Timothy Ong, MD
NPI 1033125075 · Internal Medicine Physician · San Jose, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Ong, MD is a Internal Medicine Physician provider in San Jose, CA (NPI 1033125075).
Provider details
- NPI number
- 1033125075
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G80475 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
24 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| X-Ray of Chest, 2 Views71046 | 12 | $33 |
| Screening Mammography77067 | 12 | $130 |
Typical Medicare-allowed amounts for these services range $33–$130 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 151 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 654 | 179 |
| Amlodipine Besylate | 564 | 160 |
| Metformin Hcl | 428 | 123 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 369 | 59 |
| Omeprazole | 325 | 97 |
| Losartan Potassium | 274 | 87 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-31
- Last updated
- 2012-02-27
Frequently asked questions
- What is Timothy Ong's NPI number?
- Timothy Ong's National Provider Identifier (NPI) is 1033125075, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Ong's specialty?
- Timothy Ong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Ong located?
- Timothy Ong's practice location on file with NPPES is 2400 Moorpark Ave, San Jose, CA 95128-2631.
- What is Timothy Ong's phone number?
- The practice phone number listed in the NPPES registry for Timothy Ong is (408) 885-5000.
- Does Timothy Ong accept Medicare?
- Timothy Ong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Ong's NPI active?
- Yes — Timothy Ong's NPI (1033125075) is active in the NPPES registry as of the last update on 2012-02-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.