James Helfrich McMillan, M.D.
Obstetrics & Gynecology Physician · Lancaster, CA
James Helfrich McMillan, M.D. is an obstetrics & gynecology physician with a practice address in Lancaster, California, and NPI 1245236025, issued on Jun 25, 2005. Check the license (California G33601, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Helfrich McMillan
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G33601 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 W Avenue J, Lancaster, CA 93534
- Phone
- (661) 949-5000
- Enumerated
- Jun 25, 2005
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 130790 AR
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1600 W Avenue J
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sam Abid, PHARM.D.Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1295366656
- Hazem Aboaid, MDInternal Medicine Physician1689323552
- Beverly Kim AgniPsychiatric/Mental Health Registered Nurse1194542761
- Josephine Aideloje, NPPsychiatric/Mental Health Nurse Practitioner1790272243
- Imaobong AliyuAdult Psychiatric/Mental Health Registered Nurse1497343206
- Sam Allen, MDObstetrics & Gynecology Physician1982740841
Verify James Helfrich McMillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G33601Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
12 Medicare Part D claims, 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.
James Helfrich McMillan among 5,088 obstetrics & gynecology physician records in California
James Helfrich McMillan, 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 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 fileNo · 53% of these records are
- Record last updated2007 · 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 Lancaster → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Sam Allen, MDLancaster, CA 935341982740841
- Herminia Amezcua, MDLancaster, CA 935341326282385
- Katrina Baker, MDLancaster, CA 935341538154836
- John Birsner, MDLancaster, CA 935341457443525
- Oluwamuyiwa Bolonduro, M.DLancaster, CA 935341215216965
- Suzanne Chaudhry, M.D.Lancaster, CA 935341730223066
- Alex Danso, MDLancaster, CA 935341972611655
- Jackson Fu, MDLancaster, CA 935341871581637
Common questions
What is James Helfrich McMillan, M.D.'s NPI number?
James Helfrich McMillan, M.D.'s National Provider Identifier (NPI) is 1245236025, issued on Jun 25, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James Helfrich McMillan, M.D. located?
The NPPES record lists a practice address at 1600 W Avenue J, Lancaster, CA, 93534. Phone: (661) 949-5000. Providers update this record themselves, so call before visiting.
How can I verify James Helfrich McMillan, M.D.'s license?
NPPES lists California license number G33601, 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 James Helfrich McMillan, M.D. prescribe under Medicare Part D?
In 2024, James Helfrich McMillan, M.D. had 12 Medicare Part D claims; 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.