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.
- 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
Also registered at 6550 Fannin St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Talha Akram, MDStudent in an Organized Health Care Education/Training Program1346180577
- Mahmoud Al Rifai, M.D.Cardiovascular Disease Physician1922456219
- Jaden Aland, MDStudent in an Organized Health Care Education/Training Program1114868213
- James Albright, MDPediatric Otolaryngology Physician1548255805
Verify Theresa Ann Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license U1177Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
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.
Most prescribed
- Atorvastatin Calcium121 claims
- Rosuvastatin Calcium75 claims
- Amlodipine Besylate67 claims
- Gabapentin63 claims
- Lisinopril63 claims
- 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.
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
- Houston Methodist Specialty PhysiciansHouston, TX
- Tmh Physician Associates PLLCBellaire, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geriatric Medicine (Family Medicine) Physician providers in Texas
There are 121 geriatric medicine (family medicine) physician records in Texas.
Other geriatric medicine (family medicine) physician records in Texas
- Adekunle Adedeji, M.D.El Paso, TX1902086937
- Shekher Adolph, M.D.San Antonio, TX1982728853
- Raul Aguilar, M.D.Lackland A F B, TX1164492120
- Saamia Ahmed, M.D.Irving, TX1306232509
- Adeeba Akhtar, M.D.Houston, TX1447264429
- Mohammad Alam, MDSugar Land, TX1669535357
- Nimat Alam, MDOdessa, TX1972737898
- Teresa Albright, M.D.Houston, TX1427018969
- Anita Alvarez-Cruz, M.D.Katy, TX1235297409
- Maria Ambalong, MDDallas, TX1285660076
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.
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.