William Grandolfo, M.D.
NPI 1649596479 · Diagnostic Radiology Physician · Fountain Valley, CA
Enrolled with Medicare as Order and Referring Only - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grandolfo, M.D. is a Diagnostic Radiology Physician provider in Fountain Valley, CA (NPI 1649596479).
Provider details
- NPI number
- 1649596479
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G13336 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 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
- 2010-04-19
- Last updated
- 2010-04-19
Frequently asked questions
- What is William Grandolfo's NPI number?
- William Grandolfo's National Provider Identifier (NPI) is 1649596479, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grandolfo's specialty?
- William Grandolfo is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Grandolfo located?
- William Grandolfo's practice location on file with NPPES is 17330 Brookhurst Street, Fountain Valley, CA 92708.
- What is William Grandolfo's phone number?
- The practice phone number listed in the NPPES registry for William Grandolfo is (714) 377-3198.
- Does William Grandolfo accept Medicare?
- William Grandolfo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grandolfo's NPI active?
- Yes — William Grandolfo's NPI (1649596479) is active in the NPPES registry as of the last update on 2010-04-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.