John Duong, M.D.
NPI 1356364889 · Internal Medicine Physician · Long Beach, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Duong, M.D. is a Internal Medicine Physician provider in Long Beach, CA (NPI 1356364889).
Provider details
- NPI number
- 1356364889
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A66685 (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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (1)
- 19191 S Vermont AveTorrance, CA 90502-1018Phone: (310) 354-4221
Registry dates
- Enumerated
- 2006-07-25
- Last updated
- 2026-01-18
- Certified
- 2026-01-18
Frequently asked questions
- What is John Duong's NPI number?
- John Duong's National Provider Identifier (NPI) is 1356364889, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Duong's specialty?
- John Duong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Duong located?
- John Duong's practice location on file with NPPES is 4540 E 7th St, Long Beach, CA 90804-4327.
- What is John Duong's phone number?
- The practice phone number listed in the NPPES registry for John Duong is (562) 344-1150.
- Does John Duong accept Medicare?
- John Duong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Duong's NPI active?
- Yes — John Duong's NPI (1356364889) is active in the NPPES registry as of the last update on 2026-01-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.