Dr. John Andrew Williamson, MD
- Medicare services, 2024
- 4,031
- Medicare patients, 2024
- 2,126
- Part D claims, 2024
- 40
- MIPS score, 2024
- 75
- Hospital affiliations
- 5
- Practice address
- 901 West Ben White Blvd, Austin, TX 78704
- Practice phone
- Call (512) 448-7107
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Williamson's professional email, personal email and mobile number
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Dr. John Andrew Williamson is a diagnostic radiologist in Austin, Texas
Dr. Williamson practices at St. David's South Austin Medical Center in Austin, Texas, part of HCA Healthcare.
Dr. Williamson's NPI, 1083732176, was assigned on March 27, 2007. Dr. Williamson graduated from Duke University School Of Medicine in 1998. Dr. Williamson holds Texas license N3389.
- NPI
- 1083732176NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6406909266
- NPI enumeration date
- March 27, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (512) 448-7107
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Andrew Williamson practices at St. David's South Austin Medical Center in Austin, Texas
Dr. Williamson's primary practice is St. David's South Austin Medical Center, at 901 West Ben White Blvd, Austin, TX 78704 in Travis County. The practice phone is (512) 448-7107.
- St. David's South Austin Medical Center901 West Ben White Blvd, Austin, TX 78704 · Travis CountyPhone(512) 448-7107
Source: Dmand AI Affiliation Data
Dr. John Andrew Williamson is affiliated with 6 sites of care and 2 medical groups
Dr. Williamson's primary practice is St. David's South Austin Medical Center in Austin, Texas, part of HCA Healthcare. Dr. Williamson is also affiliated with St. David's Medical Center. The medical group on file is Singleton Associates PA. Dmand AI also links Dr. Williamson to 3 more hospitals, 1 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. John Andrew Williamson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williamson practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. David's South Austin Medical Center | Available with a free account |
| +5 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Andrew Williamson is one of 2,616 diagnostic radiologists in Texas
Diagnostic radiology is Dr. Williamson's primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dr. Williamson is board certified in interventional radiology and diagnostic radiology by the American Board of Radiology. Dmand AI has Dr. Williamson's licenses on file in 3 states: Texas, Oregon and North Carolina.
Specialties and state licenses
- Diagnostic radiology, TexasPrimary
- Oregon license
- North Carolina license
Diagnostic radiologists near Dr. Williamson
Counts of diagnostic radiologists 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. John Andrew Williamson billed Medicare for 4,031 services in 2024
CMS data shows 4,031 Medicare services from Dr. Williamson across 36 procedure codes in 2024, for 2,126 Medicare patients. Medicare paid $74,147 for them.
Dr. Williamson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 2,5382024: 2,550No change
- Other services
- 2023: 1,4002024: 1,2759%
- Surgery
- 2023: 912024: 10920%
- Tests and treatments
- 2023: 1362024: 9729%
- Lab and pathology
- 2023: 182024: 0100%
Where Dr. Williamson's Medicare services took place, 2024
- In an office1,47537%
- In a facility2,55663%
Dr. Williamson compared with the Texas median for diagnostic radiologists, 2024
- Dr. Williamson
- Texas median
- Medicare services
- 4,031vs 1,8742.2 times
- Medicare patients
- 2,126vs 1,28466% above
Medians across 2,414 diagnostic radiologists in Texas with Dmand AI profiles that report each measure.
Dr. Williamson'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. Williamson and other diagnostic radiologists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Andrew Williamson treated 2,126 Medicare patients in 2024, average age 76
CMS counts 2,126 Medicare patients who saw Dr. Williamson in 2024. The largest group is 75 to 84, with 809 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.98, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Williamson's median patient age at 68, with 55% women.
Dr. Williamson's Medicare patients by age, 2024
Dr. Williamson's Medicare patients by sex, 2024
- Women1,11252%
- Men1,01448%
Chronic conditions among Dr. Williamson's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Ischemic heart disease47%
- Diabetes38%
- Chronic kidney disease37%
- Heart failure37%
- Mood disorders37%
Share of Medicare patients with each condition. A patient can have several.
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 68
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Andrew Williamson wrote 40 Medicare Part D claims in 2024
In 2024, Dr. Williamson wrote 40 Medicare Part D claims. 100% of them were for generic drugs.
Drug classes CMS tracks in Dr. Williamson's Part D claims, 2024
- Antibiotics35%14 of 40 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. John Andrew Williamson scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Williamson for performance year 2024, reported individually. Dr. Williamson accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Williamson as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- MIPS final score, 2024
- 75 of 100
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John Andrew Williamson received $6,982 in industry payments from 2016 to 2025
CMS Open Payments shows 110 general payments to Dr. Williamson from 21 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 74% of the total. Boston Scientific Corporation paid the most, $1,995.
General payments to Dr. Williamson by program year, 2016 to 2025
General payments to Dr. Williamson by kind, 2016 to 2025
- Food and beverage$5,13974%
- Travel and lodging$1,84326%
Companies that paid Dr. Williamson 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. John Andrew Williamson graduated from Duke University School Of Medicine
Dr. Williamson graduated from Duke University School Of Medicine in 1998.
- Medical school
- Board certified in interventional radiology and diagnostic radiology
Source: Dmand AI Professional Profile Data
Dr. John Andrew Williamson accepts plans from 16 insurance carriers
Dr. Williamson is in network with 16 carriers, including Aetna, Excellus BlueCross BlueShield and Elevance. HMO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Excellus BlueCross BlueShield
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Alliant Health Plans
- HCSC
- Baylor Scott and White
- +8 more carriersWith a free account
Plan types Dr. Williamson accepts, by number of carriers
- HMO10
- PPO9
- POS6
- EPO4
- Medicare4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Andrew 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 | 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 (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) |
| 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. John Andrew 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. John Andrew Williamson's NPI number?
Dr. John Andrew Williamson's NPI number is 1083732176. It was assigned on March 27, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. John Andrew Williamson?
Dr. John Andrew Williamson is a diagnostic radiologist in Austin, Texas. The primary specialty in the NPI Registry is Diagnostic Radiology Physician (taxonomy code 2085R0202X).
Where does Dr. John Andrew Williamson practice?
Dr. Williamson practices at 901 West Ben White Blvd, Austin, TX 78704. Dr. Williamson's primary practice is St. David's South Austin Medical Center in Austin, Texas, part of HCA Healthcare. Dmand AI also links Dr. Williamson to 3 hospitals, 1 group practice or clinic and 1 medical group.
What is Dr. John Andrew Williamson's office phone number?
The practice phone on file for Dr. Williamson is (512) 448-7107.
What is Dr. John Andrew Williamson's medical license number?
Dr. Williamson holds Texas license N3389, one of the licenses on file in 3 states.
Which states has Dr. John Andrew Williamson been licensed in?
Dmand AI has state licenses on file for Dr. Williamson in Texas (2009 to 2027), Oregon (since 2008) and North Carolina (2000 to 2025).
Which hospitals is Dr. John Andrew Williamson affiliated with?
Dr. Williamson practices at St. David's South Austin Medical Center in Austin, Texas. Dr. Williamson is also affiliated with St. David's Medical Center. Dmand AI links Dr. Williamson to 3 more hospitals.
What medical group is Dr. John Andrew Williamson part of?
Dr. Williamson is linked to Singleton Associates PA. Dmand AI links Dr. Williamson to 1 more medical group.
Does Dr. John Andrew Williamson accept Medicare?
Yes. CMS data shows Dr. Williamson billed Medicare for 4,031 services in 2024, and Dr. Williamson accepts Medicare assignment.
Does Dr. John Andrew Williamson offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Williamson as offering telehealth services.
Show 8 more questionsShow fewer questions
What is Dr. John Andrew Williamson's MIPS score?
Dr. Williamson's MIPS final score for performance year 2024 is 75 out of 100, reported individually.
How many Medicare patients does Dr. John Andrew Williamson see?
CMS counts 2,126 Medicare patients who saw Dr. Williamson in 2024, with an average age of 76.
Is Dr. John Andrew Williamson board certified?
Yes. Dr. Williamson is board certified in interventional radiology and diagnostic radiology by the American Board of Radiology.
What services does Dr. John Andrew Williamson bill to Medicare?
In 2024, Dr. Williamson's most billed Medicare services were medicare temporary code (Q9967), diagnostic imaging (71045) and diagnostic imaging (74177).
Where did Dr. John Andrew Williamson go to medical school?
Dr. Williamson graduated from Duke University School Of Medicine in 1998.
Has Dr. John Andrew Williamson received payments from drug or device companies?
CMS Open Payments shows $6,982 in general payments to Dr. Williamson from 21 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. John Andrew Williamson been practicing?
Dr. Williamson graduated from medical school in 1998, 28 years ago.
What insurance does Dr. John Andrew Williamson accept?
Dr. Williamson is in network with 16 carriers, including Aetna, Excellus BlueCross BlueShield and Elevance. HMO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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