Dionisio Fernandes, MD
NPI 1285691121 · Allergy Physician · San Leandro, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dionisio Fernandes, MD is a Allergy Physician provider in San Leandro, CA (NPI 1285691121).
Provider details
- NPI number
- 1285691121
- Entity type
- Individual
- Primary specialty
- Allergy PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A29416 (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
20 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
- 2006-04-26
- Last updated
- 2018-10-25
Frequently asked questions
- What is Dionisio Fernandes's NPI number?
- Dionisio Fernandes's National Provider Identifier (NPI) is 1285691121, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dionisio Fernandes's specialty?
- Dionisio Fernandes is listed in the NPPES registry with a primary specialty of Allergy Physician (Allopathic & Osteopathic Physicians).
- Where is Dionisio Fernandes located?
- Dionisio Fernandes's practice location on file with NPPES is 13847 E 14th St., San Leandro, CA 94578.
- What is Dionisio Fernandes's phone number?
- The practice phone number listed in the NPPES registry for Dionisio Fernandes is (510) 352-8585.
- Does Dionisio Fernandes accept Medicare?
- Dionisio Fernandes is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dionisio Fernandes's NPI active?
- Yes — Dionisio Fernandes's NPI (1285691121) is active in the NPPES registry as of the last update on 2018-10-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.