John Otsuki, MD
NPI 1952460602 · Family Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Otsuki, MD is a Family Medicine Physician provider in Fontana, CA (NPI 1952460602).
Provider details
- NPI number
- 1952460602
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A77046 (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 | 558 | 193 |
| Lisinopril | 269 | 95 |
| Amlodipine Besylate | 256 | 91 |
| Rosuvastatin Calcium | 237 | 90 |
| Omeprazole | 196 | 66 |
| Metformin Hcl | 183 | 60 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-08
- Last updated
- 2021-11-30
Frequently asked questions
- What is John Otsuki's NPI number?
- John Otsuki's National Provider Identifier (NPI) is 1952460602, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Otsuki's specialty?
- John Otsuki is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Otsuki located?
- John Otsuki's practice location on file with NPPES is 9961 Sierra Ave, Fontana, CA 92335-6720.
- What is John Otsuki's phone number?
- The practice phone number listed in the NPPES registry for John Otsuki is (909) 427-3910.
- Does John Otsuki accept Medicare?
- John Otsuki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Otsuki's NPI active?
- Yes — John Otsuki's NPI (1952460602) 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.