Dr. John Charles Williamson , MD
Urology • Austin, TX
4007 James Casey St, C150
Austin, TX 787453369
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on May 17, 2006; this date does not establish years in practice.
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Published CMS data list 791 Original Medicare Part B services in 2021.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021. Published rows only; this is not a quality measure.
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Published Part B service records, 2021:
- 99490 — Chronic care management services: 262 service units.
- 99214 — Established patient outpatient office visit: 139 service units.
- 99213 — Established patient outpatient office visit: 124 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2020 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2021). CPT notice
See all 8 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 13 Medicare Part D prescriptions, including refills, in 2023.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2023. Published rows only; this is not a quality measure.
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Published Part D records, 2023:
- Myrbetriq (Mirabegron) — 13 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2023. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 2,273 in 2017 to 791 in 2021.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017–2021.
Practice Location & Contact Primary Location
4007 James Casey St
C150
Austin, TX 787453369
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Urology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $49,435 in 2021
The total amount Medicare approved for these services in 2021. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021.
Paid by Medicare
About $30,458 in 2021
The part of the Medicare-allowed amount that Medicare itself paid in 2021, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021.
30-day fills
13 standardized 30-day fills in 2023
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$6,197 in 2023
The total cost of these prescriptions in 2023, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2023.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $19.84 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Austin and Texas
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Williamson are from 2021.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Williamson are from 2023.
43 active clinicians are listed under Urology with a practice address in Austin, TX (961 in Texas).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Austin
60.5% of these 43 clinicians have the CMS telehealth indicator.
74.4% of these 43 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 65% from 2,273 in 2017 to 791 in 2021.
- 2017: 2,273
- 2018: 4,349
- 2019: 2,712
- 2020: 3,243
- 2021: 791
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Medicare-allowed amount
Medicare-allowed amount decreased 58% from $119,049 in 2017 to $49,435 in 2021.
- 2017: $119,049
- 2018: $168,345
- 2019: $146,697
- 2020: $183,971
- 2021: $49,435
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Paid by Medicare
Paid by Medicare decreased 65% from $86,708 in 2017 to $30,458 in 2021.
- 2017: $86,708
- 2018: $123,511
- 2019: $106,100
- 2020: $134,856
- 2021: $30,458
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 99% from 1,156 in 2019 to 13 in 2023.
- 2019: 1,156
- 2020: 1,205
- 2021: 653
- 2022: 16
- 2023: 13
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30-day fills
30-day fills decreased 99% from 2,237 in 2019 to 13 in 2023.
- 2019: 2,237
- 2020: 2,427
- 2021: 1,524
- 2022: 16
- 2023: 13
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Part D drug cost
Part D drug cost decreased 95% from $118,937 in 2019 to $6,197 in 2023.
- 2019: $118,937
- 2020: $100,535
- 2021: $68,278
- 2022: $7,269
- 2023: $6,197
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $422.50 in 2020 to $19.84 in 2024.
- 2020: $422.50
- 2021: $242.98
- 2022: $52.14
- 2023: $88.40
- 2024: $19.84
Sources: CMS Medicare Physician & Other Practitioners (2021), CMS Medicare Part D Prescribers (2023), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $19.84.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Boston Scientific Corporation |
Food and Beverage
Cash or cash equivalent
|
Intracept | General | $19.84 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2020 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2021; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99490
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month
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262 | 76 | $55.90 | $41.85 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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139 | 106 | $249.00 | $132.51 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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124 | 108 | $168.00 | $92.17 |
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36415
Insertion of needle into vein for collection of blood sample
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86 | 82 | $15.00 | $2.97 |
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51798
Ultrasound measurement of bladder capacity after voiding
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86 | 78 | $44.00 | $10.86 |
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99439
Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month
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56 | 44 | $55.00 | $38.32 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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22 | 21 | $101.00 | $58.18 |
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52000
Diagnostic exam of bladder and urethra using an endoscope
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16 | 16 | $477.00 | $250.47 |
Source: CMS Part B by Provider and Service, 2021; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2023.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Myrbetriq | Mirabegron | 13 | 390 | $6,197.46 | — |
Source: CMS Part D by Provider and Drug, 2023; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208800000X
A urologist manages benign and malignant medical and surgical disorders of the genitourinary system and the adrenal gland. This specialist has comprehensive knowledge of and skills in endoscopic, percutaneous and open surgery of congenital and acquired conditions of the urinary and reproductive systems and their contiguous structures.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Doctor of Nursing Practice, Advanced Practice Registered Nurse, Family Nurse Practitioner (Certified)
Clinical Nurse Specialist
AGCNSBC
Urology
Doctor of Medicine (M.D.)
Occupational Therapist
Occupational Therapist Registered
Physical Therapist
Physical Therapist, Doctor of Physical Therapy
Urology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated May 17, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Urology Specialists in Austin
- Dr. Robert Northway, MD
- Dr. Tyler Mcclintock, MD, MS
- Dr. Loren Jones, MD
- Dr. John Montorello, MD
- Dr. Win Shun Lai, MD
- Dr. Michael Mcclelland, MD
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Mailing Address
1020 W 34th St
Austin, TX 787052009
Phone: 5126871950