George Sonneborn, AFE23957
NPI 1922187962 · Internal Medicine Physician · Pasadena, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
George Sonneborn, AFE23957 is a Internal Medicine Physician provider in Pasadena, CA (NPI 1922187962).
Provider details
- NPI number
- 1922187962
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- AFE23957
- Sex
- Male
- Sole proprietor
- No
- License
- AFE23957 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Emergency Medical Service Providers
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
- 2006-11-02
- Last updated
- 2008-05-29
Frequently asked questions
- What is George Sonneborn's NPI number?
- George Sonneborn's National Provider Identifier (NPI) is 1922187962, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is George Sonneborn's specialty?
- George Sonneborn is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is George Sonneborn located?
- George Sonneborn's practice location on file with NPPES is 1855 N Fair Oaks Ave # 200, Pasadena, CA 91103-1620.
- What is George Sonneborn's phone number?
- The practice phone number listed in the NPPES registry for George Sonneborn is (626) 398-6300.
- Does George Sonneborn accept Medicare?
- George Sonneborn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is George Sonneborn's NPI active?
- Yes — George Sonneborn's NPI (1922187962) is active in the NPPES registry as of the last update on 2008-05-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.