Timothy Chang, MD
NPI 1437594496 · Urology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Chang, MD is a Urology Physician provider in Stanford, CA (NPI 1437594496).
Provider details
- NPI number
- 1437594496
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A131727 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
505 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 96 | $111 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 68 | $111 |
| Insertion of Stent in Ureter Using an Endoscope52332 | 55 | $146 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 52 | $153 |
| Crushing of Stone of Ureter With Insertion of Stent Using an Endoscope52356 | 40 | $458 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 70 | 30 |
| Cephalexin | 19 | 12 |
| Finasteride | 13 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$308 across 37 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
Additional practice locations (1)
- 49 Showers Dr Apt A337Mountain View, CA 94040-1483Phone: (617) 872-8736
Registry dates
- Enumerated
- 2013-05-05
- Last updated
- 2024-03-13
- Certified
- 2024-03-13
Frequently asked questions
- What is Timothy Chang's NPI number?
- Timothy Chang's National Provider Identifier (NPI) is 1437594496, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Chang's specialty?
- Timothy Chang is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Chang located?
- Timothy Chang's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Timothy Chang's phone number?
- The practice phone number listed in the NPPES registry for Timothy Chang is (650) 725-5746.
- Does Timothy Chang accept Medicare?
- Timothy Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Chang's NPI active?
- Yes — Timothy Chang's NPI (1437594496) is active in the NPPES registry as of the last update on 2024-03-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.