Mark Tsai, M.D.
NPI 1962566950 · Gastroenterology Physician · Northridge, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Tsai, M.D. is a Gastroenterology Physician provider in Northridge, CA (NPI 1962566950).
Provider details
- NPI number
- 1962566950
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A38579 (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
- 2006-12-21
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Tsai's NPI number?
- Mark Tsai's National Provider Identifier (NPI) is 1962566950, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Tsai's specialty?
- Mark Tsai is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Tsai located?
- Mark Tsai's practice location on file with NPPES is 18350 Roscoe Blvd, Northridge, CA 91325-4109.
- What is Mark Tsai's phone number?
- The practice phone number listed in the NPPES registry for Mark Tsai is (818) 772-2798.
- Does Mark Tsai accept Medicare?
- Mark Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Tsai's NPI active?
- Yes — Mark Tsai's NPI (1962566950) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.