John O'Brien, PHARM.D.
NPI 1336551779 · Pharmacist · Maricopa, AZ
John O'Brien, PHARM.D. is a Pharmacist provider in Maricopa, AZ (NPI 1336551779).
Provider details
- NPI number
- 1336551779
- Entity type
- Individual
- Primary specialty
- PharmacistPharmacy Service Providers
- Credential
- PHARM.D.
- Sex
- Male
- Sole proprietor
- No
- License
- S019906 (AZ)
Specialties & taxonomies
Pharmacy Service Providers
Pharmacy Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Varicella-Zoster Ge/As01b/Pfbrand: Shingrix | 63 | 56 |
| Rsvpref3 Antigen/As01e/Pfbrand: Arexvy | 61 | 61 |
| Diphth,pertuss(acell),tet Vacbrand: Boostrix Tdap | 14 | 14 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-05-20
- Last updated
- 2014-05-20
Frequently asked questions
- What is John O'Brien's NPI number?
- John O'Brien's National Provider Identifier (NPI) is 1336551779, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John O'Brien's specialty?
- John O'Brien is listed in the NPPES registry with a primary specialty of Pharmacist (Pharmacy Service Providers).
- Where is John O'Brien located?
- John O'Brien's practice location on file with NPPES is 44274 W Smith Enke Rd, Maricopa, AZ 85138-2719.
- What is John O'Brien's phone number?
- The practice phone number listed in the NPPES registry for John O'Brien is (520) 568-8290.
- Is John O'Brien's NPI active?
- Yes — John O'Brien's NPI (1336551779) is active in the NPPES registry as of the last update on 2014-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.