Katharine Ozeki, M.D.
NPI 1306290838 · Gastroenterology Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katharine Ozeki, M.D. is a Gastroenterology Physician provider in Walnut Creek, CA (NPI 1306290838).
Provider details
- NPI number
- 1306290838
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
83% 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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 106 | 58 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 100 | 97 |
| Pantoprazole Sodium | 33 | 19 |
| Cholestyramine (with Sugar)brand: Cholestyramine | 26 | — |
| Lubiprostone | 17 | — |
| Metronidazole | 17 | 16 |
| Lipase/Protease/Amylasebrand: Creon | 14 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-04-21
- Last updated
- 2023-07-26
- Certified
- 2023-07-25
Frequently asked questions
- What is Katharine Ozeki's NPI number?
- Katharine Ozeki's National Provider Identifier (NPI) is 1306290838, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katharine Ozeki's specialty?
- Katharine Ozeki is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Katharine Ozeki located?
- Katharine Ozeki's practice location on file with NPPES is 1425 S Main St, Walnut Creek, CA 94596-5318.
- What is Katharine Ozeki's phone number?
- The practice phone number listed in the NPPES registry for Katharine Ozeki is (925) 295-4080.
- Does Katharine Ozeki accept Medicare?
- Katharine Ozeki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katharine Ozeki's NPI active?
- Yes — Katharine Ozeki's NPI (1306290838) is active in the NPPES registry as of the last update on 2023-07-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.