Dr. Joseph Williams, M.D.
What this data tells you about Dr. Williams
Dr. Joseph Williams is a radiation oncology specialist in San Antonio, TX, with 20 years of NPI registration. Based on federal Medicare data, Dr. Williams performed 14,914 Medicare services across 3,104 unique beneficiaries.
Between the years covered by Open Payments, Dr. Williams received a total of $2,068 from 11 pharmaceutical and/or device companies across 36 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in radiation oncology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Williams is Very High — reflecting how much public federal data is available about this provider. This is not a quality rating. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Contrast dye for imaging (iodine-based) | 11,795 | $0 | $0 |
| Chest X-ray, 1 view | 1,036 | $6 | $35 |
| 3D screening mammography (tomosynthesis) | 142 | $51 | $171 |
| Screening mammography | 140 | $121 | $266 |
| CT scan of head/brain, without contrast | 138 | $30 | $164 |
| Ct scan of blood vessels of chest with contrast | 104 | $65 | $352 |
| Chest X-ray, 2 views | 86 | $24 | $102 |
| CT scan of chest, without contrast | 72 | $99 | $836 |
| Complete ultrasound scan of abdomen | 53 | $86 | $377 |
| CT scan of abdomen and pelvis with contrast | 50 | $234 | $1,084 |
| Knee X-ray, 3 views | 49 | $7 | $37 |
| Mri scan of lower spinal canal without contrast | 45 | $147 | $1,603 |
| Hip X-ray, 2-3 views | 43 | $32 | $115 |
| Ct scan of upper spine without contrast | 42 | $35 | $206 |
| X-ray of lower and sacral spine, 2-3 views | 40 | $28 | $107 |
| X-ray of lower and sacral spine, minimum of 4 views | 40 | $37 | $151 |
| Ultrasound scan of head and neck soft tissue | 38 | $82 | $304 |
| Ct scan of chest with contrast | 36 | $98 | $995 |
| Shoulder X-ray, 2+ views | 35 | $23 | $89 |
| X-ray of ankle, minimum of 3 views | 35 | $6 | $34 |
| Ct scan of abdomen and pelvis without contrast | 30 | $142 | $850 |
| Drainage of fluid from abdominal cavity using imaging guidance | 28 | $76 | $426 |
| X-ray of thigh bone, minimum 2 views | 28 | $7 | $37 |
| Bone density scan (DEXA) | 28 | $35 | $328 |
| Foot X-ray, 3+ views | 26 | $24 | $84 |
| Ct scan of blood vessels and grafts of heart with contrast | 26 | $87 | $456 |
| Limited ultrasound scan behind abdominal cavity | 26 | $41 | $308 |
| X-ray of hand, minimum of 3 views | 24 | $27 | $86 |
| X-ray of lower leg, 2 views | 24 | $6 | $33 |
| Ultrasound study of arm or leg veins with compression and maneuvers | 24 | $25 | $133 |
| X-ray of abdomen, 2 views | 23 | $8 | $45 |
| Complete ultrasound scan of pelvis | 23 | $72 | $333 |
| X-ray of spine, 1 view | 22 | $18 | $71 |
| X-ray of wrist, minimum of 3 views | 22 | $6 | $34 |
| Ct scan of abdomen and pelvis before and after contrast | 22 | $271 | $1,374 |
| X-ray of upper spine, 2-3 views | 21 | $26 | $102 |
| X-ray of abdomen, 1 view | 21 | $22 | $86 |
| X-ray of middle spine, 2 views | 20 | $25 | $107 |
| Ultrasound scan of chest | 20 | $21 | $105 |
| Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) | 20 | $40 | $171 |
| X-ray of upper arm, minimum of 2 views | 19 | $6 | $33 |
| X-ray of knee, 1-2 views | 19 | $25 | $84 |
| Ct scan of blood vessels of abdomen and pelvis with contrast | 19 | $76 | $421 |
| Ct scan of heart structure with contrast | 19 | $55 | $335 |
| Complete ultrasound scan of 1 breast | 19 | $88 | $446 |
| Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina | 19 | $92 | $331 |
| Ultrasound of both sides of head and neck blood flow | 19 | $29 | $155 |
| X-ray of pelvis, 1-2 views | 18 | $6 | $34 |
| Aspiration of fluid from chest cavity using imaging guidance | 17 | $83 | $438 |
| Mri scan of upper spinal canal without contrast | 16 | $139 | $1,516 |
| Diagnostic mammography of 1 breast | 16 | $24 | $158 |
| Nuclear medicine study of lung circulation | 15 | $23 | $141 |
| X-ray lower and sacral spine, minimum of 6 views | 14 | $44 | $193 |
| X-ray of sacrum and tailbone, minimum of 2 views | 14 | $25 | $91 |
| Limited ultrasound scan of abdomen | 14 | $67 | $286 |
| Ultrasound of abdomen and pelvis artery and vein blood flow | 14 | $29 | $154 |
| X-ray of forearm, 2 views | 13 | $6 | $33 |
| Diagnostic mammography of both breasts | 13 | $119 | $323 |
| Nuclear medicine study of bone and/or joint whole body | 13 | $201 | $679 |
| Ultrasound study of one arm or leg veins with compression and maneuvers | 13 | $69 | $466 |
| Technetium tc-99m medronate, diagnostic, per study dose, up to 30 millicuries | 13 | $31 | $40 |
| X-ray of upper spine, 4-5 views | 12 | $38 | $149 |
| X-ray of both hips, 3-4 views | 12 | $38 | $148 |
| X-ray of ankle, 2 views | 12 | $5 | $33 |
| Ultrasound scan of scrotum | 12 | $23 | $124 |
| Ct scan of pelvis without contrast | 11 | $40 | $211 |
| X-ray of hip, 1 view | 11 | $6 | $37 |
| Ultrasound of one leg arteries or artery grafts | 11 | $17 | $94 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
Associated products mentioned in payments ›
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Williams is a mixed practice specialist, with above-average Medicare volume (top 5% in TX), with low-engagement industry engagement in the top 19% of TX peers, with 20 years of NPI registration.
This summary is auto-generated from federal data. It describes data availability and patterns — not clinical quality. Read our methodology →
Frequently Asked Questions
Is Dr. Williams experienced with contrast dye for imaging (iodine-based)?
Does Dr. Williams receive payments from pharmaceutical companies?
How do Dr. Williams's costs compare to other radiation oncologists in San Antonio?
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. The Transparency Score measures data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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