Matthew Tsai, M.D., PH.D
NPI 1285051177 · Gastroenterology Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Tsai, M.D., PH.D is a Gastroenterology Physician provider in San Diego, CA (NPI 1285051177).
Provider details
- NPI number
- 1285051177
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D
- Sex
- Male
- Sole proprietor
- No
- License
- A138084 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
268 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 67 | $192 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 63 | $252 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 44 | $67 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 43 | $101 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 15 | $176 |
| Colorectal Cancer Screening; Colonoscopy on Individual Not Meeting Criteria for High Risk |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 88 | 86 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 52 | 50 |
| Omeprazole | 36 | 20 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 27 | 27 |
| Linaclotidebrand: Linzess | 21 | — |
| Lubiprostone | 19 | — |
| Ondansetron |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$323 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-03-28
- Last updated
- 2019-12-17
- Certified
- 2019-12-17
Frequently asked questions
- What is Matthew Tsai's NPI number?
- Matthew Tsai's National Provider Identifier (NPI) is 1285051177, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Tsai's specialty?
- Matthew Tsai is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Tsai located?
- Matthew Tsai's practice location on file with NPPES is 200 W Arbor Dr, San Diego, CA 92103-9000.
- What is Matthew Tsai's phone number?
- The practice phone number listed in the NPPES registry for Matthew Tsai is (800) 926-8273.
- Does Matthew Tsai accept Medicare?
- Matthew Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Tsai's NPI active?
- Yes — Matthew Tsai's NPI (1285051177) is active in the NPPES registry as of the last update on 2019-12-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.