Ralph Bernard Armstrong, DO
Obstetrics & Gynecology Physician · Hollister, CA
Ralph Bernard Armstrong, DO is an obstetrics & gynecology physician with a practice address in Hollister, California, and NPI 1477526028, issued on Feb 13, 2006. Check the license (California 20A9256, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ralph Bernard Armstrong
- Credential
- DO
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 20A9256 CA
Self-reported in NPPES; status is on the state search - Practice location
- 931 Sunset Dr, Hollister, CA 95023
- Phone
- (831) 635-0604
- Enumerated
- Feb 13, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (831) 665-5750
- Medicaid ID
- 00AX92560 CA
- Medicare enrollment
- Enrolled (PECOS I20051208000552); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Verify Ralph Bernard Armstrong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A9256Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
167 Medicare Part D claims for 45 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Estradiol12 claims
- Valacyclovir12 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: $171.77
13 payments; by number, the most common kind was food and beverage; the largest payer was Mayne Pharma Commercial 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
- Obstetrix Medical Group OF California A Professional CorporationSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ralph Bernard Armstrong among 5,088 obstetrics & gynecology physician records in California
Ralph Bernard Armstrong, DO 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 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 Hollister → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Zarin Amin, DOHollister, CA 950231093971889
- Mohammad Barra, MDHollister, CA 950231962501635
- Parviz Tabibian, MDHollister, CA 950231588775522
- Jumnah Arasu, M.D., F.A.C.O.G.Gilroy, CA 950201790824878
- Kari Bertrand, M.D.Gilroy, CA 950201285744615
- Pamela Edillon, MDGilroy, CA 950201184702680
- Michael H Dez, MDGilroy, CA 950201942386446
- Ali Hoda, MDGilroy, CA 950201700959475
Common questions
What is Ralph Bernard Armstrong, DO's NPI number?
Ralph Bernard Armstrong, DO's National Provider Identifier (NPI) is 1477526028, issued on Feb 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ralph Bernard Armstrong, DO located?
The NPPES record lists a practice address at 931 Sunset Dr, Hollister, CA, 95023. Phone: (831) 635-0604. Providers update this record themselves, so call before visiting.
How can I verify Ralph Bernard Armstrong, DO's license?
NPPES lists California license number 20A9256, 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 Ralph Bernard Armstrong, DO prescribe under Medicare Part D?
In 2024, Ralph Bernard Armstrong, DO had 167 Medicare Part D claims for 45 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.