GUSTAVO HORACIO DAY M.D.
NPI 1538239173
Internal Medicine in Dallas, TX
About Gustavo Horacio Day M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GUSTAVO HORACIO DAY M.D. (NPI 1538239173) is an individual internal medicine provider in Dallas, Texas, licensed in Texas (K1411) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through January 25, 2028, and is affiliated with Medical City Dallas Hospital.
NPPES Registry Identity
Specialties & Licenses
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.
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Gustavo Horacio Day M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 45D0925197
Gustavo H Day MD · Dallas, TXAreas of Expertise CMS Part B claims 48
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Medical City Dallas Hospital
Acute Care Hospitals · Dallas, TXMedical City Plano
Acute Care Hospitals · Plano, TXMedical City Lewisville
Acute Care Hospitals · Lewisville, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 75230 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 9
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
DALLAS, TX 75230
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 Day's NPI number?
The NPI number for Gustavo Day is 1538239173. It was assigned to this individual provider in the NPPES registry on November 9, 2006.
Where is Gustavo Day located?
Gustavo Day practices at 7777 Forest Ln Building B, Suite416, Dallas, TX 75230. The listed phone number is (972) 566-6764.
What is Gustavo Day's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Gustavo Day enrolled in Medicare?
Yes. Gustavo Day is registered in the Medicare PECOS enrollment system.
Does Gustavo Day hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 45D0925197) is associated with this NPI, valid through January 25, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does Gustavo Day 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 3 other insurers list Gustavo Day 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.
Is Gustavo Day affiliated with any hospitals?
According to CMS data, Gustavo Day is affiliated with Medical City Dallas Hospital, Medical City Plano and Medical City Lewisville.
When was this NPI record last updated?
The NPPES record for Gustavo Day was last updated on May 18, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.