John Herziger, MD
NPI 1518097914 · Internal Medicine Physician · Sierra Madre, CA
John Herziger, MD is a Internal Medicine Physician provider in Sierra Madre, CA (NPI 1518097914).
Provider details
- NPI number
- 1518097914
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G33335 (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
- 2007-03-06
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Herziger's NPI number?
- John Herziger's National Provider Identifier (NPI) is 1518097914, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Herziger's specialty?
- John Herziger is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Herziger located?
- John Herziger's practice location on file with NPPES is 292 W Montecito Ave, Sierra Madre, CA 91024-1835.
- What is John Herziger's phone number?
- The practice phone number listed in the NPPES registry for John Herziger is (626) 466-1076.
- Is John Herziger's NPI active?
- Yes — John Herziger's NPI (1518097914) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.