Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. WILLIAM FRANCIS O'BRIEN M.D.
NPI 1700860558
Obstetrics & Gynecology - Maternal & Fetal Medicine in Fort Myers, FL

Q: What is William O'brien's NPI number?

The NPI number for William O'brien is 1700860558. It was assigned to this individual provider in the NPPES registry on December 5, 2005.

Q: What is William O'brien's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

Q: When was this NPI record last updated?

The NPPES record for William O'brien was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 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.

Active since December 05, 2005

9981 HEALTHPARK CR, SUITE 159, FORT MYERS, FL 33908(239) 481-5477(239) 481-5892 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. William Francis O'brien M.d. NPPES

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

DR. WILLIAM FRANCIS O'BRIEN M.D. (NPI 1700860558) is an individual maternal & fetal medicine provider in Fort Myers, Florida, licensed in Florida (ME42212) and active in the NPI registry since December 2005.

NPPES Registry Identity

NPI1700860558

Entity TypeIndividualMale

Primary Taxonomy207VM0101X

Provider Legal NameDR. WILLIAM FRANCIS O'BRIENCredential: M.D.

Location Address9981 HEALTHPARK CR, SUITE 159Fort Myers, FL 33908

Mailing Address9981 Healthpark Cr, Suite 159Fort Myers, FL 33908 · (239) 481-5477 · Fax (239) 481-5892

Phone(239) 481-5477

Fax(239) 481-5892

Sole ProprietorNo

Enumeration DateDecember 5, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1700860558 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · Maternal & Fetal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207VM0101X

License✔ Licensed in FL · ME42212

Definition

An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies.

9981 HEALTHPARK CR, Fort Myers, FL 33908

Open in Google Maps ↗

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 William O'brien's NPI number?

The NPI number for William O'brien is 1700860558. It was assigned to this individual provider in the NPPES registry on December 5, 2005.

Where is William O'brien located?

William O'brien practices at 9981 Healthpark Cr Suite 159, Fort Myers, FL 33908. The listed phone number is (239) 481-5477.

What is William O'brien's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

When was this NPI record last updated?

The NPPES record for William O'brien was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 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.