DR. FIRAS NAJI D.O.
NPI 1578883997
Internal Medicine in Irvine, CA
About Dr. Firas Naji D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. FIRAS NAJI D.O. (NPI 1578883997) is an individual internal medicine provider in Irvine, California, licensed in Massachusetts (253997) and active in the NPI registry since June 2010. He is enrolled in Medicare PECOS and is a graduate of University Of New England, College Of Osteo Medicine (2010).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Accepted Insurance
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. Firas Naji D.o. 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
8Medicare enrollment records show Firas Naji reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 250 clinicians in this Medicare group
Duarte, CA 91010
- Reassigned Medicare billing, California enrollment
- 1,335 clinicians in this Medicare group
Gilroy, CA 95020
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1629301346 (California), NPI 1588721500 (California)
- 2,460 clinicians in this Medicare group
North Adams, MA 01247
- Reassigned Medicare billing, Massachusetts enrollment
- 337 clinicians in this Medicare group
Cambridge, MA 02139
- Reassigned Medicare billing, Massachusetts enrollment
- 719 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- 1,477 clinicians in this Medicare group
Brockton, MA 02301
- Reassigned Medicare billing, Massachusetts enrollment
- 173 clinicians in this Medicare group
Hyannis, MA 02601
- Reassigned Medicare billing, Massachusetts enrollment
- 678 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 4
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 92614 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Firas Naji's NPI number?
The NPI number for Firas Naji is 1578883997. It was assigned to this individual provider in the NPPES registry on June 8, 2010.
Where is Firas Naji located?
Firas Naji practices at 17595 Harvard Ave Ste C-803, Irvine, CA 92614. The listed phone number is (949) 981-5033.
What is Firas Naji's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Firas Naji enrolled in Medicare?
Yes. Firas Naji 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 Firas Naji's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Firas Naji reassigns Medicare benefits to 8 organizations: The Regents Of The University Of California-Irvine (Orange, CA), City Of Hope Medical Foundation (Duarte, CA), County Of Santa Clara (Gilroy, CA), Sound Physicians Of Massachusetts Inc (North Adams, MA), Cambridge Public Health Commission (Cambridge, MA) and 3 more organizations, listed in the Medicare section above. 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 Firas Naji's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Firas Naji accept?
Health plans from Taro Health list Firas Naji as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Firas Naji was last updated on November 27, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Firas Naji, D.O. · NPI 1578883997
Internal Medicine physician in Irvine, California. Individual provider, active in the CMS NPPES registry since June 8, 2010.
## Identity
- **NPI:** 1578883997 (Entity type: Individual)
- **Enumerated:** June 8, 2010
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 253997 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 17595 HARVARD AVE STE C-803, Irvine, CA 92614-8516
- **Phone:** (949) 981-5033 · **Fax:** (949) 272-9976
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): The Regents Of The University Of California-Irvine (NPI 1154479723, Orange, CA); City Of Hope Medical Foundation (NPI 1871886366, Duarte, CA); County Of Santa Clara (NPI 1922093533, Gilroy, CA); Sound Physicians Of Massachusetts Inc (NPI 1205164951, North Adams, MA); Cambridge Public Health Commission (NPI 1487603585, Cambridge, MA); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of New England, College Of Osteo Medicine, class of 2010
## Record status
- **NPPES last updated:** November 27, 2023
- **Other identifiers:** Medicaid 110099862A (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1578883997) · Data from the CMS NPPES public registry.