Denise Akimi Ishimaru, M.D.
Obstetrics & Gynecology Physician · Torrance, CA
Denise Akimi Ishimaru, M.D. is an obstetrics & gynecology physician with a practice address in Torrance, California, and NPI 1225219066, issued on Nov 20, 2007. Check the license (California A92469, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Denise Akimi Ishimaru
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A92469 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20911 Earl St, Torrance, CA 90503
- Phone
- (310) 540-9600
- Enumerated
- Nov 20, 2007
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (310) 540-6282
- Medicare enrollment
- Enrolled (PECOS I20081210000440); 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 20911 Earl St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Denise Akimi Ishimaru in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A92469Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
105 Medicare Part D claims for 33 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
- Estradiol25 claims
- Alendronate Sodium23 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.
Bills Medicare through one group practice
- Providence Medical InstituteLaguna Niguel, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Denise Akimi Ishimaru among 5,088 obstetrics & gynecology physician records in California
Denise Akimi Ishimaru, 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 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 38% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2004 · median 2004 among the 2,700 with a school on file
- Record last updated2021 · 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 Torrance → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Jeffrey Cowan, M.D.Torrance, CA 905031982618500
- Stephanie Culver, MDTorrance, CA 905031386758399
- Lisa Fisher, M.D.Torrance, CA 905031285665810
- Martha Hynes, M.D.Torrance, CA 905031801800750
- Francine Ito, M.D.Torrance, CA 905031275562993
- John Lim, M.D.Torrance, CA 905031508899493
- David Lu, MDTorrance, CA 905031255515417
- Astrid Mendoza, D.OTorrance, CA 905031871536797
Common questions
What is Denise Akimi Ishimaru, M.D.'s NPI number?
Denise Akimi Ishimaru, M.D.'s National Provider Identifier (NPI) is 1225219066, issued on Nov 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Denise Akimi Ishimaru, M.D. located?
The NPPES record lists a practice address at 20911 Earl St, Torrance, CA, 90503. Phone: (310) 540-9600. Providers update this record themselves, so call before visiting.
How can I verify Denise Akimi Ishimaru, M.D.'s license?
NPPES lists California license number A92469, 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 Denise Akimi Ishimaru, M.D. prescribe under Medicare Part D?
In 2024, Denise Akimi Ishimaru, M.D. had 105 Medicare Part D claims for 33 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.