Margaret Mou, D.O.
Hospitalist Physician · Los Angeles, CA
Margaret Mou, D.O. is a hospitalist physician with a practice address in Los Angeles, California, and NPI 1679955306, issued on Jun 18, 2015. Check the license (California 20A19116, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret Mou
- Credential
- D.O.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 20A19116 CA
S2125 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4650 W Sunset Blvd, Los Angeles, CA 90027
- Phone
- (323) 660-2450
- Enumerated
- Jun 18, 2015
- Record last updated
- Dec 18, 2025
- Medicare enrollment
- Enrolled (PECOS I20211004001008); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 4650 W Sunset Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Margaret Mou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A19116Check 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
- Childrens Hospital Los Angeles Medical Group IncLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Mou among 3,099 hospitalist physician records in California
Margaret Mou, D.O. is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 66% of them.
- NPI issued2015 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2015 · median 2010 among the 2,505 with a school on file
- Record last updated2025 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Los Angeles → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Victor Chen, M.D.Los Angeles, CA 900271588009583
- Chaddy ElhawaryLos Angeles, CA 900271154715514
- Luis Gomez Villalobos, M.D.Los Angeles, CA 900271205254224
- Josephine Haduong, M.D.Los Angeles, CA 900271780857573
- Sarah Javaherifar, MD, MPHLos Angeles, CA 900271528695939
- Sandra Kang, MDLos Angeles, CA 900271588051635
- Angad Rai, M.D.Los Angeles, CA 900271144654880
- Amandeep Singh, MDLos Angeles, CA 900271447418686
Common questions
What is Margaret Mou, D.O.'s NPI number?
Margaret Mou, D.O.'s National Provider Identifier (NPI) is 1679955306, issued on Jun 18, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Mou, D.O. located?
The NPPES record lists a practice address at 4650 W Sunset Blvd, Los Angeles, CA, 90027. Phone: (323) 660-2450. Providers update this record themselves, so call before visiting.
How can I verify Margaret Mou, D.O.'s license?
NPPES lists California license number 20A19116, 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.