NPPES file of Aug 9, 2026

Theresa Ann Day, M.D.

Geriatric Medicine (Family Medicine) Physician · Houston, TX

Theresa Ann Day, M.D. is a geriatric medicine (family medicine) physician with a practice address in Houston, Texas, and NPI 1881072007, issued on May 7, 2015. Check the license (Texas U1177, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1881072007
Name
Theresa Ann Day
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Family Medicine) Physician 207QG0300X
License number
U1177 TX
Self-reported in NPPES; status is on the state search
Practice location
6550 Fannin St, Houston, TX 77030
Phone
(346) 238-7003
Enumerated
May 7, 2015
Record last updated
Jul 31, 2026
Medicare enrollment
Enrolled (PECOS I20230120001075); accepts Medicare assignment
Medical or professional school
University Of Arizona College Of Medicine, 2015
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (family medicine) physician records → All 121 in Texas → Look up another NPI →

Also registered at 6550 Fannin St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Bincy Abraham, MDGastroenterology Physician1578767166
  2. Horacio Adrogue, MDNephrology Physician1508958000
  3. Talha Akram, MDStudent in an Organized Health Care Education/Training Program1346180577
  4. Mahmoud Al Rifai, M.D.Cardiovascular Disease Physician1922456219
  5. Jaden Aland, MDStudent in an Organized Health Care Education/Training Program1114868213
  6. James Albright, MDPediatric Otolaryngology Physician1548255805

Verify Theresa Ann Day in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersTexas Medical Board
    Search for license U1177    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Texas license search

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63% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024

1,920 Medicare Part D claims for 371 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 26 claims were for opioids.

  1. Theresa Day1,920
  2. Specialty average5,222

Most prescribed

  1. Atorvastatin Calcium121 claims
  2. Rosuvastatin Calcium75 claims
  3. Amlodipine Besylate67 claims
  4. Gabapentin63 claims
  5. Lisinopril63 claims
  6. Ozempic50 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $29.41

1 payment: food and beverage; the largest payer was Exact Sciences Corporation. The 460 providers of this specialty with any payment received $1,218.49 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Theresa Day$29.41
  2. Specialty average$1,218.49

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through 2 group practices

  1. Houston Methodist Specialty PhysiciansHouston, TX
  2. Tmh Physician Associates PLLCBellaire, TX

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Theresa Ann Day among 121 geriatric medicine (family medicine) physician records in Texas

Theresa Ann Day, M.D. is one of 121 geriatric medicine (family medicine) physician records with a practice address in Texas. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 83% of them.

  • NPI issued2015 · 83% of these records are older, 12% newer
  • In a Medicare fileYes · 74% of these records are
  • In the CMS Doctors and Clinicians fileYes · 59% of these records are
  • Graduated2015 · median 2004 among the 71 with a school on file
  • Record last updated2026 · 56% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Family Medicine) Physician providers in Texas

There are 121 geriatric medicine (family medicine) physician records in Texas.

All 121 in Texas → Every provider in Houston → Geriatric Medicine (Family Medicine) Physician nationwide →

The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes

  1. Rechelle Asirot, MDHouston, TX 770301902118417
  2. Stephanie Canales, APRN, AGNP-BCHouston, TX 770301639916851
  3. Meenu Jacob, MDHouston, TX 770301730297540
  4. Deepa Ramamurthi, MDHouston, TX 770301639513286
  5. Connie Davis, NURSE PRACTITIONERHouston, TX 770281801494315
  6. Delma Montoya Monge, MDHouston, TX 770281558851246
  7. Jerome Wasserstein, D.O.Houston, TX 770271174584452
  8. Patrick Carter, MDHouston, TX 770251497785125

Common questions

What is Theresa Ann Day, M.D.'s NPI number?

Theresa Ann Day, M.D.'s National Provider Identifier (NPI) is 1881072007, issued on May 7, 2015. An NPI identifies a provider in billing; it is not a license.

Where is Theresa Ann Day, M.D. located?

The NPPES record lists a practice address at 6550 Fannin St, Houston, TX, 77030. Phone: (346) 238-7003. Providers update this record themselves, so call before visiting.

How can I verify Theresa Ann Day, M.D.'s license?

NPPES lists Texas license number U1177, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Theresa Ann Day, M.D. prescribe under Medicare Part D?

In 2024, Theresa Ann Day, M.D. had 1,920 Medicare Part D claims for 371 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.