1. Home
  2. Directory
  3. California
  4. South San Francisco
  5. Pharmacist
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GREGORY NELSON HAYNER PHARM.D.
NPI 1578634721
Pharmacist - Pharmacotherapy in South San Francisco, CA

Active since November 10, 2006
1200 EL CAMINO REAL, SOUTH SAN FRANCISCO, CA 94080(650) 742-7242(650) 742-7254 Get Directions Write a Review

NPPES record last updated: August 16, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Gregory Nelson Hayner Pharm.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY NELSON HAYNER PHARM.D. (NPI 1578634721) is an individual pharmacotherapy provider in South San Francisco, California, licensed in California (RPH31416) and active in the NPI registry since November 2006.

NPPES Registry Identity

NPI1578634721
Entity TypeIndividualMale
Primary Taxonomy1835P1200X
Provider Legal NameDR. GREGORY NELSON HAYNERCredential: PHARM.D.
Location Address1200 EL CAMINO REALSouth San Francisco, CA 94080-3208
Mailing Address1200 El Camino RealSouth San Francisco, CA 94080-3208 · (650) 742-7242 · Fax (650) 742-7254
Phone(650) 742-7242
Fax(650) 742-7254
Sole ProprietorNo
Enumeration DateNovember 10, 2006
Last NPPES UpdateAugust 16, 2026
✔ NPI 1578634721 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPharmacist · PharmacotherapyPharmacy Service Providers
Taxonomy Code1835P1200X
License✔ Licensed in CA · RPH31416
Definition
A licensed pharmacist who has demonstrated specialized knowledge and skill in optimizing pharmacotherapeutic care of patients, by developing, implementing, monitoring, and modifying complex treatment plans, providing advanced level education and consultation, and collaborating with other health professionals in the management of therapy.
1200 EL CAMINO REAL, South San Francisco, CA 94080
Open in Google Maps ↗

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SANDRA MOONHEE LEE PHARM. D.
Pharmacist
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2627
MELISSA ARGENTE RT
Respiratory Therapist, Registered
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-3313
DR. JAMES NICHOLAS PEROS MD
Internal Medicine
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2000
DR. PIERSON CHIOU M.D.
Radiology (Diagnostic Radiology)
1200 EL CAMINO REAL, 1ST FLOOR, DEPARTMENT OF RADIOLOGY
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-3882
MS. LARELL LOUISE FINEREN CRNA
Nurse Anesthetist, Certified Registered
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-3037
EDMOND L. SCHMULBACH MD
Internal Medicine (Hematology & Oncology)
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2000
EDWARD J. BADDOUR MD
Emergency Medicine
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2000
ESTHER KOESHADI PHARM.D.
Pharmacist
1200 EL CAMINO REAL, KAISER PERMANENTE INPATIENT PHARMACY 3RD FLOOR
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2486

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Hayner's NPI number?

The NPI number for Gregory Hayner is 1578634721. It was assigned to this individual provider in the NPPES registry on November 10, 2006.

Where is Gregory Hayner located?

Gregory Hayner practices at 1200 El Camino Real, South San Francisco, CA 94080. The listed phone number is (650) 742-7242.

What is Gregory Hayner's specialty?

The primary specialty registered for this NPI is Pharmacist, specializing in Pharmacotherapy, with taxonomy code 1835P1200X.

When was this NPI record last updated?

The NPPES record for Gregory Hayner was last updated on August 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.