Dr. Mark Thomas Vandenberg , MD
Surgery • Ames, IA
1215 Duff Ave
Ames, IA 500103014
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 November 15, 2005; this date does not establish years in practice.
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Published CMS data list 130 Original Medicare Part B services in 2023.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2023. Published rows only; this is not a quality measure.
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Published Part B service records, 2023:
- 11042 — Removal of skin and tissue, 20.0 sq cm or less: 70 service units.
- 99221 — Initial hospital care with straightforward or low level of medical decision making, per day: 32 service units.
- 99231 — Subsequent hospital care with straightforward or low level of medical decision making, per day: 15 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2023. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2022 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2023). CPT notice
See all 4 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 19 Medicare Part D prescriptions, including refills, in 2022.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022. Published rows only; this is not a quality measure.
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Published Part D records, 2022:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 19 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022. 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 350 in 2019 to 130 in 2023.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2019–2023.
Practice Location & Contact Primary Location
1215 Duff Ave
Ames, IA 500103014
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
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $7,526 in 2023
The total amount Medicare approved for these services in 2023. 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, 2023.
Paid by Medicare
About $5,953 in 2023
The part of the Medicare-allowed amount that Medicare itself paid in 2023, 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, 2023.
30-day fills
19 standardized 30-day fills in 2022
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
$103 in 2022
The total cost of these prescriptions in 2022, 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, 2022.
Open Payments general payments, program year 2023
All general payments: $29.55 across 2 records.
By nature of payment
- Food and Beverage: $29.55 across 2 records.
Reporting-company totals
- Kerecis Limited: $15.54 across 1 record.
- Smith+Nephew, Inc.: $14.01 across 1 record.
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 2023 (published June 30, 2026).
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.
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 Ames and Iowa
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Vandenberg are from 2023.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Vandenberg are from 2022.
6 active clinicians are listed under Surgery with a practice address in Ames, IA (437 in Iowa).
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 decreased 63% from 350 in 2019 to 130 in 2023.
- 2019: 350
- 2020: 224
- 2021: 509
- 2022: 211
- 2023: 130
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Medicare-allowed amount
Medicare-allowed amount decreased 66% from $22,194 in 2019 to $7,526 in 2023.
- 2019: $22,194
- 2020: $12,820
- 2021: $45,104
- 2022: $11,949
- 2023: $7,526
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Paid by Medicare
Paid by Medicare decreased 66% from $17,337 in 2019 to $5,953 in 2023.
- 2019: $17,337
- 2020: $9,857
- 2021: $35,130
- 2022: $9,181
- 2023: $5,953
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 34% from 29 in 2018 to 19 in 2022.
- 2018: 29
- 2019: 22
- 2020: 37
- 2021: 36
- 2022: 19
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30-day fills
30-day fills decreased 34% from 29 in 2018 to 19 in 2022.
- 2018: 29
- 2019: 22
- 2020: 37
- 2021: 36
- 2022: 19
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Part D drug cost
Part D drug cost went from $190 in 2018 to $103 in 2022.
- 2018: $190
- 2019: $97
- 2020: $179
- 2021: $229
- 2022: $103
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $31.55 in 2019 to $29.55 in 2023.
- 2019: $31.55
- 2022: $13.44
- 2023: $29.55
Sources: CMS Medicare Physician & Other Practitioners (2023), CMS Medicare Part D Prescribers (2022), CMS Open Payments (2023), 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 2023 (payments made January 1 – December 31, 2023): fewer than 11 records totaling $29.55.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Kerecis Limited |
Food and Beverage
Cash or cash equivalent
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Kerecis Omega3 SurgiClose | General | $15.54 |
| Smith+Nephew, Inc. |
Food and Beverage
In-kind items and services
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COLLAGENASE SANTYL | General | $14.01 |
Source: CMS Open Payments, program year 2023, 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 2016–2022 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, 2017–2023; 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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11042
Removal of skin and tissue, 20.0 sq cm or less
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70 | 24 | $302.82 | $55.49 |
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99221
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes
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32 | 32 | $176.00 | $78.15 |
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99231
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes
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15 | 12 | $68.00 | $46.90 |
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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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13 | 12 | $81.00 | $33.63 |
Source: CMS Part B by Provider and Service, 2023; 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 2022.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 19 | 64 | $103.00 | 19 |
Source: CMS Part D by Provider and Drug, 2022; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-09-07NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
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.
Physician Assistant - Surgical
Physician Assistant (Certified)
Podiatrist
Doctor of Podiatric Medicine
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated November 15, 2005.
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 Surgery Specialists in Ames
- Dr. Mark Taylor, MD
- Dr. Justin Davis, MD
- Dr. Benjamin Schlicher, MD
- Dr. Gregory Sachs, MD
- Dr. Alexander Wickenkamp, MD
Mailing Address
1215 Duff Ave
Ames, IA 500103014
Phone: 5152394725