Joseph Chao, M.D.
NPI 1285831057 · Medical Oncology Physician · Duarte, CA
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Chao, M.D. is a Medical Oncology Physician provider in Duarte, CA (NPI 1285831057).
Provider details
- NPI number
- 1285831057
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A94368 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
18 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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$28 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
- 2007-06-27
- Last updated
- 2020-11-18
- Certified
- 2020-11-18
Frequently asked questions
- What is Joseph Chao's NPI number?
- Joseph Chao's National Provider Identifier (NPI) is 1285831057, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Chao's specialty?
- Joseph Chao is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Chao located?
- Joseph Chao's practice location on file with NPPES is 1500 Duarte Rd, Duarte, CA 91010-3012.
- What is Joseph Chao's phone number?
- The practice phone number listed in the NPPES registry for Joseph Chao is (626) 471-9200.
- Does Joseph Chao accept Medicare?
- Joseph Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Chao's NPI active?
- Yes — Joseph Chao's NPI (1285831057) is active in the NPPES registry as of the last update on 2020-11-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.