Nellie Nafissi, M.D.
NPI 1821523937 · Hematology & Oncology Physician · Orange, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nellie Nafissi, M.D. is a Hematology & Oncology Physician provider in Orange, CA (NPI 1821523937).
Provider details
- NPI number
- 1821523937
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- R76255 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-26
- Last updated
- 2024-11-19
- Certified
- 2024-11-19
Frequently asked questions
- What is Nellie Nafissi's NPI number?
- Nellie Nafissi's National Provider Identifier (NPI) is 1821523937, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nellie Nafissi's specialty?
- Nellie Nafissi is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Nellie Nafissi located?
- Nellie Nafissi's practice location on file with NPPES is 101 the City Dr S, Orange, CA 92868-3201.
- What is Nellie Nafissi's phone number?
- The practice phone number listed in the NPPES registry for Nellie Nafissi is (714) 456-7890.
- Does Nellie Nafissi accept Medicare?
- Nellie Nafissi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nellie Nafissi's NPI active?
- Yes — Nellie Nafissi's NPI (1821523937) is active in the NPPES registry as of the last update on 2024-11-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.