James Waterhouse, M.D.
NPI 1881772630 · Internal Medicine Physician · San Leandro, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Waterhouse, M.D. is a Internal Medicine Physician provider in San Leandro, CA (NPI 1881772630).
Provider details
- NPI number
- 1881772630
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G57842 (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 · 96 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 536 | 187 |
| Amlodipine Besylate | 318 | 112 |
| Lisinopril | 311 | 110 |
| Atenolol | 290 | 105 |
| Losartan Potassium | 236 | 81 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 227 | 30 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-11-30
Frequently asked questions
- What is James Waterhouse's NPI number?
- James Waterhouse's National Provider Identifier (NPI) is 1881772630, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Waterhouse's specialty?
- James Waterhouse is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Waterhouse located?
- James Waterhouse's practice location on file with NPPES is 2500 Merced St, San Leandro, CA 94577-4201.
- What is James Waterhouse's phone number?
- The practice phone number listed in the NPPES registry for James Waterhouse is (510) 454-1000.
- Does James Waterhouse accept Medicare?
- James Waterhouse is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Waterhouse's NPI active?
- Yes — James Waterhouse's NPI (1881772630) is active in the NPPES registry as of the last update on 2021-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.