John Feng, MD
NPI 1346660081 · Internal Medicine Physician · Santa Ana, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Feng, MD is a Internal Medicine Physician provider in Santa Ana, CA (NPI 1346660081).
Provider details
- NPI number
- 1346660081
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A139812 (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
12 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 91 | 22 |
| Amlodipine Besylate | 81 | 20 |
| Apixabanbrand: Eliquis | 71 | 13 |
| Levothyroxine Sodium | 57 | 20 |
| Losartan Potassium | 56 | 18 |
| Potassium Chloride | 50 | — |
| Gabapentin |
Practice location
Mailing address
Additional practice locations (1)
- 6863 Verde Ridge RdRancho Palos Verdes, CA 90275-4637Phone: (310) 619-4995
Registry dates
- Enumerated
- 2014-04-21
- Last updated
- 2019-10-09
Frequently asked questions
- What is John Feng's NPI number?
- John Feng's National Provider Identifier (NPI) is 1346660081, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Feng's specialty?
- John Feng is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Feng located?
- John Feng's practice location on file with NPPES is 3401 W Sunflower Ave Ste 100, Santa Ana, CA 92704.
- What is John Feng's phone number?
- The practice phone number listed in the NPPES registry for John Feng is (888) 789-9585.
- Does John Feng accept Medicare?
- John Feng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Feng's NPI active?
- Yes — John Feng's NPI (1346660081) is active in the NPPES registry as of the last update on 2019-10-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.