James Armen Macer, MD
Obstetrics & Gynecology Physician · Pasadena, CA
James Armen Macer, MD is an obstetrics & gynecology physician with a practice address in Pasadena, California, and NPI 1134129711, issued on Jul 26, 2005. Check the license (California G42123, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Armen Macer
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G42123 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10 Congress St, Pasadena, CA 91105
- Phone
- (626) 449-6223
- Enumerated
- Jul 26, 2005
- Record last updated
- Jan 13, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (626) 449-0035
- Medicare enrollment
- Enrolled (PECOS I20110322000326); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1979
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 10 Congress St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Armen Macer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G42123Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.0 times the Medicare Part D claims of the average obstetrics & gynecology physician in 2024
662 Medicare Part D claims for 141 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol90 claims
- Estradiol (Twice Weekly)71 claims
- Premarin37 claims
- Progesterone37 claims
- Levothyroxine Sodium35 claims
- Synthroid26 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: $591.06
26 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. 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
- Macer MedicalRolling Hills Estates, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Armen Macer among 5,088 obstetrics & gynecology physician records in California
James Armen Macer, MD 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
- Graduated1979 · median 2004 among the 2,700 with a school on file
- Record last updated2011 · 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 Pasadena → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Ebenezer Ajilore, M.D.Pasadena, CA 911051891787537
- Jennie Chang, M.D.Pasadena, CA 911051982668422
- Della Fong, M.D.Pasadena, CA 911051700813359
- Melissa Grier, M.D.Pasadena, CA 911051861484420
- Wilbert Henneberg, MDPasadena, CA 911051265433155
- Bryan Jick, MDPasadena, CA 911051720051436
- Joseph Li, M.D.Pasadena, CA 911051770573941
- George Matsuda, MDPasadena, CA 911051144220815
Common questions
What is James Armen Macer, MD's NPI number?
James Armen Macer, MD's National Provider Identifier (NPI) is 1134129711, issued on Jul 26, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James Armen Macer, MD located?
The NPPES record lists a practice address at 10 Congress St, Pasadena, CA, 91105. Phone: (626) 449-6223. Providers update this record themselves, so call before visiting.
How can I verify James Armen Macer, MD's license?
NPPES lists California license number G42123, 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 Armen Macer, MD prescribe under Medicare Part D?
In 2024, James Armen Macer, MD had 662 Medicare Part D claims for 141 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.