Dr. Mark Keldahl, MD
What this data tells you about Dr. Keldahl
Dr. Mark Keldahl is a vascular surgery physician in Chicago, IL, with 18 years of NPI registration. Based on federal Medicare data, Dr. Keldahl performed 833 Medicare services across 620 unique beneficiaries.
Between the years covered by Open Payments, Dr. Keldahl received a total of $712,095 from 20 pharmaceutical and/or device companies across 251 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in vascular surgery physician. The majority of payments are for consulting, which typically reflects recognized clinical expertise sought by manufacturers. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Keldahl is Very High — reflecting how much public federal data is available about this provider. 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 |
|---|---|---|---|
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
212 | $68 | $178 |
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
189 | $64 | $168 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
91 | $83 | $237 |
| Initial hospital admission, low complexity Initial hospital inpatient or observation care for a new patient involving straightforward or low-level medical decision making, with at least 40 minutes total time on the date of the encounter. |
64 | $70 | $231 |
| Ultrasound of arm or leg veins An ultrasound exam of the veins in the arm or leg. The test uses sound waves to check blood flow and may include compression and other maneuvers. |
37 | $25 | $124 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
37 | $90 | $257 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
37 | $106 | $303 |
| Skin and tissue removal, 20 sq cm or less This procedure involves the surgical excision of skin and underlying tissue from an area measuring 20 square centimeters or smaller. |
32 | $46 | $310 |
| Ultrasound of arm or leg veins An ultrasound exam of the veins in one arm or leg using compression and other maneuvers to assess blood flow and check for blockages. |
26 | $16 | $79 |
| Ultrasound of head and neck blood flow, bilateral An ultrasound exam that uses sound waves to visualize and assess blood flow in the vessels of both the head and the neck. |
23 | $29 | $103 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
22 | $112 | $352 |
| Radiologist review of arm or leg artery image A radiologist reviews images of the arteries in the arm or leg. This process involves analyzing the visual data to assess the blood vessels. |
19 | $69 | $231 |
| Ultrasound of leg arteries or grafts An imaging test that uses sound waves to create pictures of the blood vessels in the legs or any surgical grafts present. |
17 | $31 | $132 |
| Radiologist review of abdominal aorta image A radiologist reviews images of the abdominal aorta to evaluate the blood vessel. |
15 | $58 | $256 |
| Arteriovenous graft creation for hemodialysis Surgical procedure to create a connection between an artery and a vein using a synthetic tube graft to provide access for hemodialysis. |
12 | $595 | $3,111 |
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)
All-time payments by company (2018-2024) ›
Associated products mentioned in payments ›
The majority of payments (98%) are consulting fees, which typically reflect recognized clinical expertise sought by manufacturers. Total industry engagement is in the top 1% for vascular surgery physician in IL.
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 reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Keldahl is a clinical cardiology specialist, with moderate Medicare volume, with consulting-driven industry engagement in the top 1% of IL peers, with 18 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
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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. Data Coverage reflects 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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