What is Allen Chang's NPI number?

Allen Chang's National Provider Identifier (NPI) is 1669765657, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Allen Chang's specialty?

Allen Chang is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).

Where is Allen Chang located?

Allen Chang's practice location on file with NPPES is 4900 W Sunset Blvd Fl 2, Los Angeles, CA 90027-5814.

What is Allen Chang's phone number?

The practice phone number listed in the NPPES registry for Allen Chang is (323) 783-5500.

Does Allen Chang accept Medicare?

Allen Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Allen Chang's NPI active?

Yes — Allen Chang's NPI (1669765657) is active in the NPPES registry as of the last update on 2021-12-08.

IndividualActiveAccepts Medicare

Allen Chang, M.D.

NPI 1669765657 · Urology Physician · Los Angeles, CA

Allen Chang, M.D. is a Urology Physician provider in Los Angeles, CA (NPI 1669765657).

Provider details

NPI number: 1669765657
Entity type: Individual
Primary specialty: Urology PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: No
License: A109778 (CA)

Practice location

4900 W Sunset Blvd Fl 2

Los Angeles, CA 90027-5814

Phone: (323) 783-5500

Street-level locationGet directions

More CA providers

Mailing address

4900 W Sunset Blvd Fl 2

Los Angeles, CA 90027-5814

Specialties & taxonomies

Urology PhysicianPrimary208800000XLicense A109778 (CA)
Allopathic & Osteopathic Physicians

Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(84/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure33% of score
15 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 · 22 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Finasteride	820	284
Tamsulosin Hcl	648	265
Ciprofloxacin Hcl	144	121
Mirabegronbrand: Myrbetriq	108	42
Potassium Citratebrand: Potassium Citrate Er	101	47
Methenamine Hippurate	97	42
Terazosin Hcl	86	29

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$123 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.

Enumerated: 2011-05-24
Last updated: 2021-12-08

Frequently asked questions

What is Allen Chang's NPI number?: Allen Chang's National Provider Identifier (NPI) is 1669765657, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Allen Chang's specialty?: Allen Chang is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
Where is Allen Chang located?: Allen Chang's practice location on file with NPPES is 4900 W Sunset Blvd Fl 2, Los Angeles, CA 90027-5814.
What is Allen Chang's phone number?: The practice phone number listed in the NPPES registry for Allen Chang is (323) 783-5500.
Does Allen Chang accept Medicare?: Allen Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Allen Chang's NPI active?: Yes — Allen Chang's NPI (1669765657) is active in the NPPES registry as of the last update on 2021-12-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Frequently asked questions

Profile Score

What this provider prescribes (Medicare Part D)

Transparency — industry payments