DR. SIEF S NASER M.D.
NPI 1598078396
Emergency Medicine in Oroville, CA
About Dr. Sief S Naser M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SIEF S NASER M.D. (NPI 1598078396) is an individual emergency medicine provider in Oroville, California, licensed in California (A124264) and active in the NPI registry since July 2010. He is enrolled in Medicare PECOS and is a graduate of Pennsylvania State University College Of Medicine (2010).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Sief S Naser M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show Sief Naser reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oroville, CA 95966
- Reassigned Medicare billing, California enrollment
- 62 clinicians in this Medicare group
Oroville, CA 95966
- Reassigned Medicare billing, California enrollment
- 267 clinicians in this Medicare group
Fairfield, CA 94533
- Reassigned Medicare billing, California enrollment
- 212 clinicians in this Medicare group
Modesto, CA 95354
- Reassigned Medicare billing, California enrollment
- 180 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95966 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OROVILLE, CA 95966
OROVILLE, CA 95966
OROVILLE, CA 95966
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Sief Naser's NPI number?
The NPI number for Sief Naser is 1598078396. It was assigned to this individual provider in the NPPES registry on July 21, 2010.
Where is Sief Naser located?
Sief Naser practices at 2767 Olive Hwy, Oroville, CA 95966. The listed phone number is (530) 533-8500.
What is Sief Naser's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Sief Naser enrolled in Medicare?
Yes. Sief Naser is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Sief Naser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sief Naser reassigns Medicare benefits to 4 organizations: Oroville Hospital (Oroville, CA), Orohealth Corporation A Non Profit Healthcare System (Oroville, CA), Solano Gateway Medical Group Inc (Fairfield, CA) and American Specialty Physicians Group Inc (Modesto, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Sief Naser's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Sief Naser was last updated on July 12, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Sief S Naser, M.D. · NPI 1598078396
Emergency Medicine physician in Oroville, California. Individual provider, active in the CMS NPPES registry since July 21, 2010.
## Identity
- **NPI:** 1598078396 (Entity type: Individual)
- **Enumerated:** July 21, 2010
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A124264 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2767 OLIVE HWY, Oroville, CA 95966-6118
- **Phone:** (530) 533-8500 · **Fax:** (530) 538-3117
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Oroville Hospital (NPI 1629512934, Oroville, CA); Orohealth Corporation A Non Profit Healthcare System (NPI 1013933167, Oroville, CA); Solano Gateway Medical Group Inc (NPI 1952344293, Fairfield, CA); American Specialty Physicians Group Inc (NPI 1164363024, Modesto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Pennsylvania State University College Of Medicine, class of 2010
## Record status
- **NPPES last updated:** July 12, 2016
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Source: [NPI Profile](https://npiprofile.com/npi/1598078396) · Data from the CMS NPPES public registry.