Joan T. Sasaki, M.D.
Obstetrics & Gynecology Physician · Mission Viejo, CA
Joan T. Sasaki, M.D. is an obstetrics & gynecology physician with a practice address in Mission Viejo, California, and NPI 1013940535, issued on Jul 8, 2006. Check the license (California G66772, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joan T. Sasaki
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G66772 CA
Self-reported in NPPES; status is on the state search - Practice location
- 26691 Plaza, Mission Viejo, CA 92691
- Phone
- (949) 441-5556
- Enumerated
- Jul 8, 2006
- Record last updated
- Feb 10, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (949) 348-2523
- Medicare enrollment
- Enrolled (PECOS I20060816000509); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 26691 Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rachel BunettaPhysical Therapy Assistant1366144354
- Arpi MelkonianPsychologist1952489155
- Viken Melkonian, M.D.Specialist1932154721
- George Miranda, MDHematology & Oncology Physician1558545038
- Lloyd Nagasawa, M.D.Hematology & Oncology Physician1487647335
- Fred Nour, MDNeurology Physician1881629350
Verify Joan T. Sasaki in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G66772Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
19 Medicare Part D claims for 13 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
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: $29.91
1 payment: food and beverage; the largest payer was Organon Llc. 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
- Magella Medical Group IncTorrance, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joan T. Sasaki among 5,088 obstetrics & gynecology physician records in California
Joan T. Sasaki, M.D. 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2001 · median 2004 among the 2,700 with a school on file
- Record last updated2014 · 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).
21 obstetrics & gynecology physician records list a practice address in Mission Viejo
They are 21 of the 2,156 NPPES records with a practice address in Mission Viejo, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Mission Viejo → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Leon Baginski, MDMission Viejo, CA 926911487602702
- Thomas Bailey, MDMission Viejo, CA 926911598714818
- Jerry Benzl, MDMission Viejo, CA 926911740398148
- Scott Capobianco, MDMission Viejo, CA 926911275582066
- Kathryn Cvar, MDMission Viejo, CA 926911952350282
- Heba Farag, MDMission Viejo, CA 926911568496735
- Rasha Hashad, MDMission Viejo, CA 926911396794632
- Kenneth James, M.D.Mission Viejo, CA 926911497782213
Common questions
What is Joan T. Sasaki, M.D.'s NPI number?
Joan T. Sasaki, M.D.'s National Provider Identifier (NPI) is 1013940535, issued on Jul 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joan T. Sasaki, M.D. located?
The NPPES record lists a practice address at 26691 Plaza, Mission Viejo, CA, 92691. Phone: (949) 441-5556. Providers update this record themselves, so call before visiting.
How can I verify Joan T. Sasaki, M.D.'s license?
NPPES lists California license number G66772, 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 Joan T. Sasaki, M.D. prescribe under Medicare Part D?
In 2024, Joan T. Sasaki, M.D. had 19 Medicare Part D claims for 13 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.