Dr. David R Knowles , MD
Urology • Mount Vernon, IL
4109 S Water Tower Pl
Mount Vernon, IL 628646293
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 June 15, 2005; this date does not establish years in practice.
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Published CMS data list 23,850 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- J1071 — Injection, testosterone cypionate, 1 mg: 14,165 service units.
- J9030 — Bcg live intravesical instillation, 1 mg: 2,900 service units.
- 81002 — Urinalysis, manual test: 1,622 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 40 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 4,431 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Tamsulosin Hcl — 1,328 prescription fills, including refills.
- Finasteride — 1,030 prescription fills, including refills.
- Myrbetriq (Mirabegron) — 179 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 36 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under Urology in Illinois (2024, 313 clinicians with data). Median for this group: 1,869. Middle half: 703 to 4,858.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 12,742 in 2020 to 23,850 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
4109 S Water Tower Pl
Mount Vernon, IL 628646293
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Advanced Urologic Surgeons Pc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Columbia University College Of Physicians And Surgeons
1998
What Public CMS Data Show
Urology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
1,182 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $450,025 in 2024
The total amount Medicare approved for these services in 2024. 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, 2024.
Paid by Medicare
About $333,640 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, 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, 2024.
30-day fills
9,920 standardized 30-day fills in 2024
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
$1,193,029 in 2024
The total cost of these prescriptions in 2024, 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, 2024.
Open Payments general payments, program year 2025
All general payments: $970.00 across 50 records.
By nature of payment
- Food and Beverage: $970.00 across 50 records.
Reporting-company totals (3 largest of 19)
- Janssen Pharmaceuticals, Inc: $163.11 across 9 records.
- Pfizer Inc.: $91.31 across 5 records.
- Novartis Pharmaceuticals Corporation: $90.22 across 4 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
28 years (graduated 1998)
CMS Doctors and Clinicians data list 1998 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2005
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.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
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?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Knowles has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Knowles as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Mount Vernon and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Urology in Illinois (2024, 313 clinicians with data). Median for this group: 1,869. Middle half: 703 to 4,858.
Too few clinicians listed under Urology in Mount Vernon have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 90% of clinicians listed under Urology in Illinois (2024, 313 clinicians with data). Median for this group: $150,002. Middle half: $69,734 to $268,150.
Too few clinicians listed under Urology in Mount Vernon have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 90% of clinicians listed under Urology in Illinois (2024, 313 clinicians with data). Median for this group: $113,671. Middle half: $51,216 to $199,881.
Too few clinicians listed under Urology in Mount Vernon have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Urology in Illinois (2024, 381 clinicians with data). Median for this group: 813. Middle half: 123 to 1,932.
Too few clinicians listed under Urology in Mount Vernon have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 90% of clinicians listed under Urology in Illinois (2024, 381 clinicians with data). Median for this group: $79,867. Middle half: $8,053 to $301,934.
Too few clinicians listed under Urology in Mount Vernon have Medicare Part D data for 2024 to compare.
3 active clinicians are listed under Urology with a practice address in Mount Vernon, IL (629 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
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 increased 87% from 12,742 in 2020 to 23,850 in 2024.
- 2020: 12,742
- 2021: 10,823
- 2022: 31,873
- 2023: 28,521
- 2024: 23,850
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Medicare-allowed amount
Medicare-allowed amount decreased 13% from $516,326 in 2020 to $450,025 in 2024.
- 2020: $516,326
- 2021: $546,011
- 2022: $635,140
- 2023: $586,306
- 2024: $450,025
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Paid by Medicare
Paid by Medicare decreased 16% from $398,190 in 2020 to $333,640 in 2024.
- 2020: $398,190
- 2021: $420,583
- 2022: $488,549
- 2023: $447,410
- 2024: $333,640
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 33% from 3,328 in 2020 to 4,431 in 2024.
- 2020: 3,328
- 2021: 3,640
- 2022: 3,797
- 2023: 3,822
- 2024: 4,431
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30-day fills
30-day fills increased 39% from 7,121 in 2020 to 9,920 in 2024.
- 2020: 7,121
- 2021: 7,932
- 2022: 8,455
- 2023: 8,655
- 2024: 9,920
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Part D drug cost
Part D drug cost increased 80% from $662,178 in 2020 to $1,193,029 in 2024.
- 2020: $662,178
- 2021: $798,260
- 2022: $1,456,080
- 2023: $863,350
- 2024: $1,193,029
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Industry payments (Open Payments)
Industry payments (Open Payments) stayed about the same: $1,043.09 in 2021 and $970.00 in 2025.
- 2021: $1,043.09
- 2022: $1,181.82
- 2023: $1,018.12
- 2024: $1,031.89
- 2025: $970.00
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), 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 2025 (payments made January 1 – December 31, 2025): 50 records totaling $970.00.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
XTANDI | General | $27.65 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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PLUVICTO | General | $25.84 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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ADSTILADRIN | General | $25.51 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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PLUVICTO | General | $23.79 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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ADSTILADRIN | General | $23.71 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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ADSTILADRIN | General | $22.80 |
| Olympus America Inc. |
Food and Beverage
In-kind items and services
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iTIND System | General | $22.58 |
| Astellas Pharma US Inc |
Food and Beverage
In-kind items and services
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Xtandi | General | $22.34 |
| Endo USA, Inc. |
Food and Beverage
In-kind items and services
|
XIAFLEX | General | $22.29 |
| Sumitomo Pharma America, Inc. |
Food and Beverage
In-kind items and services
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ORGOVYX | General | $22.20 |
| Olympus America Inc. |
Food and Beverage
In-kind items and services
|
iTIND System | General | $22.10 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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ERLEADA | General | $21.96 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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PLUVICTO | General | $21.83 |
| Bayer Healthcare Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
|
Nubeqa | General | $21.24 |
| Astellas Pharma US Inc |
Food and Beverage
In-kind items and services
|
Xtandi | General | $21.02 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
|
ERLEADA | General | $20.94 |
| TOLMAR, INC. |
Food and Beverage
In-kind items and services
|
JATENZO | General | $20.94 |
| C. R. Bard, Inc. & Subsidiaries |
Food and Beverage
In-kind items and services
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Bard Urinary Drainage Bag | General | $20.76 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
LUPRON DEPOT | General | $20.71 |
| Endo USA, Inc. |
Food and Beverage
In-kind items and services
|
XIAFLEX | General | $20.47 |
| Calyxo, Inc. |
Food and Beverage
In-kind items and services
|
CVAC ASPIRATION SYSTEM | General | $19.67 |
| Sumitomo Pharma America, Inc. |
Food and Beverage
In-kind items and services
|
GEMTESA | General | $19.47 |
| TOLMAR, INC. |
Food and Beverage
In-kind items and services
|
JATENZO | General | $19.46 |
| Sumitomo Pharma America, Inc. |
Food and Beverage
In-kind items and services
|
ORGOVYX | General | $19.32 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
|
ERLEADA | General | $19.03 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, 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 2016–2023 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, 2017–2024; 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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J1071
Injection, testosterone cypionate, 1 mg
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14,165 | 13 | $0.15 | $0.02 |
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J9030
Bcg live intravesical instillation, 1 mg
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2,900 | 11 | $6.20 | $2.88 |
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81002
Urinalysis, manual test
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1,622 | 1,045 | $23.00 | $3.38 |
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J0897
Injection, denosumab, 1 mg
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1,380 | 13 | $33.00 | $25.64 |
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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
|
665 | 454 | $205.00 | $85.30 |
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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
|
658 | 518 | $271.00 | $121.71 |
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J9217
Leuprolide acetate (for depot suspension), 7.5 mg
|
316 | 39 | $470.00 | $178.10 |
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J9201
Injection, gemcitabine hydrochloride, not otherwise specified, 200 mg
|
270 | 13 | $20.00 | $3.00 |
|
52000
Diagnostic exam of bladder and urethra using an endoscope
|
249 | 204 | $1005.00 | $220.90 |
|
51798
Ultrasound measurement of bladder capacity after voiding
|
167 | 146 | $101.00 | $10.23 |
|
96372
Injection of drug or substance under skin or into muscle
|
163 | 31 | $30.00 | $13.47 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
|
139 | 116 | $380.00 | $170.93 |
|
51720
Instillation of anti-cancer drug into bladder
|
115 | 20 | $387.00 | $79.22 |
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J1580
Injection, garamycin, gentamicin, up to 80 mg
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114 | 56 | $6.50 | $2.53 |
|
99441
Telephone medical discussion with physician, 5-10 minutes
|
109 | 86 | $126.00 | $52.82 |
|
96402
Administration of hormonal anti-neoplastic chemotherapy under skin or into muscle
|
106 | 39 | $140.00 | $32.48 |
|
74420
Imaging of urinary tract following injection of a contrast agent
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88 | 75 | $57.00 | $22.91 |
|
76872
Ultrasound scan of pelvic region through rectum
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60 | 59 | $449.00 | $125.63 |
|
55700
Biopsy of prostate gland
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50 | 50 | $851.00 | $225.86 |
|
99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
|
44 | 44 | $425.00 | $155.12 |
|
99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
|
43 | 43 | $310.00 | $107.01 |
|
99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
|
42 | 36 | $348.00 | $167.30 |
|
52356
Crushing of stone of ureter with insertion of stent using an endoscope
|
40 | 39 | $4015.00 | $423.21 |
|
52310
Simple removal of foreign body, stone, or stent in urethra or bladder using an endoscope
|
37 | 36 | $921.00 | $292.12 |
|
51700
Simple bladder irrigation and/or instillation
|
36 | 29 | $272.00 | $70.49 |
(top 25 shown)
Source: CMS Part B by Provider and Service, 2024; 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 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Tamsulosin Hcl | Tamsulosin Hcl | 1,328 | 104,849 | $26,128.49 | 424 |
| Finasteride | Finasteride | 1,030 | 82,092 | $15,100.45 | 291 |
| Myrbetriq | Mirabegron | 179 | 8,850 | $131,399.19 | 44 |
| Dutasteride | Dutasteride | 178 | 15,299 | $5,706.86 | 60 |
| Testosterone Cypionate | Testosterone Cypionate | 171 | 11,109 | $6,749.14 | 53 |
| Testosterone | Testosterone | 164 | 6,264 | $32,917.00 | 37 |
| Solifenacin Succinate | Solifenacin Succinate | 150 | 9,955 | $7,367.30 | 62 |
| Cephalexin | Cephalexin | 137 | 3,755 | $1,167.52 | 84 |
| Levofloxacin | Levofloxacin | 119 | 1,303 | $957.01 | 92 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 111 | 572 | $665.64 | 81 |
| Potassium Citrate Er | Potassium Citrate | 109 | 7,559 | $11,488.40 | 35 |
| Gemtesa | Vibegron | 92 | 4,776 | $77,202.60 | 26 |
| Clotrimazole-Betamethasone | Clotrimazole/Betamethasone Dip | 63 | 1,490 | $1,790.59 | 30 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 57 | 878 | $325.64 | 37 |
| Hydrochlorothiazide | Hydrochlorothiazide | 56 | 3,966 | $283.19 | 14 |
| Silodosin | Silodosin | 47 | 3,510 | $4,043.29 | 18 |
| Betamethasone Diprop Augmented | Betamethasone/Propylene Glyc | 38 | 941 | $720.25 | 20 |
| Estradiol | Estradiol | 36 | 3,316 | $2,417.86 | 19 |
| Bethanechol Chloride | Bethanechol Chloride | 36 | 1,135 | $997.78 | — |
| Alfuzosin Hcl Er | Alfuzosin Hcl | 35 | 3,150 | $1,370.48 | 15 |
| Xtandi | Enzalutamide | 33 | 990 | $464,845.91 | — |
| Cefdinir | Cefdinir | 30 | 238 | $387.45 | 25 |
| Nitrofurantoin Mono-Macro | Nitrofurantoin Monohyd/M-Cryst | 29 | 886 | $804.34 | — |
| Allopurinol | Allopurinol | 23 | 1,947 | $261.34 | — |
| Betamethasone Dipropionate | Betamethasone Dipropionate | 22 | 437 | $688.74 | — |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; 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
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - UROLOGY
I20060131000700
IL
5991719858
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Advanced Urologic Surgeons Pc
4109 S Water Tower Pl, Mount Vernon, IL 628646293
Phone: 6182444060
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 - Acute Care
APNBCACNP
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
NPI status registered as active in NPPES database
Registered at 4109 S WATER TOWER PL, MOUNT VERNON, IL 628646293 (Tel: 6182444060)
Registered at 4109 S WATER TOWER PL, MOUNT VERNON, IL 628646293 (Tel: 6182444060)
Recorded as DAVID KNOWLES, MD
Urology (license number reported to NPPES: IL 036114878)
NPI status registered as active in NPPES database
Registered at 604 SEVILLE DR, MOUNT VERNON, IL 628647001 (Tel: 6182444060)
Registered at 604 SEVILLE DR, MOUNT VERNON, IL 628647001 (Tel: 6182444060)
Recorded as DAVID KNOWLES, MD
Urology
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Urology Specialists in Mount Vernon
Healthcare providers in Mount VernonMailing Address
4109 S Water Tower Pl
Mount Vernon, IL 628646293
Phone: 6182444060