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Family Practice

Theresa A. Day, MD

Works at hospitals in Houston, TX · Texas

Summary

Dr. Theresa A. Day, MD is a family doctor at 4710 Bellaire Blvd, Bellaire, TX 77401. Phone: (713) 363-9411. Accepts Medicare assignment. In 2024, Theresa A. Day had 14 Original Medicare patients and 42 services. NPI 1881072007. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

  • Specialty: Family doctor (Medicare lists Family Practice)
  • Address: 4710 Bellaire Blvd, Bellaire, TX 77401 · Directions (5 more locations)
  • Phone: (713) 363‑9411
  • Medicare: Accepts Medicare assignment
  • Hospital: Houston Methodist Hospital
  • Group practice: TMH Physician Associates PLLC (+1 more)
  • Medical school: University Of Arizona College Of Medicine · graduated 2015 (11 years since medical school)
  • Gender (as listed): Female
  • Telehealth: offered

From official Medicare data

This page shows what Medicare's official clinician data says about Theresa A. Day, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Theresa A. Day accept Medicare assignment?
Yes. Medicare's clinician data says Theresa A. Day accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
How many Medicare patients does Theresa A. Day see?
In 2024, CMS data shows 14 Original Medicare patients and 42 services for Theresa A. Day. This counts Original Medicare only and measures volume, not quality.
What is Theresa A. Day's NPI number?
1881072007. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Medicare activity in 2024

Official CMS public-use data for Theresa A. Day, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Original Medicare patients14
Services billed to Medicare42
Different services or procedures14
Participating Medicare providerYes
Average age of these patients78

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

  • High blood pressure75%
  • High cholesterol75%

Hospitals where Theresa A. Day works

Medicare's Facility Affiliation Data lists Theresa A. Day at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

Practice locations

Addresses where Theresa A. Day is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

  • 4710 Bellaire BlvdBellaire, TX 77401 (713) 363‑9411
  • 6445 Main St, Suite 2500Houston, TX 77030 (713) 441‑3150
  • 6565 Fannin StHouston, TX 77030
  • 6565 Fannin St, Suite 520Houston, TX 77030
  • 6565 Fannin St Main, 577 Methodist Acad Med AssocHouston, TX 77030 (713) 441‑0428

Group practices

Medicare enrollment lists Theresa A. Day as a member of these groups (CMS data updated October 2, 2026).

  • TMH Physician Associates PLLC1,690 clinicians in the group
  • Houston Methodist Specialty Physicians1,528 clinicians in the group

Specialties

Find other Family Practice doctors in Texas →

Other family doctors in Bellaire

Clinicians with the same Medicare primary specialty in Bellaire, TX — not a recommendation.

All family doctors in Bellaire →

Other clinicians in TMH Physician Associates PLLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolUniversity Of Arizona College Of Medicine
Graduation year2015 (11 years since medical school)
Gender (as listed)Female
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1881072007
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians