Terrence Tan, D.O.
NPI 1851622435 · Internal Medicine Physician · Colton, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Terrence Tan, D.O. is a Internal Medicine Physician provider in Colton, CA (NPI 1851622435).
Provider details
- NPI number
- 1851622435
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A11111 (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
16 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 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 339 | 140 |
| Prednisone | 312 | 152 |
| Methotrexate Sodiumbrand: Methotrexate | 189 | 88 |
| Leflunomide | 117 | 56 |
| Etanerceptbrand: Enbrel Sureclick | 112 | 16 |
| Adalimumab-Attobrand: Amjevita(cf) Autoinjector | 106 | 29 |
| Meloxicam |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-01-21
- Last updated
- 2021-11-18
- Certified
- 2021-11-18
Frequently asked questions
- What is Terrence Tan's NPI number?
- Terrence Tan's National Provider Identifier (NPI) is 1851622435, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Terrence Tan's specialty?
- Terrence Tan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Terrence Tan located?
- Terrence Tan's practice location on file with NPPES is 400 N Pepper Ave, Colton, CA 92324-1801.
- What is Terrence Tan's phone number?
- The practice phone number listed in the NPPES registry for Terrence Tan is (909) 580-6275.
- Does Terrence Tan accept Medicare?
- Terrence Tan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Terrence Tan's NPI active?
- Yes — Terrence Tan's NPI (1851622435) is active in the NPPES registry as of the last update on 2021-11-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.