Don J. Nishiguchi, M.D.
Obstetrics Physician · Valencia, CA
Don J. Nishiguchi, M.D. is an obstetrics physician with a practice address in Valencia, California, and NPI 1043368277, issued on Jan 5, 2007. Check the license (California G055628, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Don J. Nishiguchi
- Credential
- M.D.
- Primary taxonomy
- Obstetrics Physician 207VX0000X
- License number
- G055628 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27871 Smyth Dr, Valencia, CA 91355
- Phone
- (661) 259-1781
- Enumerated
- Jan 5, 2007
- Record last updated
- Oct 26, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (661) 259-4571
- Medicare enrollment
- Enrolled (PECOS I20101022000348); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest obstetrics physician records → All 174 in California → Look up another NPI →
Also registered at 27871 Smyth Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Cecelia Hann, M.D.Obstetrics & Gynecology Physician1629125075
Verify Don J. Nishiguchi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G055628Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
About as many Medicare Part D claims as the average obstetrics physician in 2024
218 Medicare Part D claims for 81 beneficiaries, against an average of 218 among the 863 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol48 claims
- Progesterone32 claims
- Valacyclovir30 claims
- Clotrimazole-Betamethasone19 claims
- Cephalexin12 claims
- Fluconazole12 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: $166.12
8 payments; by number, the most common kind was food and beverage; the largest payer was Exeltis, USA Inc. The 679 providers of this specialty with any payment received $826.19 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 2 group practices
- Henry Mayo Newhall Clinics LLCValencia, CA
- Scct Medical Group PCValencia, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Don J. Nishiguchi among 174 obstetrics physician records in California
Don J. Nishiguchi, M.D. is one of 174 obstetrics physician records with a practice address in California. 67% 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 44% of them.
- NPI issued2007 · 44% of these records are older, 39% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated1980 · median 2002 among the 91 with a school on file
- Record last updated2007 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VX0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics Physician providers in California
There are 174 obstetrics physician records in California.
All 174 in California → Every provider in Valencia → Obstetrics Physician nationwide →
The 8 obstetrics physician records with the nearest ZIP codes
- Maryam Ardalan, MDSanta Clarita, CA 913551396936217
- Ming-Kong Chen, M.D.Valencia, CA 913551316276942
- Rebecca Perlow, D.O.Tarzana, CA 913561346235157
- Robert Grossman, MDThousand Oaks, CA 913201053462606
- Joie Russo, M.D.Encino, CA 913161619988532
- Payman Joseph, M.D.Van Nuys, CA 914051184736589
- Richard Friedman, M.D.Burbank, CA 915051285641837
- Cesar Caldera, M.DGlendale, CA 912041912010778
Common questions
What is Don J. Nishiguchi, M.D.'s NPI number?
Don J. Nishiguchi, M.D.'s National Provider Identifier (NPI) is 1043368277, issued on Jan 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Don J. Nishiguchi, M.D. located?
The NPPES record lists a practice address at 27871 Smyth Dr, Valencia, CA, 91355. Phone: (661) 259-1781. Providers update this record themselves, so call before visiting.
How can I verify Don J. Nishiguchi, M.D.'s license?
NPPES lists California license number G055628, 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 Don J. Nishiguchi, M.D. prescribe under Medicare Part D?
In 2024, Don J. Nishiguchi, M.D. had 218 Medicare Part D claims for 81 beneficiaries; the average among obstetrics physician prescribers was 218. 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.