Sonya M. Ehresmann, M.D.
Internal Medicine Physician · San Marino, CA
Sonya M. Ehresmann, M.D. is an internal medicine physician with a practice address in San Marino, California, and NPI 1750533212, issued on Oct 15, 2008. Check the license (California A100206, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sonya M. Ehresmann
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A100206 CA
Self-reported in NPPES; status is on the state search - Practice location
- 375 Huntington Dr Ste G, San Marino, CA 91108
- Phone
- (626) 441-4231
- Enumerated
- Oct 15, 2008
- Record last updated
- May 5, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (626) 441-0282
- Medicare enrollment
- Enrolled (PECOS I20090225000242); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 375 Huntington Dr Ste G
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Derek Cheung, MDInternal Medicine Physician1336671981
- Ya-Gin Hanna Huang, MDInternal Medicine Physician1265012520
- Jennifer Oh, NPFamily Nurse Practitioner1578968913
- John WearInternal Medicine Physician1255080198
Verify Sonya M. Ehresmann in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A100206Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,065 Medicare Part D claims for 378 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 36 claims were for opioids.
Most prescribed
- Atorvastatin Calcium298 claims
- Amlodipine Besylate290 claims
- Losartan Potassium140 claims
- Levothyroxine Sodium127 claims
- Metformin Hcl107 claims
- Rosuvastatin Calcium82 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.
Industry payments in 2024: $142.25
2 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Huntington Medical FoundationSan Marino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
11 internal medicine physician records list a practice address in San Marino
They are 11 of the 184 NPPES records with a practice address in San Marino, and 17,696 internal medicine physician records in California.
All 11 in San Marino → All 17,696 in California → Every provider in San Marino →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Sonya M. Ehresmann, M.D.'s NPI number?
Sonya M. Ehresmann, M.D.'s National Provider Identifier (NPI) is 1750533212, issued on Oct 15, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Sonya M. Ehresmann, M.D. located?
The NPPES record lists a practice address at 375 Huntington Dr Ste G, San Marino, CA, 91108. Phone: (626) 441-4231. Providers update this record themselves, so call before visiting.
How can I verify Sonya M. Ehresmann, M.D.'s license?
NPPES lists California license number A100206, 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 Sonya M. Ehresmann, M.D. prescribe under Medicare Part D?
In 2024, Sonya M. Ehresmann, M.D. had 3,065 Medicare Part D claims for 378 beneficiaries; 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.