Isaac Choy, M.D.
NPI 1578641320 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · San Leandro, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Isaac Choy, M.D. is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in San Leandro, CA (NPI 1578641320).
Provider details
- NPI number
- 1578641320
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G78273 (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
19 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
- 2006-11-01
- Last updated
- 2021-12-06
Frequently asked questions
- What is Isaac Choy's NPI number?
- Isaac Choy's National Provider Identifier (NPI) is 1578641320, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Isaac Choy's specialty?
- Isaac Choy is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Isaac Choy located?
- Isaac Choy's practice location on file with NPPES is 2500 Merced St, San Leandro, CA 94577-4201.
- What is Isaac Choy's phone number?
- The practice phone number listed in the NPPES registry for Isaac Choy is (510) 454-1000.
- Does Isaac Choy accept Medicare?
- Isaac Choy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Isaac Choy's NPI active?
- Yes — Isaac Choy's NPI (1578641320) is active in the NPPES registry as of the last update on 2021-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.