MARC NIELSEN (DO) – Family Medicine Physician, NPI 1265601207
Family Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
13,194 FAMILY PRACTICE in CA
Provider Addresses for MARC NIELSEN (DO)
500 1st Ave
Portola, CA 961229406
Phone: (530) 832-6500
Type: Location
1800 Spring Ridge Dr
Susanville, CA 961306100
Phone: (530) 252-2000
Type: Location
PO box, Russell Road, Paoli, Tredyffrin Township, Chester County, Pennsylvania, 19301, United States
CHESTER, CA 960200476
Phone: (925) 324-5062
Type: Mailing
795, Joaquin Street, Susanville, Lassen County, California, 96130, United States
SUSANVILLE, CA 961303628
Phone: (530) 257-2542
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-03-19
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100319000560 | I | Family Practice | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 96122)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | CA | |
| Nurse Practitioner | CA | |
| Endocrinology, Internal Medicine, Endocrinology | CA | |
| Orthopedic Surgery | CA | |
| Family Practice | CA | |
| Diagnostic Radiology | WI | |
| Emergency Medicine | CA | |
| Emergency Medicine, Internal Medicine | CA | |
| Registered Dietitian Or Nutrition Professional | IL | |
| - | CA |
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