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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

REGAN NICHOLE CASTELLANOS DNP, APRN, CPNP-AC
NPI 1427980374
Nurse Practitioner - Pediatrics, Critical Care in Houston, TX

Active since June 02, 2026
6411 FANNIN ST, HOUSTON, TX 77030(713) 704-5437 Get Directions Write a Review

NPPES record added: July 22, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 22, 2026, Jun 2, 2026 (2 updates tracked since 2026).

About Regan Nichole Castellanos Dnp, Aprn, Cpnp-ac NPPES

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

REGAN NICHOLE CASTELLANOS DNP, APRN, CPNP-AC (NPI 1427980374) is an individual pediatrics, critical care provider in Houston, Texas, licensed in Texas (1241673) and active in the NPI registry since June 2026.

NPPES Registry Identity

NPI1427980374
Entity TypeIndividualFemale
Primary Taxonomy363LP0222X
Provider Legal NameREGAN NICHOLE CASTELLANOSCredential: DNP, APRN, CPNP-AC
Location Address6411 FANNIN STHouston, TX 77030-1501
Mailing Address6410 Fannin St Ste 420Houston, TX 77030-3007 · (713) 486-5091 · Fax (713) 500-0702
Phone(713) 704-5437
Sole ProprietorNo
Enumeration DateJune 2, 2026
Last NPPES UpdateJuly 22, 20262 updates tracked since enumeration
NPPES CertifiedJuly 22, 2026
✔ NPI 1427980374 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Pediatrics, Critical CarePhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0222X
License✔ Licensed in TX · 1241673
6411 FANNIN ST, Houston, TX 77030
Open in Google Maps ↗

Other Names 1

Former Name (1)Regan Nichole Williams Dnp, Aprn, Cpnp-ac

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.

HASHIM ZAIDI M.D.
Emergency Medicine
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 500-7878
DAVID BALTRUSAITIS MD
Radiology (Diagnostic Radiology)
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 797-5929
CYNTHIA MARSHA DANIS RN
Registered Nurse (Critical Care Medicine)
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 704-4000
MR. MICHAEL KENNETH HOWZE JR.
Anesthesiologist Assistant
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 500-7160
STEPHEN M LARSON D.M.D.
Dentist (General Practice)
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 500-6200
STEPHEN G HECHT M.D.
Emergency Medicine
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 704-4060
VLADIMIR MELNIKOV M.D.
Anesthesiology
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 500-6200
MRS. CAROL JEAN UNDERWOOD BSN RN CCRC
Registered Nurse (Critical Care Medicine)
6411 FANNIN ST
HOUSTON, TX 77030
Harris County (713) 704-4230

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 Regan Castellanos's NPI number?

The NPI number for Regan Castellanos is 1427980374. It was assigned to this individual provider in the NPPES registry on June 2, 2026. The provider is also known as Regan Nichole Williams Dnp, Aprn, Cpnp-Ac.

Where is Regan Castellanos located?

Regan Castellanos practices at 6411 Fannin St, Houston, TX 77030. The listed phone number is (713) 704-5437.

What is Regan Castellanos's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Pediatrics, Critical Care, with taxonomy code 363LP0222X.

When was this NPI record last updated?

The NPPES record for Regan Castellanos was last updated on July 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 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.