Neuroscientist
Alzheimer DiseaseBrainCell Differentiation
Dr. Robert A. Williamson, MD
NPI1821095696
- Medicare services, 2017
- 43
- Part D claims, 2017
- 1,372
- Publications
- 40
- Industry payments
- $217
- State license
- 1
- Practice address
- 1605 N Sarah Dewitt Dr, Gonzales, TX 78629-2700
- Practice phone
- Call (830) 672-4601
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
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Dr. Robert A. Williamson is a general practice physician in Gonzales, Texas
Dr. Williamson practices in Gonzales, Texas.
Dr. Williamson's NPI, 1821095696, was assigned on July 7, 2005. Dr. Williamson graduated from UTMB Health in 1972. Dr. Williamson holds Texas license D9725.
NPI and contact details
- NPI
- 1821095696NPI Registry (opens in a new tab)
- NPI enumeration date
- July 7, 2005
- NPI status
- Active
- Practice phone
- (830) 672-4601
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1972
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Robert A. Williamson's practice address is in Gonzales, Texas
Dr. Williamson's practice address in the NPI Registry is 1605 N Sarah Dewitt Dr, Gonzales, TX 78629-2700. The practice phone is (830) 672-4601.
- NPI Registry address1605 N Sarah Dewitt Dr, Gonzales, TX 78629-2700Phone(830) 672-4601
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Robert A. Williamson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williamson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Williamson's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert A. Williamson is one of 800 general practice physicians in Texas
General practice is Dr. Williamson's primary specialty in the NPI Registry, under taxonomy code 208D00000X. Dr. Williamson is licensed in Texas.
Specialties and state licenses
- General practice, TexasPrimary
General practice physicians near Dr. Williamson
Counts of general practice physicians with a Dmand AI profile, by place and practice. Each opens the list.
800general practice physicians in Texas
2general practice physicians in Gonzales
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Robert A. Williamson billed Medicare for 43 services in 2017
CMS data shows 43 Medicare services from Dr. Williamson across 2 procedure codes in 2017. Medicare paid $3,269 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201743
Paid by Medicare$3,269
Procedure codes2
Dr. Williamson's Medicare services by type, 2016 to 2017
- 2016
- 2017
- Office and hospital visits
- 2016: 7942017: 4395%
Dr. Williamson compared with the Texas median for general practice physicians, 2017
- Dr. Williamson
- Texas median
- Medicare services
- 43vs 19478% below
- Part D claims
- 1,372vs 13010.6 times
Medians across 415 general practice physicians in Texas with Dmand AI profiles that report each measure.
Dr. Williamson's most billed Medicare procedure codes, 2017
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert A. Williamson's patients have a median age of 54
Across all payers, Dmand AI patient panel data puts Dr. Williamson's median patient age at 54, with 33% women.
Dr. Williamson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 54
Patient panel by sex, all payers
- Women33%
- Men67%
Source: Dmand AI Patient Panel Data
Dr. Robert A. Williamson wrote 1,372 Medicare Part D claims in 2017
In 2017, Dr. Williamson wrote 1,372 Medicare Part D claims. They cover 48 drugs, with $47,177 in total drug cost. In 2016, CMS named 4,728 claims across 114 drugs.
Part D claims, 20171,372
Drugs named by CMS48
Total drug cost$47,177
Dr. Williamson's most prescribed drugs by claims, 2017
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, 2016 to 2017
- 2016
- 2017
- Claims for drugs CMS names
- 2016: 4,7282017: 1,37271%
Drugs named by CMS: 48 in 2017, 114 in 2016.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Robert A. Williamson has 40 publications on record
Dmand AI links 40 papers to Dr. Williamson, published from 2001 to 2020. 2007 was the busiest year, with 3. The most frequent topics are Amino Acid Sequence, Molecular Sequence Data and PrPSc Proteins. Dr. Williamson has published most often in J Biol Chem. Dr. Williamson's most frequent co-authors are Robert A. Williamson, MD, Omar A. Ghausi, MD and John Steven Oghalai, MD.
Papers40
Years published2001 to 2020
Dr. Williamson's papers by year, 2001 to 2020
Topics Dr. Williamson writes about most
- Amino Acid Sequence
- Molecular Sequence Data
- PrPSc Proteins
- Brain
- PrPC Proteins
- Antibody Specificity
- Base Sequence
- Mice, Transgenic
Dr. Williamson's most frequent co-authors
- Robert A. Williamson, MD2 shared papers
- Omar A. Ghausi, MD1 shared paper
- John Steven Oghalai, MD1 shared paper
Recent publications by Dr. Williamson
Alzheimer DiseaseAmyloid beta-PeptidesBrain
Int J Pediatr Otorhinolaryngol
Cochlear ImplantationCochlear ImplantsCockayne Syndrome
AmyloidosisBrainCardiomyopathies
See who Dr. Williamson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Williamson works with, so you can find a warm path to the right general practice physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Robert A. Williamson received $217 in industry payments in 2024
CMS Open Payments shows 2 general payments to Dr. Williamson from 2 drug and device companies in 2024. Food and beverage make up the largest share, 100% of the total. Integra LifeSciences Corporation paid the most, $161.
Companies that paid Dr. Williamson the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert A. Williamson graduated from UTMB Health
Dr. Williamson graduated from UTMB Health in 1972.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert A. Williamson'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 Practice 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Robert A. Williamson
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. Robert A. Williamson's NPI number?
Dr. Robert A. Williamson's NPI number is 1821095696. It was assigned on July 7, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert A. Williamson?
Dr. Robert A. Williamson is a general practice physician in Gonzales, Texas. The primary specialty in the NPI Registry is General Practice Physician (taxonomy code 208D00000X).
Where does Dr. Robert A. Williamson practice?
Dr. Williamson practices at 1605 N Sarah Dewitt Dr, Gonzales, TX 78629-2700.
What is Dr. Robert A. Williamson's office phone number?
The practice phone on file for Dr. Williamson is (830) 672-4601.
What is Dr. Robert A. Williamson's medical license number?
Dr. Williamson holds Texas license D9725.
Does Dr. Robert A. Williamson accept Medicare?
Yes. CMS data shows Dr. Williamson billed Medicare for 43 services in 2017.
What services does Dr. Robert A. Williamson bill to Medicare?
In 2017, Dr. Williamson's most billed Medicare services were emergency department visit (99284) and emergency department visit (99283).
Where did Dr. Robert A. Williamson go to medical school?
Dr. Williamson graduated from UTMB Health in 1972.
What drugs does Dr. Robert A. Williamson prescribe most?
In 2017 Medicare Part D data, Dr. Williamson's most prescribed drugs by claims were Levothyroxine Sodium, Hydrochlorothiazide and Rosuvastatin Calcium.
Has Dr. Robert A. Williamson received payments from drug or device companies?
CMS Open Payments shows $217 in general payments to Dr. Williamson from 2 companies from 2024 to 2024. The largest total came from Integra LifeSciences Corporation.
Show 3 more questionsShow fewer questions
How long has Dr. Robert A. Williamson been practicing?
Dr. Williamson graduated from medical school in 1972, 54 years ago.
Does Dr. Robert A. Williamson do research?
Dmand AI links 40 publications to Dr. Williamson, published from 2001 to 2020.
Who does Dr. Robert A. Williamson publish with?
Dr. Williamson's most frequent co-authors are Robert A. Williamson, MD (2 shared papers), Omar A. Ghausi, MD (1 shared paper) and John Steven Oghalai, MD (1 shared paper).
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