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Dr. Marc Nielsen, DO
NPI1265601207PAC ID1557496247
- Medicare services, 2020
- 343
- Part D claims, 2024
- 88
- Publications
- 5
- Hospital affiliations
- 3
- Medical groups
- 3
- Practice address
- 795 Joaquin St, Susanville, CA 96130
- Practice phone
- Call (916) 257-2542
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Lassen Indian Health Center
FQHC - Main Site · Susanville, California
Find Dr. Nielsen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Marc Nielsen is a family medicine physician in Susanville, California
Dr. Nielsen practices at Lassen Indian Health Center in Susanville, California.
Dr. Nielsen's NPI, 1265601207, was assigned on February 25, 2008. Dr. Nielsen graduated from Touro University California - Vallejo in 2007. Dr. Nielsen holds California license 20A 10672.
NPI and contact details
- NPI
- 1265601207NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1557496247
- NPI enumeration date
- February 25, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (916) 257-2542
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marc Nielsen practices at Lassen Indian Health Center in Susanville, California
Dr. Nielsen's primary practice is Lassen Indian Health Center, at 795 Joaquin St, Susanville, CA 96130. The practice phone is (916) 257-2542.
- Lassen Indian Health Center795 Joaquin St, Susanville, CA 96130Phone(916) 257-2542
Source: Dmand AI Affiliation Data
Dr. Marc Nielsen is affiliated with 8 sites of care and 3 medical groups
Dr. Nielsen's primary practice is Lassen Indian Health Center in Susanville, California. Dr. Nielsen is also affiliated with Banner Lassen Medical Center. The medical group on file is Sierra Emergency Medical Group. Dmand AI also links Dr. Nielsen to 2 more hospitals, 2 medical groups, 1 behavioral health center, 1 government or correctional health site, 1 home health agency and 1 rural health clinic, each named with a free account.
Lassen Indian Health CenterPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Marc Nielsen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nielsen practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lassen Indian Health Center | Available with a free account |
| +7 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Nielsen practices
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Dr. Marc Nielsen is one of 15,680 family medicine physicians in California
Family medicine is Dr. Nielsen's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Nielsen is board certified in family medicine by the American Board of Family Medicine. Dmand AI has Dr. Nielsen's licenses on file in 2 states: California and Nevada.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
- Nevada license
Clinical focus
Dmand AI lists acid reflux, acute sinusitis, acute skin infection, ADHD, adjustment disease, aneurysm, anxiety and arthritis among the conditions Dr. Nielsen treats.
Family medicine physicians near Dr. Nielsen
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marc Nielsen billed Medicare for 343 services in 2020
CMS data shows 343 Medicare services from Dr. Nielsen across 4 procedure codes in 2020. Medicare paid $33,289 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2020343
Paid by Medicare$33,289
Procedure codes4
Dr. Nielsen's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 5292020: 34335%
Dr. Nielsen compared with the California median for family medicine physicians, 2020
- Dr. Nielsen
- California median
- Medicare services
- 343vs 24639% above
- Part D claims
- 11vs 83399% below
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Nielsen's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Nielsen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nielsen and other family medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marc Nielsen's patients have a median age of 74
Across all payers, Dmand AI patient panel data puts Dr. Nielsen's median patient age at 74, with 62% women.
Dr. Nielsen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women62%
- Men38%
Source: Dmand AI Patient Panel Data
Dr. Marc Nielsen wrote 88 Medicare Part D claims in 2024
In 2024, Dr. Nielsen wrote 88 Medicare Part D claims for 63 patients. 95% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $48 in total drug cost. In 2023, CMS named 75 claims across 6 drugs.
Part D claims, 202488
Drugs named by CMS1
Total drug cost$48
Part D patients63
Dr. Nielsen's Part D claims by kind of drug, 2024
- Generic84 claims95%
- Brand-name and other4 claims5%
Dr. Nielsen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nielsen's Part D claims, 2024
- Opioids13%11 of 88 claims
- Antibiotics58%51 of 88 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 752024: 1185%
Drugs named by CMS: 1 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Marc Nielsen takes part in Medicare
Dr. Nielsen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Marc Nielsen has 5 publications on record
Dmand AI links 5 papers to Dr. Nielsen, published from 2015 to 2025. 2024 was the busiest year, with 2.
Papers5
Years published2015 to 2025
Dr. Nielsen's papers by year, 2015 to 2025
Recent publications by Dr. Nielsen
Semin Arthritis Rheum
Antibodies, Monoclonal, HumanizedDrug TaperingGiant Cell Arteritis
Metab Brain Dis
AttentionCognition DisordersDiabetes Mellitus, Type 2
Rheumatology (Oxford)
GlucocorticoidsPolymyalgia RheumaticaPrednisolone
See who Dr. Nielsen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Nielsen works with, so you can find a warm path to the right family medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Marc Nielsen graduated from Touro University California - Vallejo
Dr. Nielsen graduated from Touro University California - Vallejo in 2007. Dr. Nielsen is a member of AOA.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Dr. Marc Nielsen accepts plans from 7 insurance carriers
Dr. Nielsen is in network with 7 carriers, including Blue Cross Blue Shield of Michigan, Elevance and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
- NV State Medicaid
Plan types Dr. Nielsen accepts, by number of carriers
- Medicare6
- PPO4
- HMO2
- Medicaid2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Marc Nielsen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marc Nielsen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marc Nielsen's NPI number?
Dr. Marc Nielsen's NPI number is 1265601207. It was assigned on February 25, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Marc Nielsen?
Dr. Marc Nielsen is a family medicine physician in Susanville, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Marc Nielsen practice?
Dr. Nielsen practices at 795 Joaquin St, Susanville, CA 96130. Dr. Nielsen's primary practice is Lassen Indian Health Center in Susanville, California. Dmand AI also links Dr. Nielsen to 2 hospitals, 2 medical groups, 1 behavioral health center, 1 government or correctional health site, 1 home health agency and 1 rural health clinic.
What is Dr. Marc Nielsen's office phone number?
The practice phone on file for Dr. Nielsen is (916) 257-2542.
What is Dr. Marc Nielsen's medical license number?
Dr. Nielsen holds California license 20A 10672, one of the licenses on file in 2 states.
Which states has Dr. Marc Nielsen been licensed in?
Dmand AI has state licenses on file for Dr. Nielsen in California (2009 to 2027) and Nevada (2007 to 2008).
Which hospitals is Dr. Marc Nielsen affiliated with?
Dr. Nielsen is affiliated with Banner Lassen Medical Center. Dmand AI links Dr. Nielsen to 2 more hospitals.
What medical group is Dr. Marc Nielsen part of?
Dr. Nielsen is linked to Sierra Emergency Medical Group. Dmand AI links Dr. Nielsen to 2 more medical groups.
Does Dr. Marc Nielsen accept Medicare?
Yes. CMS data shows Dr. Nielsen billed Medicare for 343 services in 2020, and Dr. Nielsen accepts Medicare assignment.
Is Dr. Marc Nielsen board certified?
Yes. Dr. Nielsen is board certified in family medicine by the American Board of Family Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Marc Nielsen bill to Medicare?
In 2020, Dr. Nielsen's most billed Medicare services were emergency department visit (99285), emergency department visit (99283) and emergency department visit (99284).
Where did Dr. Marc Nielsen go to medical school?
Dr. Nielsen graduated from Touro University California - Vallejo in 2007.
What drugs does Dr. Marc Nielsen prescribe most?
In 2024 Medicare Part D data, Dr. Nielsen's most prescribed drugs by claims were Azithromycin.
How long has Dr. Marc Nielsen been practicing?
Dr. Nielsen graduated from medical school in 2007, 19 years ago.
Does Dr. Marc Nielsen do research?
Dmand AI links 5 publications to Dr. Nielsen, published from 2015 to 2025.
What insurance does Dr. Marc Nielsen accept?
Dr. Nielsen is in network with 7 carriers, including Blue Cross Blue Shield of Michigan, Elevance and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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