GUSTAVO H DAY MD PA
NPI 1659559664
Internal Medicine in Dallas, TX

Q: What is Gustavo H Day MD PA's NPI number?

The NPI number for Gustavo H Day MD PA is 1659559664. It was assigned to this organization in the NPPES registry on February 1, 2008.

Q: What is Gustavo H Day MD PA's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since February 01, 2008

7777 FOREST LN, BUILDING B, SUITE 416, DALLAS, TX 75230(972) 566-6764(972) 566-6968 Get Directions Write a Review

NPPES record last updated: May 18, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: May 18, 2026, Apr 12, 2024 (2 updates tracked since 2024).

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About Gustavo H Day Md Pa NPPES

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

GUSTAVO H DAY MD PA (NPI 1659559664) is a healthcare organization registered as an internal medicine in Dallas, Texas and active in the NPI registry since February 2008. The organization lists Gustavo Horacio Day, Owner, as its authorized official.

NPPES Registry Identity

NPI1659559664

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameGUSTAVO H DAY MD PA

Location Address7777 FOREST LN, BUILDING B, SUITE 416Dallas, TX 75230-2505

Mailing AddressPo Box 738305Dallas, TX 75373-8305 · (972) 566-6764 · Fax (972) 566-6968

Phone(972) 566-6764

Fax(972) 566-6968

Organization SubpartNo

Authorized OfficialGustavo Horacio DayOwner · (972) 566-6764

Enumeration DateFebruary 1, 2008

Last NPPES UpdateMay 18, 20262 updates tracked since enumeration

NPPES CertifiedMay 18, 2026

✔ NPI 1659559664 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

7777 FOREST LN, Dallas, TX 75230

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Other Identifiers 1

MedicaidP00040AM6TX

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

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.

JEFFREY SZOT M.D.

Emergency Medicine

7777 FOREST LN
DALLAS, TX 75230

Dallas County (972) 566-2667

NORTH DALLAS ORTHOPEDICS & REHABILITATION, PA

Clinic/Center

7777 FOREST LN, C-500
DALLAS, TX 75230

Dallas County (972) 566-6366

KASEY REHME

Speech-Language Pathologist

7777 FOREST LN
DALLAS, TX 75230

Dallas County (972) 566-7000

DR. CHRISTIAN BREWER MD

Emergency Medicine

7777 FOREST LN
DALLAS, TX 75230

Dallas County (972) 566-7000

JEFFREY L. HORSWELL, MD PA

Anesthesiology

7777 FOREST LN
DALLAS, TX 75230

Dallas County (972) 247-9946

MRS. AMELIE P. MCKNEELY PA-C

Physician Assistant (Surgical)

7777 FOREST LN
DALLAS, TX 75230

Dallas County (972) 566-7000

MRS. SUSAN KAY DEAHL M.C.D.

Audiologist-Hearing Aid Fitter

7777 FOREST LN, BUILDING C SUITE 100
DALLAS, TX 75230

Dallas County (972) 566-4848

360 ANESTHESIA, PA

Anesthesiology

7777 FOREST LN
DALLAS, TX 75230

Dallas County (972) 566-4817

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 Gustavo H Day MD PA's NPI number?

The NPI number for Gustavo H Day MD PA is 1659559664. It was assigned to this organization in the NPPES registry on February 1, 2008.

Where is Gustavo H Day MD PA located?

Gustavo H Day MD PA is located at 7777 Forest Ln Building B, Suite 416, Dallas, TX 75230. The listed phone number is (972) 566-6764.

What is Gustavo H Day MD PA's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

What insurance does Gustavo H Day MD PA accept?

Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 1 other insurer list Gustavo H Day MD PA as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Gustavo H Day MD PA was last updated on May 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.