Gastroenterology Specialists Medical Group, Inc a Medical Corporation
NPI 1629170998 · Gastroenterology Physician · Castro Valley, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gastroenterology Specialists Medical Group, Inc a Medical Corporation is a Gastroenterology Physician organization in Castro Valley, CA (NPI 1629170998).
Provider details
- NPI number
- 1629170998
- Entity type
- Organization
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Wei-Fang Ko Ko, President(510) 537-4415
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
Other names (DBA / former)
- Former legal business name
- Gastroenterology Specialists Medical Group
- Former legal business name
- Gastroenterology Specialists Medical Group
Registry dates
- Enumerated
- 2006-09-05
- Last updated
- 2022-08-01
- Certified
- 2022-08-01
Frequently asked questions
- What is Gastroenterology Specialists Medical Group, Inc a Medical Corporation's NPI number?
- Gastroenterology Specialists Medical Group, Inc a Medical Corporation's National Provider Identifier (NPI) is 1629170998, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Gastroenterology Specialists Medical Group, Inc a Medical Corporation?
- Gastroenterology Specialists Medical Group, Inc a Medical Corporation is classified in the NPPES registry as Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Gastroenterology Specialists Medical Group, Inc a Medical Corporation located?
- Gastroenterology Specialists Medical Group, Inc a Medical Corporation's practice location on file with NPPES is 19845 Lake Chabot Rd, Castro Valley, CA 94546-4055.
- What is Gastroenterology Specialists Medical Group, Inc a Medical Corporation's phone number?
- The practice phone number listed in the NPPES registry for Gastroenterology Specialists Medical Group, Inc a Medical Corporation is (510) 537-4415.
- Does Gastroenterology Specialists Medical Group, Inc a Medical Corporation accept Medicare?
- Gastroenterology Specialists Medical Group, Inc a Medical Corporation is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Gastroenterology Specialists Medical Group, Inc a Medical Corporation?
- The authorized official listed on Gastroenterology Specialists Medical Group, Inc a Medical Corporation's NPPES record is Wei-Fang Ko Ko, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Gastroenterology Specialists Medical Group, Inc a Medical Corporation's NPI active?
- Yes — Gastroenterology Specialists Medical Group, Inc a Medical Corporation's NPI (1629170998) is active in the NPPES registry as of the last update on 2022-08-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.