Dr. Thomas E. Marshall, MD
- Medicare services, 2024
- 1,145
- Medicare patients, 2024
- 356
- Part D claims, 2024
- 2,297
- MIPS score, 2024
- 90
- Hospital affiliations
- 1
- Practice address
- 4401 Garth Road, Baytown, TX 77521
- Practice phone
- Call (281) 420-8600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marshall's professional email, personal email and mobile number
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Dr. Thomas E. Marshall is an ophthalmologist in Baytown, Texas
Dr. Marshall practices at Houston Methodist Baytown Hospital in Baytown, Texas, part of Houston Methodist.
Dr. Marshall's NPI, 1376571687, was assigned on June 28, 2006. Dr. Marshall graduated from Joe R. & Teresa Lozano Long School of Medicine in 1985. Dr. Marshall holds Texas license H0603.
- NPI
- 1376571687NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9234211095
- NPI enumeration date
- June 28, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (281) 420-8600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas E. Marshall practices at Houston Methodist Baytown Hospital in Baytown, Texas
Dr. Marshall's primary practice is Houston Methodist Baytown Hospital, at 4401 Garth Road, Baytown, TX 77521 in Harris County. The practice phone is (281) 420-8600.
- Houston Methodist Baytown Hospital4401 Garth Road, Baytown, TX 77521 · Harris CountyPhone(281) 420-8600
Source: Dmand AI Affiliation Data
Dr. Thomas E. Marshall is affiliated with 3 sites of care and 2 medical groups
Dr. Marshall's primary practice is Houston Methodist Baytown Hospital in Baytown, Texas, part of Houston Methodist. Dmand AI also links Dr. Marshall to 2 group practices and clinics and 2 medical groups, 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 E. Marshall's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marshall practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Houston Methodist Baytown Hospital | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Houston Methodist and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Thomas E. Marshall is one of 1,311 ophthalmologists in Texas
Ophthalmology is Dr. Marshall's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Marshall is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Marshall's licenses on file in 2 states: Texas and Wisconsin.
Specialties and state licenses
- Ophthalmology, TexasPrimary
- Wisconsin license
Clinical focus
Dmand AI lists age-related macular degeneration, cataract, cataract surgery with lens implant, conjunctivitis, dry eye, eyelid inflammation, glaucoma and inflammation of iris among the conditions Dr. Marshall treats.
Ophthalmologists near Dr. Marshall
Counts of ophthalmologists 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 E. Marshall billed Medicare for 1,145 services in 2024
CMS data shows 1,145 Medicare services from Dr. Marshall across 11 procedure codes in 2024, for 356 Medicare patients. Medicare paid $103,609 for them.
Dr. Marshall's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 9392024: 9643%
- Surgery
- 2023: 2012024: 16717%
- Imaging
- 2023: 182024: 1422%
- Office and hospital visits
- 2023: 272024: 0100%
Where Dr. Marshall's Medicare services took place, 2024
- In an office1,00688%
- In a facility13912%
Dr. Marshall compared with the Texas median for ophthalmologists, 2024
- Dr. Marshall
- Texas median
- Medicare services
- 1,145vs 1,35315% below
- Medicare patients
- 356vs 49228% below
- Part D claims
- 2,206vs 6133.6 times
Medians across 1,290 ophthalmologists in Texas with Dmand AI profiles that report each measure.
Dr. Marshall's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marshall and other ophthalmologists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas E. Marshall treated 356 Medicare patients in 2024, average age 77
CMS counts 356 Medicare patients who saw Dr. Marshall in 2024. The largest group is 75 to 84, with 177 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 3% are also on Medicaid. Their average risk score is 1.31, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marshall's median patient age at 76, with 60% women.
Dr. Marshall's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marshall's Medicare patients by sex, 2024
- Women21661%
- Men14039%
Chronic conditions among Dr. Marshall's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes41%
- Arthritis38%
- Ischemic heart disease38%
- Chronic kidney disease31%
- Anxiety21%
- Heart failure21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marshall's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women60%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas E. Marshall wrote 2,297 Medicare Part D claims in 2024
In 2024, Dr. Marshall wrote 2,297 Medicare Part D claims for 612 patients. 65% of them were for generic drugs. CMS names the drug for 2,206 of them, across 23 drugs with 11 or more claims each, at $208,730 in total drug cost. In 2023, CMS named 2,741 claims across 24 drugs.
Dr. Marshall's Part D claims by kind of drug, 2024
- Generic1,486 claims65%
- Brand-name811 claims35%
Dr. Marshall's most prescribed drugs by claims, 2024
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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,7412024: 2,20620%
Drugs named by CMS: 23 in 2024, 24 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Thomas E. Marshall scored 90 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 90 out of 100 for Dr. Marshall for performance year 2024, reported as part of a group. Dr. Marshall accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 250 procedures of cataract surgery by Dr. Marshall, more than 87% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Marshall's MIPS scores, performance year 2024
- 90of 100Final score
- 81.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Marshall ranks in Medicare procedure volume
- Cataract surgery
- 87th percentile250 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Thomas E. Marshall received $2,579 in industry payments from 2016 to 2025
CMS Open Payments shows 89 general payments to Dr. Marshall from 26 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 79% of the total. EyePoint Pharmaceuticals US, Inc. paid the most, $571.
General payments to Dr. Marshall by program year, 2016 to 2025
General payments to Dr. Marshall by kind, 2016 to 2025
- Food and beverage$2,04279%
- Consulting fees$50019%
- Education$381%
Companies that paid Dr. Marshall 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 E. Marshall has 1 award and honors on record
Dmand AI lists 1 award for Dr. Marshall.
Awards and honors for Dr. Marshall
- Undated
- AAO Fellow
Source: Dmand AI Professional Profile Data
Dr. Thomas E. Marshall graduated from Joe R. & Teresa Lozano Long School of Medicine
Dr. Marshall graduated from Joe R. & Teresa Lozano Long School of Medicine in 1985. Dr. Marshall is a member of AAO.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Thomas E. Marshall accepts plans from 22 insurance carriers
Dr. Marshall is in network with 22 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- HCSC
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- Cigna
- Humana
- +14 more carriersWith a free account
Plan types Dr. Marshall accepts, by number of carriers
- PPO14
- HMO13
- Medicare10
- POS7
- EPO4
Source: Dmand AI Insurance Network Data
Sources for Dr. Thomas E. Marshall'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 | Dmand AI Affiliation 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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 E. Marshall
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 E. Marshall's NPI number?
Dr. Thomas E. Marshall's NPI number is 1376571687. It was assigned on June 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas E. Marshall?
Dr. Thomas E. Marshall is an ophthalmologist in Baytown, Texas. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Thomas E. Marshall practice?
Dr. Marshall practices at 4401 Garth Road, Baytown, TX 77521. Dr. Marshall's primary practice is Houston Methodist Baytown Hospital in Baytown, Texas, part of Houston Methodist. Dmand AI also links Dr. Marshall to 2 group practices and clinics and 2 medical groups.
What is Dr. Thomas E. Marshall's office phone number?
The practice phone on file for Dr. Marshall is (281) 420-8600.
What is Dr. Thomas E. Marshall's medical license number?
Dr. Marshall holds Texas license H0603, one of the licenses on file in 2 states.
Which states has Dr. Thomas E. Marshall been licensed in?
Dmand AI has state licenses on file for Dr. Marshall in Texas (1986 to 2027) and Wisconsin (1986 to 1989).
Which hospitals is Dr. Thomas E. Marshall affiliated with?
Dr. Marshall practices at Houston Methodist Baytown Hospital in Baytown, Texas.
Does Dr. Thomas E. Marshall accept Medicare?
Yes. CMS data shows Dr. Marshall billed Medicare for 1,145 services in 2024, and Dr. Marshall accepts Medicare assignment.
What is Dr. Thomas E. Marshall's MIPS score?
Dr. Marshall's MIPS final score for performance year 2024 is 90 out of 100, reported as part of a group.
How many Medicare patients does Dr. Thomas E. Marshall see?
CMS counts 356 Medicare patients who saw Dr. Marshall in 2024, with an average age of 77.
Show 7 more questionsShow fewer questions
Is Dr. Thomas E. Marshall board certified?
Yes. Dr. Marshall is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. Thomas E. Marshall bill to Medicare?
In 2024, Dr. Marshall's most billed Medicare services were eye exam or test (92014), eye exam or test (92136) and surgery: eye (66984).
Where did Dr. Thomas E. Marshall go to medical school?
Dr. Marshall graduated from Joe R. & Teresa Lozano Long School of Medicine in 1985.
What drugs does Dr. Thomas E. Marshall prescribe most?
In 2024 Medicare Part D data, Dr. Marshall's most prescribed drugs by claims were Dexamethasone Sodium Phosphate, Ciprofloxacin HCl and Latanoprost.
Has Dr. Thomas E. Marshall received payments from drug or device companies?
CMS Open Payments shows $2,579 in general payments to Dr. Marshall from 26 companies from 2016 to 2025. The largest total came from EyePoint Pharmaceuticals US, Inc.
How long has Dr. Thomas E. Marshall been practicing?
Dr. Marshall graduated from medical school in 1985, 41 years ago.
What insurance does Dr. Thomas E. Marshall accept?
Dr. Marshall is in network with 22 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
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