Cynthia W. Chao, DO A PROFESSIONAL CO
Obstetrics & Gynecology Physician · Los Alamitos, CA
Cynthia W. Chao, DO A PROFESSIONAL CO is an obstetrics & gynecology physician with a practice address in Los Alamitos, California, and NPI 1720077274, issued on Oct 18, 2005. Check the license (California 20A7343, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cynthia W. Chao
- Credential
- DO A PROFESSIONAL CO
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 20A7343 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10861 Cherry St Ste 109, Los Alamitos, CA 90720
- Phone
- (562) 931-3137
- Enumerated
- Oct 18, 2005
- Record last updated
- Apr 20, 2024
- Medicaid ID
- 00AX73430 CA
- Medicare enrollment
- Enrolled (PECOS I20101207001216); accepts Medicare assignment
- Medical or professional school
- Western University Of Health Sciences College Of Dental Med, 1997
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Verify Cynthia W. Chao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A7343Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
103 Medicare Part D claims for 49 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol48 claims
- Alendronate Sodium12 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: $121.83
1 payment: food and beverage; the largest payer was Genzyme Corporation. 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
- The Roads Foundation, IncCompton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cynthia W. Chao among 5,088 obstetrics & gynecology physician records in California
Cynthia W. Chao, DO A PROFESSIONAL CO 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1997 · median 2004 among the 2,700 with a school on file
- Record last updated2024 · 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).
14 obstetrics & gynecology physician records list a practice address in Los Alamitos
They are 14 of the 1,035 NPPES records with a practice address in Los Alamitos, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Los Alamitos → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Virginia Agnelli, M.D.Los Alamitos, CA 907201982643763
- Andrew Awadalla, MDLos Alamitos, CA 907201548503246
- Allyson Davis, M.D.Los Alamitos, CA 907201255570198
- James Ger, M.D.Los Alamitos, CA 907201598725368
- Nancy Kimber, M.D.Los Alamitos, CA 907201699789792
- Joel Kizner, M.D.Los Alamitos, CA 907201134139751
- Karen Koe, MDLos Alamitos, CA 907201780648709
- Helen Mahoney, MDLos Alamitos, CA 907201922104512
Common questions
What is Cynthia W. Chao, DO A PROFESSIONAL CO's NPI number?
Cynthia W. Chao, DO A PROFESSIONAL CO's National Provider Identifier (NPI) is 1720077274, issued on Oct 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia W. Chao, DO A PROFESSIONAL CO located?
The NPPES record lists a practice address at 10861 Cherry St Ste 109, Los Alamitos, CA, 90720. Phone: (562) 931-3137. Providers update this record themselves, so call before visiting.
How can I verify Cynthia W. Chao, DO A PROFESSIONAL CO's license?
NPPES lists California license number 20A7343, 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 Cynthia W. Chao, DO A PROFESSIONAL CO prescribe under Medicare Part D?
In 2024, Cynthia W. Chao, DO A PROFESSIONAL CO had 103 Medicare Part D claims for 49 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.