Tracy Lin, DO
NPI 1649851718 · Internal Medicine Physician · San Dimas, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tracy Lin, DO is a Internal Medicine Physician provider in San Dimas, CA (NPI 1649851718).
Provider details
- NPI number
- 1649851718
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 20A22787 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
5 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 53 | 20 |
| Amlodipine Besylate | 20 | — |
| Losartan Potassium | 20 | — |
| Levothyroxine Sodium | 18 | — |
| Omeprazole | 14 | — |
| Metformin Hclbrand: Metformin Hcl Er | 14 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$101 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-04-19
- Last updated
- 2026-05-31
- Certified
- 2026-05-31
Frequently asked questions
- What is Tracy Lin's NPI number?
- Tracy Lin's National Provider Identifier (NPI) is 1649851718, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tracy Lin's specialty?
- Tracy Lin is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tracy Lin located?
- Tracy Lin's practice location on file with NPPES is 1335 Cypress St Ste 205, San Dimas, CA 91773-3538.
- What is Tracy Lin's phone number?
- The practice phone number listed in the NPPES registry for Tracy Lin is (909) 542-2777.
- Does Tracy Lin accept Medicare?
- Tracy Lin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tracy Lin's NPI active?
- Yes — Tracy Lin's NPI (1649851718) is active in the NPPES registry as of the last update on 2026-05-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.