Dr. John Grady Williams, MD
- Medicare services, 2024
- 15,745
- Medicare patients, 2024
- 3,370
- MIPS score, 2024
- 100
- Hospital affiliations
- 5
- Industry payments
- $474
- Practice address
- 12554 Riata Vista Cir, Austin, TX 78727
- Practice phone
- Call (512) 795-5100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
ARA Diagnostic Imaging - Austin Radiological Association
Imaging Center - Main Location · Austin, Texas
Find Dr. Williams' 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. John Grady Williams is a diagnostic radiologist in Austin, Texas
Dr. Williams practices at ARA Diagnostic Imaging - Austin Radiological Association in Austin, Texas.
Dr. Williams' NPI, 1902855281, was assigned on May 6, 2006. Dr. Williams graduated from Texas Tech University Health Sciences Center School of Medicine in 2001. Dr. Williams holds Texas license M6955.
- NPI
- 1902855281NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840294914
- NPI enumeration date
- May 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (512) 795-5100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Grady Williams practices at ARA Diagnostic Imaging - Austin Radiological Association in Austin, Texas
Dr. Williams' primary practice is ARA Diagnostic Imaging - Austin Radiological Association, at 12554 Riata Vista Cir, Austin, TX 78727. The practice phone is (512) 795-5100.
- ARA Diagnostic Imaging - Austin Radiological Association12554 Riata Vista Cir, Austin, TX 78727Phone(512) 795-5100
Source: Dmand AI Affiliation Data
Dr. John Grady Williams is affiliated with 7 sites of care and 2 medical groups
Dr. Williams' primary practice is ARA Diagnostic Imaging - Austin Radiological Association in Austin, Texas. Dr. Williams is also affiliated with St. David's Medical Center. The medical group on file is Singleton Associates PA. Dmand AI also links Dr. Williams to 4 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 Grady Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| ARA Diagnostic Imaging - Austin Radiological Association | Available with a free account |
| +6 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Grady Williams is one of 2,616 diagnostic radiologists in Texas
Diagnostic radiology is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dr. Williams is board certified in diagnostic radiology by the American Board of Radiology. Dmand AI has Dr. Williams' licenses on file in 3 states: Texas, Wisconsin and Georgia.
Specialties and state licenses
- Diagnostic radiology, TexasPrimary
- Wisconsin license
- Georgia license
Diagnostic radiologists near Dr. Williams
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 Grady Williams billed Medicare for 15,745 services in 2024
CMS data shows 15,745 Medicare services from Dr. Williams across 51 procedure codes in 2024, for 3,370 Medicare patients. Medicare paid $145,140 for them.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 7,2562024: 11,54259%
- Imaging
- 2023: 4,3872024: 4,0837%
- Tests and treatments
- 2023: 902024: 7517%
- Surgery
- 2023: 112024: 25127%
- Lab and pathology
- 2023: 362024: 2044%
Where Dr. Williams' Medicare services took place, 2024
- In an office12,51079%
- In a facility3,23521%
Dr. Williams compared with the Texas median for diagnostic radiologists, 2024
- Dr. Williams
- Texas median
- Medicare services
- 15,745vs 1,8748.4 times
- Medicare patients
- 3,370vs 1,2842.6 times
Medians across 2,414 diagnostic radiologists in Texas with Dmand AI profiles that report each measure.
Dr. Williams' 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. Williams 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 Grady Williams treated 3,370 Medicare patients in 2024, average age 75
CMS counts 3,370 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 1,435 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 10% are also on Medicaid. Their average risk score is 1.63, 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. Williams' median patient age at 67, with 59% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women1,95358%
- Men1,41742%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Ischemic heart disease40%
- Mood disorders33%
- Anxiety32%
- Diabetes32%
- Atrial fibrillation30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Grady Williams scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Williams for performance year 2024, reported as part of a group. Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Williams' MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
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 Grady Williams received $474 in industry payments from 2017 to 2025
CMS Open Payments shows 5 general payments to Dr. Williams from 4 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Penumbra, Inc. paid the most, $233.
General payments to Dr. Williams by program year, 2017 to 2025
Companies that paid Dr. Williams the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Grady Williams has 1 award and honors on record
Dmand AI lists 1 award for Dr. Williams.
Awards and honors for Dr. Williams
- Undated
- Super Doc
Source: Dmand AI Professional Profile Data
Dr. John Grady Williams graduated from Texas Tech University Health Sciences Center School of Medicine
Dr. Williams graduated from Texas Tech University Health Sciences Center School of Medicine in 2001.
- Medical school
- Board certified in diagnostic radiology
Source: Dmand AI Professional Profile Data
Dr. John Grady Williams accepts plans from 16 insurance carriers
Dr. Williams is in network with 16 carriers, including Aetna, Excellus BlueCross BlueShield and United Healthcare. HMO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Excellus BlueCross BlueShield
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Elevance
- Alliant Health Plans
- HCSC
- Aspirus Health Plan
- +8 more carriersWith a free account
Plan types Dr. Williams accepts, by number of carriers
- HMO10
- PPO9
- POS6
- EPO4
- Medicare4
Source: Dmand AI Insurance Network Data
Sources for Dr. John Grady Williams'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) |
| 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) |
| 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. John Grady Williams
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 Grady Williams' NPI number?
Dr. John Grady Williams' NPI number is 1902855281. It was assigned on May 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Grady Williams?
Dr. John Grady Williams 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 Grady Williams practice?
Dr. Williams practices at 12554 Riata Vista Cir, Austin, TX 78727. Dr. Williams' primary practice is ARA Diagnostic Imaging - Austin Radiological Association in Austin, Texas. Dmand AI also links Dr. Williams to 4 hospitals, 1 group practice or clinic and 1 medical group.
What is Dr. John Grady Williams' office phone number?
The practice phone on file for Dr. Williams is (512) 795-5100.
What is Dr. John Grady Williams' medical license number?
Dr. Williams holds Texas license M6955, one of the licenses on file in 3 states.
Which states has Dr. John Grady Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in Texas (2007 to 2027), Wisconsin (2006 to 2025) and Georgia (2006 to 2017).
Which hospitals is Dr. John Grady Williams affiliated with?
Dr. Williams is affiliated with St. David's Medical Center. Dmand AI links Dr. Williams to 4 more hospitals.
What medical group is Dr. John Grady Williams part of?
Dr. Williams is linked to Singleton Associates PA. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. John Grady Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 15,745 services in 2024, and Dr. Williams accepts Medicare assignment.
What is Dr. John Grady Williams' MIPS score?
Dr. Williams' MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
Show 7 more questionsShow fewer questions
How many Medicare patients does Dr. John Grady Williams see?
CMS counts 3,370 Medicare patients who saw Dr. Williams in 2024, with an average age of 75.
Is Dr. John Grady Williams board certified?
Yes. Dr. Williams is board certified in diagnostic radiology by the American Board of Radiology.
What services does Dr. John Grady Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were medical supplies or transport (A9585), medicare temporary code (Q9967) and diagnostic imaging (71045).
Where did Dr. John Grady Williams go to medical school?
Dr. Williams graduated from Texas Tech University Health Sciences Center School of Medicine in 2001.
Has Dr. John Grady Williams received payments from drug or device companies?
CMS Open Payments shows $474 in general payments to Dr. Williams from 4 companies from 2017 to 2025. The largest total came from Penumbra, Inc.
How long has Dr. John Grady Williams been practicing?
Dr. Williams graduated from medical school in 2001, 25 years ago.
What insurance does Dr. John Grady Williams accept?
Dr. Williams is in network with 16 carriers, including Aetna, Excellus BlueCross BlueShield and United Healthcare. HMO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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