Cliff Hwang, MD
NPI 1336216266 · Internal Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cliff Hwang, MD is a Internal Medicine Physician provider in Fontana, CA (NPI 1336216266).
Provider details
- NPI number
- 1336216266
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A43665 (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
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2021-11-29
Frequently asked questions
- What is Cliff Hwang's NPI number?
- Cliff Hwang's National Provider Identifier (NPI) is 1336216266, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cliff Hwang's specialty?
- Cliff Hwang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Cliff Hwang located?
- Cliff Hwang's practice location on file with NPPES is 9961 Sierra Ave, Fontana, CA 92335-6720.
- What is Cliff Hwang's phone number?
- The practice phone number listed in the NPPES registry for Cliff Hwang is (909) 427-3910.
- Does Cliff Hwang accept Medicare?
- Cliff Hwang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cliff Hwang's NPI active?
- Yes — Cliff Hwang's NPI (1336216266) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.