Sonja Nicole Loo, M.D.
Anesthesiology Physician · Santa Monica, CA
Sonja Nicole Loo, M.D. is an anesthesiology physician with a practice address in Santa Monica, California, and NPI 1952563108, issued on Jun 30, 2008. Check the license (California A123220, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sonja Nicole Loo
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- A123220 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2121 Santa Monica Blvd, Santa Monica, CA 90404
- Phone
- (503) 468-6333
- Enumerated
- Jun 30, 2008
- Record last updated
- Nov 19, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140106000714); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2008
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 7,571 in California → Look up another NPI →
Also registered at 2121 Santa Monica Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Daniel ArtensteinStudent in an Organized Health Care Education/Training Program1023402310
- Bita Azizi, RDRegistered Dietitian1861797839
Verify Sonja Nicole Loo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A123220Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Western Anesthesia Medical Associates IncMission Viejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sonja Nicole Loo among 7,571 anesthesiology physician records in California
Sonja Nicole Loo, M.D. is one of 7,571 anesthesiology physician records with a practice address in California. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 57% of them.
- NPI issued2008 · 57% of these records are older, 39% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2008 · median 2006 among the 4,868 with a school on file
- Record last updated2013 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anesthesiology Physician providers in California
There are 7,571 anesthesiology physician records in California.
All 7,571 in California → Every provider in Santa Monica → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Laura Alexander, MDSanta Monica, CA 904041699763094
- Sophie Andriaschuk, M.D.Santa Monica, CA 904041063421378
- Thomas Bohlmann, M.D.Santa Monica, CA 904041265448195
- Grace Chang, MDSanta Monica, CA 904041720024789
- James Cowman, M.D.Santa Monica, CA 904041770696510
- George Herr, M.D.Santa Monica, CA 904041578575395
- Eric Hsu, MDSanta Monica, CA 904041972537835
- Roger Mah, M.D.Santa Monica, CA 904041477564185
Common questions
What is Sonja Nicole Loo, M.D.'s NPI number?
Sonja Nicole Loo, M.D.'s National Provider Identifier (NPI) is 1952563108, issued on Jun 30, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Sonja Nicole Loo, M.D. located?
The NPPES record lists a practice address at 2121 Santa Monica Blvd, Santa Monica, CA, 90404. Phone: (503) 468-6333. Providers update this record themselves, so call before visiting.
How can I verify Sonja Nicole Loo, M.D.'s license?
NPPES lists California license number A123220, 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.
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.