Matthew Sitzer, MD
NPI 1871641860 · Gastroenterology Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Sitzer, MD is a Gastroenterology Physician provider in San Diego, CA (NPI 1871641860).
Provider details
- NPI number
- 1871641860
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G62045 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 248 | 239 |
| Omeprazole | 210 | 83 |
| Pantoprazole Sodium | 101 | 42 |
| Mesalamine | 86 | 30 |
| Budesonidebrand: Budesonide Dr | 53 | 22 |
| Cholestyramine (with Sugar)brand: Cholestyramine | 35 | 12 |
| Famotidine | 26 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-08
- Last updated
- 2021-12-01
Frequently asked questions
- What is Matthew Sitzer's NPI number?
- Matthew Sitzer's National Provider Identifier (NPI) is 1871641860, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Sitzer's specialty?
- Matthew Sitzer is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Sitzer located?
- Matthew Sitzer's practice location on file with NPPES is 4647 Zion Ave, San Diego, CA 92120-2507.
- What is Matthew Sitzer's phone number?
- The practice phone number listed in the NPPES registry for Matthew Sitzer is (619) 528-5000.
- Does Matthew Sitzer accept Medicare?
- Matthew Sitzer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Sitzer's NPI active?
- Yes — Matthew Sitzer's NPI (1871641860) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.