Gary Chien, M.D.
NPI 1639121395 · Urology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Chien, M.D. is a Urology Physician provider in Los Angeles, CA (NPI 1639121395).
Provider details
- NPI number
- 1639121395
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A67944 (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
20 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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Finasteride | 248 | 78 |
| Tamsulosin Hcl | 110 | 43 |
| Terazosin Hcl | 104 | 36 |
| Potassium Citratebrand: Potassium Citrate Er | 18 | — |
| Trospium Chloride | 15 | — |
| Estradiol | 14 | 11 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 14 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-17
- Last updated
- 2021-11-18
Frequently asked questions
- What is Gary Chien's NPI number?
- Gary Chien's National Provider Identifier (NPI) is 1639121395, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Chien's specialty?
- Gary Chien is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Chien located?
- Gary Chien's practice location on file with NPPES is 4900 W Sunset Blvd, Los Angeles, CA 90027-5814.
- What is Gary Chien's phone number?
- The practice phone number listed in the NPPES registry for Gary Chien is (800) 954-8000.
- Does Gary Chien accept Medicare?
- Gary Chien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Chien's NPI active?
- Yes — Gary Chien's NPI (1639121395) 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.