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Active NPI 1114181658 Individual Practitioner Male Practitioner

Dr. Mark Loren Keldahl , MD

Surgery - Vascular Surgery • Chicago, IL

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Mark Keldahl, MD is a certified Surgery - Vascular Surgery practicing in Chicago, IL. With approximately 22 years of clinical experience since graduating from Rush Medical College Of Rush University in 2004, Dr. Keldahl delivers high-quality medical care to the local community at 3000 N. HALSTED ST..

Dr. Keldahl is affiliated with Advocate Health And Hospitals Corporation and accepts Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include established patient outpatient office visit, subsequent hospital care with moderate levelof medical decision making, if using time, at least, new patient outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

3000 N. Halsted St.
Suite 703

Chicago, IL 60657

Telephone 7732963390
Fax 7732967531
Associated Practice Facility / Clinic

Medicare Profile & Education

Medical School

Rush Medical College Of Rush University

Graduation Year

2004

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Surgery - Vascular Surgery in Chicago, IL

Senior Veteran Specialist (>20 Yrs)
Practitioner Clinical Experience
22 Yrs -1.0 yrs vs City Avg
City Avg: 23.0 Yrs
State Avg: 23.8 Yrs
Regional Practice Density
53 Specialists

Practicing in Chicago, IL (207 Statewide)

Telehealth Adoption Rate
24.5% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount
64.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Keldahl (22 Years) 22 Yrs
Chicago Specialty Average (23.0 Years) 23.0 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)
Reporting Year:
HCPCS Code & Description Services Patients Submitted Charge Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes
346 63 $198.00 $67.36
99213 Established patient office or other outpatient visit, typically 15 minutes
157 118 $198.00 $93.62
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
131 53 $177.00 $80.06
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
74 74 $249.00 $116.33
15271 Application of skin substitute graft to wound of trunk, arms, or legs, 25.0 sq cm or less of wound 100.0 sq cm or less
62 12 $562.00 $89.99
99221 Initial hospital inpatient care per day, typically 30 minutes
41 35 $247.34 $82.97
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
31 31 $249.00 $85.87
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
29 25 $279.00 $131.38
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
24 23 $315.00 $135.85
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
20 20 $370.00 $174.24
11042 Removal of skin and tissue, 20.0 sq cm or less
20 12 $310.00 $59.75

Medical Specialties & State Licenses

CMS Verified: 2026-06-25
Surgery - Vascular Surgery Primary Specialty

NUCC Taxonomy Code: 2086S0129X

State License IL 036-117220

A surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.

Surgery - Vascular Surgery

NUCC Taxonomy Code: 2086S0129X

State License TN 59517

A surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.

Surgery

NUCC Taxonomy Code: 208600000X

State License IL 036-117220

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.

Surgery

NUCC Taxonomy Code: 208600000X

State License IL 036117220

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.

Hospital & Practice Group Affiliations

Advocate Health And Hospitals Corporation

1775 Dempster St, Park Ridge, IL 600681143

Advocate Health And Hospitals Corporation

3815 Highland Ave, Downers Grove, IL 605151500

Advocate Health And Hospitals Corporation

3000 N Halsted St, Chicago, IL 606576185

Phone: 7732967150

Advocate Health And Hospitals Corporation

214 Mchenry Rd, Buffalo Grove, IL 600896748

Phone: 8474591160

Advocate Health And Hospitals Corporation

836 W Wellington Ave, Chicago, IL 606575147

Advocate Health And Hospitals Corporation

836 W Wellington, Chicago, IL 606575147

Phone: 7732967147

Secondary Practice Locations

1325 Eastmoreland Ave Ste 365

Memphis, TN 381047542

Phone: 9012726018

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

13 Associated Practitioners
Lindsey Ploskonka , PA-C

Physician Assistant

NPI 1023771177

Physician Assistant (Certified)

NPI 1104116847

Doctor of Medicine (M.D.)

NPI 1215270178

Doctor of Medicine (M.D.)

Dr. Nicholas Lysak , MD

Surgery - Vascular Surgery

NPI 1477972297

Doctor of Medicine (M.D.)

Dr. Rosalinda Alvarado , MD

Surgery - Surgical Oncology

NPI 1649564980

Doctor of Medicine (M.D.)

NPI 1700142528

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

9 Historical Events
📍
Updated Business Mailing Address March 25, 2025

Registered at 29373 NETWORK PL, CHICAGO, IL 606731293 (Tel: 8473905900)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) March 25, 2025

Surgery (License #59517 in TN)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) December 29, 2021

Surgery (License #036117220 in IL)

NPI Profile Active September 26, 2011

NPI status registered as active in NPPES database

📍
Updated Practice Location September 26, 2011

Registered at 3000 N. HALSTED ST., SUITE 703, CHICAGO, IL 60657 (Tel: 7732963390)

📍
Updated Business Mailing Address September 26, 2011

Registered at 3000 N. HALSTED ST., SUITE 703, CHICAGO, IL 60657 (Tel: 7732963390)

👤
Provider Name / Credentials Updated September 26, 2011

Recorded as MARK KELDAHL, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) September 26, 2011

Surgery (License #036-117220 in IL)

🟢
Initial NPI Registration & Enumeration July 14, 2008

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1114181658
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: July 14, 2008
Last Update: June 25, 2026
Sole Proprietor: No

Mailing Address

29373 Network Pl

Chicago, IL 606731293

Phone: 8473905900

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.