George M. Sonneborn, AFE23957
Internal Medicine Physician · Pasadena, CA
George M. Sonneborn, AFE23957 is an internal medicine physician with a practice address in Pasadena, California, and NPI 1922187962, issued on Nov 2, 2006. Check the license (California AFE23957, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- George M. Sonneborn
- Credential
- AFE23957
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- AFE23957 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1855 N Fair Oaks Ave # 200, Pasadena, CA 91103
- Phone
- (626) 398-6300
- Enumerated
- Nov 2, 2006
- Record last updated
- May 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (626) 398-5840
- Medicaid IDs
- FHC70768F CA
HAP70768F CA
EAP70768F CA - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1855 N Fair Oaks Ave # 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jochen Strack, MSN, RNNurse Practitioner1558712349
Verify George M. Sonneborn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license AFE23957Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
12 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
George M. Sonneborn among 17,696 internal medicine physician records in California
George M. Sonneborn, AFE23957 is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2008 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
137 internal medicine physician records list a practice address in Pasadena
They are 137 of the 10,525 NPPES records with a practice address in Pasadena, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Pasadena → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael Gottlieb, MDPasadena, CA 911031871506808
- Robert Ladines, M.D.Pasadena, CA 911031033219084
- Muhammad Nasir, M.D.Pasadena, CA 911031427002526
- Arthur Manoukian, M.D.Pasadena, CA 911041811948540
- Dolores Barba, MDPasadena, CA 911051992700603
- Barry Blum, MDPasadena, CA 911051639141716
- Warren Brown, M.D.Pasadena, CA 911011083776322
- Edmond Clinton, M.D.Pasadena, CA 911011720094097
Common questions
What is George M. Sonneborn, AFE23957's NPI number?
George M. Sonneborn, AFE23957's National Provider Identifier (NPI) is 1922187962, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is George M. Sonneborn, AFE23957 located?
The NPPES record lists a practice address at 1855 N Fair Oaks Ave # 200, Pasadena, CA, 91103. Phone: (626) 398-6300. Providers update this record themselves, so call before visiting.
How can I verify George M. Sonneborn, AFE23957's license?
NPPES lists California license number AFE23957, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does George M. Sonneborn, AFE23957 prescribe under Medicare Part D?
In 2024, George M. Sonneborn, AFE23957 had 12 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.