Andrew Chen, M.D.
NPI 1811039480 · Urology Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Chen, M.D. is a Urology Physician provider in Walnut Creek, CA (NPI 1811039480).
Provider details
- NPI number
- 1811039480
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 238799 (NY)
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 tenure33% of score
19 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 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Finasteride | 438 | 151 |
| Tamsulosin Hcl | 404 | 151 |
| Trospium Chloride | 98 | 34 |
| Terazosin Hcl | 68 | 21 |
| Ciprofloxacin Hcl | 62 | 51 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 40 | 36 |
| Potassium Citratebrand: Potassium Citrate Er | 37 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$174 across 1 record (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
- 2007-02-12
- Last updated
- 2022-02-11
Frequently asked questions
- What is Andrew Chen's NPI number?
- Andrew Chen's National Provider Identifier (NPI) is 1811039480, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Chen's specialty?
- Andrew Chen is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Chen located?
- Andrew Chen's practice location on file with NPPES is 1425 S Main St, Walnut Creek, CA 94596-5318.
- What is Andrew Chen's phone number?
- The practice phone number listed in the NPPES registry for Andrew Chen is (310) 869-6386.
- Does Andrew Chen accept Medicare?
- Andrew Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Chen's NPI active?
- Yes — Andrew Chen's NPI (1811039480) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.