Nielsen, DO is a Family Practice in Susanville, California. Qualified in 2007, 19 years ago. Practices with Seneca Healthcare District, a 22-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
19
Licensed in
CA
In the registry since
2008
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

795 Joaquin St
Susanville, CA 96130-3628
Phone: (530) 257-2542
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 500 1st Ave, Portola, CA 96122-9406 — (530) 832-6500
  • 1800 Spring Ridge Dr, Susanville, CA 96130-6100 — (530) 252-2000

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 20A 10672 (CA)

Record details

NPI number1265601207
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedFebruary 25, 2008
Last updated in NPPESSeptember 21, 2018
Mailing addressPo Box 476, Chester, CA 96020-0476

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Also practisesEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2007 (19 years in practice)
Group practice Seneca Healthcare District — 22 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Susanville