John Henry O'Brien, PHARM.D.
Pharmacist · Maricopa, AZ
John Henry O'Brien, PHARM.D. is a pharmacist with a practice address in Maricopa, Arizona, and NPI 1336551779, issued on May 20, 2014. Check the license (Arizona S019906, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Henry O'Brien
- Credential
- PHARM.D.
- Primary taxonomy
- Pharmacist 183500000X
- License numbers
- S019906 AZ
PS51639 FL
Self-reported in NPPES; status is on the state search - Practice location
- 44274 W Smith Enke RD, Maricopa, AZ 85138
- Phone
- (520) 568-8290
- Enumerated
- May 20, 2014
- Record last updated
- May 20, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (520) 568-8296
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 6,746 in Arizona → Look up another NPI →
Verify John Henry O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license S019906Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 97% of the cost of the top drugs
156 Medicare Part D claims for 129 beneficiaries, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D. Brand-name drugs were 99% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Shingrix63 claims
- Arexvy61 claims
- Boostrix Tdap14 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.
John Henry O'Brien among 6,746 pharmacist records in Arizona
John Henry O'Brien, PHARM.D. is one of 6,746 pharmacist records with a practice address in Arizona. 27% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 44% of them.
- NPI issued2014 · 44% of these records are older, 45% newer
- In a Medicare fileYes · 27% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2014 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 183500000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 pharmacist records list a practice address in Maricopa
They are 19 of the 437 NPPES records with a practice address in Maricopa, and 6,746 pharmacist records in Arizona.
All 6,746 in Arizona → Every provider in Maricopa → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Mary Daniel-RzayevMaricopa, AZ 851381083253330
- Timothy Oxley, RPHMaricopa, AZ 851381730594813
- Theresa ShibilskiMaricopa, AZ 851381376090324
- Desiree TilburyMaricopa, AZ 851381780099846
- Kim Yen Tran, PHARMDMaricopa, AZ 851381568910115
- Douglas UrbaniakMaricopa, AZ 851381093127086
- Peter Hendrickson, RPHMaricopa, AZ 851391972833002
- Ronny KasseesMaricopa, AZ 851391437480464
Common questions
What is John Henry O'Brien, PHARM.D.'s NPI number?
John Henry O'Brien, PHARM.D.'s National Provider Identifier (NPI) is 1336551779, issued on May 20, 2014. An NPI identifies a provider in billing; it is not a license.
Where is John Henry O'Brien, PHARM.D. located?
The NPPES record lists a practice address at 44274 W Smith Enke RD, Maricopa, AZ, 85138. Phone: (520) 568-8290. Providers update this record themselves, so call before visiting.
How can I verify John Henry O'Brien, PHARM.D.'s license?
NPPES lists Arizona license number S019906, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does John Henry O'Brien, PHARM.D. prescribe under Medicare Part D?
In 2024, John Henry O'Brien, PHARM.D. had 156 Medicare Part D claims for 129 beneficiaries; the average among pharmacist prescribers was 119. 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.