Karen Hsu, MD
Obstetrics & Gynecology Physician · Orange, CA
Karen Hsu, MD is an obstetrics & gynecology physician with a practice address in Orange, California, and NPI 1659733459, issued on Mar 22, 2016. Check the license (California A170534, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Hsu
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A170534 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2501 E Chapman Ave Ste 201-202, Orange, CA 92869
- Phone
- (714) 282-1892
- Enumerated
- Mar 22, 2016
- Record last updated
- Dec 1, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20201208002766); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 2501 E Chapman Ave Ste 201-202
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gelareh Nikpour-Heravi, M.D.Obstetrics & Gynecology Physician1013302876
Verify Karen Hsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A170534Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
132 Medicare Part D claims for 52 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Estradiol23 claims
- Clobetasol Propionate14 claims
- Dotti13 claims
- Progesterone13 claims
- Misoprostol11 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: $979.42
5 payments; by number, the most common kind was travel and lodging; the largest payer was Intuitive Surgical, Inc. The 21,429 providers of this specialty with any payment received $1,030.61 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
- Providence Medical FoundationOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Hsu among 5,088 obstetrics & gynecology physician records in California
Karen Hsu, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 85% of them.
- NPI issued2016 · 85% of these records are older, 13% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2016 · median 2004 among the 2,700 with a school on file
- Record last updated2020 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Orange → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Shruti Dasgupta, MDOrange, CA 928691023647138
- Daniel Dobalian, M.D.Orange, CA 928691578743894
- Jesus Hernandez, M.D.Orange, CA 928691609865716
- Shannon Kiss, DOOrange, CA 928691831830629
- Helena NguyenOrange, CA 928691124760079
- Gelareh Nikpour-Heravi, M.D.Orange, CA 928691013302876
- Danielle Ogez, M.D.Orange, CA 928691407201049
- Alfred Tay, M.D.Orange, CA 928691629202189
Common questions
What is Karen Hsu, MD's NPI number?
Karen Hsu, MD's National Provider Identifier (NPI) is 1659733459, issued on Mar 22, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Karen Hsu, MD located?
The NPPES record lists a practice address at 2501 E Chapman Ave Ste 201-202, Orange, CA, 92869. Phone: (714) 282-1892. Providers update this record themselves, so call before visiting.
How can I verify Karen Hsu, MD's license?
NPPES lists California license number A170534, 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 Karen Hsu, MD prescribe under Medicare Part D?
In 2024, Karen Hsu, MD had 132 Medicare Part D claims for 52 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.