Marc Nielsen, DO
Family Medicine Physician · Susanville, CA
Marc Nielsen, DO is a family medicine physician with a practice address in Susanville, California, and NPI 1265601207, issued on Feb 25, 2008. Check the license (California 20A 10672, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marc Nielsen
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A 10672 CA
Self-reported in NPPES; status is on the state search - Practice location
- 795 Joaquin St, Susanville, CA 96130
- Phone
- (530) 257-2542
- Enumerated
- Feb 25, 2008
- Record last updated
- Sep 21, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100319000560); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 795 Joaquin St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Christina Carlton, M.D.Pediatrics Physician1659467405
- June Glenn-Lawson, MDFamily Medicine Physician1124233408
- Lauren Haugh, PHARMDPharmacist1174298194
- Constance Herman, FNPFamily Nurse Practitioner1538179643
Verify Marc Nielsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A 10672Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
88 Medicare Part D claims for 63 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Azithromycin11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Eastern Plumas Health Care DistrictPortola, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marc Nielsen among 17,133 family medicine physician records in California
Marc Nielsen, DO is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 53% of them.
- NPI issued2008 · 53% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2007 · median 2005 among the 10,652 with a school on file
- Record last updated2018 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 family medicine physician records list a practice address in Susanville
They are 12 of the 317 NPPES records with a practice address in Susanville, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Susanville → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Samuel Carlton, MDSusanville, CA 961301437156866
- John Dozier, M.D.Susanville, CA 961301750398962
- Timothy Eckford, M.D.Susanville, CA 961301487093076
- June Glenn-Lawson, MDSusanville, CA 961301124233408
- Paul Holmes, MDSusanville, CA 961301215940168
- Kenneth Korver, M.D.Susanville, CA 961301326159633
- Christopher Morgan, M.D.Susanville, CA 961301770590077
- Rachel Petersen, M.D.Susanville, CA 961301528353323
Common questions
What is Marc Nielsen, DO's NPI number?
Marc Nielsen, DO's National Provider Identifier (NPI) is 1265601207, issued on Feb 25, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Marc Nielsen, DO located?
The NPPES record lists a practice address at 795 Joaquin St, Susanville, CA, 96130. Phone: (530) 257-2542. Providers update this record themselves, so call before visiting.
How can I verify Marc Nielsen, DO's license?
NPPES lists California license number 20A 10672, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marc Nielsen, DO prescribe under Medicare Part D?
In 2024, Marc Nielsen, DO had 88 Medicare Part D claims for 63 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.