Dr. Thomas Stephen Brennan, MD
- Medicare services, 2022
- 231
- Part D claims, 2022
- 284
- Hospital affiliations
- 1
- Industry payments
- $815
- Medical groups
- 2
- Practice address
- 710 Cypress Creek Parkway, Houston, TX 77090
- Practice phone
- Call (281) 440-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Brennan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Thomas Stephen Brennan is a nephrologist in Houston, Texas
Dr. Brennan practices at HCA Houston Healthcare Northwest in Houston, Texas, part of HCA Healthcare.
Dr. Brennan's NPI, 1215937255, was assigned on July 29, 2005. Dr. Brennan graduated from Loyola University Chicago Stritch School of Medicine in 1979. Dr. Brennan's Texas license number on file is H1743.
- NPI
- 1215937255NPI Registry (opens in a new tab)
- NPI enumeration date
- July 29, 2005
- NPI status
- Active
- Practice phone
- (281) 440-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Thomas Stephen Brennan practices at 2 locations in Houston, Texas
Dr. Brennan's primary practice is HCA Houston Healthcare Northwest, at 710 Cypress Creek Parkway, Houston, TX 77090 in Harris County. The practice phone is (281) 440-1000. Dr. Brennan also practices at Northwest Houston Hospital, 709 Cypress Station Dr, Houston, TX 77090.
- HCA Houston Healthcare NorthwestPrimary710 Cypress Creek Parkway, Houston, TX 77090 · Harris CountyPhone(281) 440-1000
- Northwest Houston Hospital709 Cypress Station Dr, Houston, TX 77090 · Harris CountyPhone(281) 587-3200
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Thomas Stephen Brennan is affiliated with 2 sites of care and 2 medical groups
Dr. Brennan's primary practice is HCA Houston Healthcare Northwest in Houston, Texas, part of HCA Healthcare. The medical group on file is Renal Specialists of Houston. Dmand AI also links Dr. Brennan to 1 more group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas Stephen Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brennan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| HCA Houston Healthcare Northwest | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas Stephen Brennan is one of 1,045 nephrologists in Texas
Nephrology is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Brennan is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Brennan's licenses on file in 2 states: Texas and Illinois.
Specialties and state licenses
- Nephrology, TexasPrimary
- Illinois license
Nephrologists near Dr. Brennan
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Thomas Stephen Brennan billed Medicare for 231 services in 2022
CMS data shows 231 Medicare services from Dr. Brennan across 4 procedure codes in 2022. Medicare paid $38,543 for them.
Dr. Brennan's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Tests and treatments
- 2021: 4832022: 11975%
- Office and hospital visits
- 2021: 2762022: 11259%
Where Dr. Brennan's Medicare services took place, 2022
- In an office13358%
- In a facility9842%
Dr. Brennan compared with the Texas median for nephrologists, 2022
- Dr. Brennan
- Texas median
- Medicare services
- 231vs 1,04878% below
- Part D claims
- 284vs 75863% below
Medians across 1,017 nephrologists in Texas with Dmand AI profiles that report each measure.
Dr. Brennan's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Brennan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Brennan and other nephrologists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas Stephen Brennan's patients have a median age of 59
Across all payers, Dmand AI patient panel data puts Dr. Brennan's median patient age at 59, with 48% women.
Dr. Brennan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women48%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Thomas Stephen Brennan wrote 284 Medicare Part D claims in 2022
In 2022, Dr. Brennan wrote 284 Medicare Part D claims. They cover 14 drugs, with $24,531 in total drug cost. In 2021, CMS named 426 claims across 19 drugs.
Dr. Brennan's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 4262022: 28433%
Drugs named by CMS: 14 in 2022, 19 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Thomas Stephen Brennan received $815 in industry payments from 2016 to 2025
CMS Open Payments shows 16 general payments to Dr. Brennan from 8 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Kerecis Limited paid the most, $402.
General payments to Dr. Brennan by program year, 2016 to 2025
Companies that paid Dr. Brennan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Thomas Stephen Brennan graduated from Loyola University Chicago Stritch School of Medicine
Dr. Brennan graduated from Loyola University Chicago Stritch School of Medicine in 1979.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Thomas Stephen Brennan accepts plans from 2 insurance carriers
Dr. Brennan is in network with 2 carriers, including Excellus BlueCross BlueShield and Cigna. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
- Cigna
Plan types Dr. Brennan accepts, by number of carriers
- HMO2
- Medicare2
- PPO2
- EPO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Thomas Stephen Brennan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Thomas Stephen Brennan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Thomas Stephen Brennan's NPI number?
Dr. Thomas Stephen Brennan's NPI number is 1215937255. It was assigned on July 29, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Stephen Brennan?
Dr. Thomas Stephen Brennan is a nephrologist in Houston, Texas. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Thomas Stephen Brennan practice?
Dr. Brennan practices at 710 Cypress Creek Parkway, Houston, TX 77090. Dr. Brennan also practices at 709 Cypress Station Dr, Houston, TX 77090. Dr. Brennan's primary practice is HCA Houston Healthcare Northwest in Houston, Texas, part of HCA Healthcare. Dmand AI also links Dr. Brennan to 1 group practice or clinic and 1 medical group.
What is Dr. Thomas Stephen Brennan's office phone number?
The practice phone on file for Dr. Brennan is (281) 440-1000.
What is Dr. Thomas Stephen Brennan's medical license number?
Dr. Brennan's Texas license number on file is H1743, one of the licenses on file in 2 states.
Which states has Dr. Thomas Stephen Brennan been licensed in?
Dmand AI has state licenses on file for Dr. Brennan in Texas (1987 to 2025) and Illinois (1982 to 1987).
Which hospitals is Dr. Thomas Stephen Brennan affiliated with?
Dr. Brennan practices at HCA Houston Healthcare Northwest in Houston, Texas.
What medical group is Dr. Thomas Stephen Brennan part of?
Dr. Brennan is linked to Renal Specialists of Houston. Dmand AI links Dr. Brennan to 1 more medical group.
Does Dr. Thomas Stephen Brennan accept Medicare?
Yes. CMS data shows Dr. Brennan billed Medicare for 231 services in 2022.
Is Dr. Thomas Stephen Brennan board certified?
Yes. Dr. Brennan is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Thomas Stephen Brennan bill to Medicare?
In 2022, Dr. Brennan's most billed Medicare services were dialysis (90960), hospital inpatient care (99231) and hospital inpatient care (99232).
Where did Dr. Thomas Stephen Brennan go to medical school?
Dr. Brennan graduated from Loyola University Chicago Stritch School of Medicine in 1979.
What drugs does Dr. Thomas Stephen Brennan prescribe most?
In 2022 Medicare Part D data, Dr. Brennan's most prescribed drugs by claims were Sevelamer Carbonate, Gabapentin and Amlodipine Besylate.
Has Dr. Thomas Stephen Brennan received payments from drug or device companies?
CMS Open Payments shows $815 in general payments to Dr. Brennan from 8 companies from 2016 to 2025. The largest total came from Kerecis Limited.
How long has Dr. Thomas Stephen Brennan been practicing?
Dr. Brennan graduated from medical school in 1979, 47 years ago.
What insurance does Dr. Thomas Stephen Brennan accept?
Dr. Brennan is in network with 2 carriers, including Excellus BlueCross BlueShield and Cigna. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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