Active NPI 1477517373 Individual Practitioner Male Practitioner

Dr. Thomas Edwin Klarquist , MD

Internal Medicine • Chicago, IL

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Thomas Klarquist, MD is a certified Internal Medicine practicing in Chicago, IL. With approximately 39 years of clinical experience since graduating from Michigan State University College Of Human Medicine in 1987, Dr. Klarquist delivers high-quality medical care to the local community at 3134 N CLARK ST.

Dr. Klarquist 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, insertion of needle into vein for collection of blood sample, annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

3134 N Clark St

Chicago, IL 606574414

Telephone 7732965090

Fax 3127664908

Associated Practice Facility / Clinic

🏢 Advocate Health And Hospitals Corporation Facility NPI 1871364737

Medicare Profile & Education

Medical School

Michigan State University College Of Human Medicine

Graduation Year

1987

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Chicago, IL

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

39 Yrs +17.2 yrs vs City Avg

City Avg: 21.8 Yrs

State Avg: 28.9 Yrs

Regional Practice Density

2969 Specialists

Practicing in Chicago, IL (7544 Statewide)

Telehealth Adoption Rate

12.8% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

53.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Klarquist (39 Years) 39 Yrs

Chicago Specialty Average (21.8 Years) 21.8 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
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	235	136	$279.00	$130.08
36415 Insertion of needle into vein for collection of blood sample	228	140	$22.00	$8.42
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	107	107	$332.00	$129.56
99213 Established patient office or other outpatient visit, typically 15 minutes	86	73	$198.00	$93.25
G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's	41	37	$35.00	$16.87
90662 Influenza vaccine split virus, preservative free	34	34	$125.00	$76.13
G0008 Administration of influenza virus vaccine	34	34	$60.00	$33.70
83036 Hemoglobin A1C level	33	19	$68.00	$8.94
90480 Admn sarscov2 vacc 1 dose	30	27	$85.00	$41.94
91322 Sarscov2 vac 50 mcg/0.5ml im	30	27	$250.00	$144.26
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	16	16	$371.00	$169.83
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	14	14	$489.29	$288.14
G0009 Administration of pneumococcal vaccine	14	14	$60.00	$33.70
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	13	13	$498.00	$156.73

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	222	121	$259.00	$131.10
36415 Insertion of needle into vein for collection of blood sample	177	121	$22.00	$8.16
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	111	111	$317.42	$131.37
99213 Established patient office or other outpatient visit, typically 15 minutes	69	56	$178.00	$94.64
G0008 Administration of influenza virus vaccine	41	41	$53.76	$32.05
G0009 Administration of pneumococcal vaccine	41	41	$45.61	$32.05
90662 Influenza vaccine split virus, preservative free	39	39	$111.54	$71.93
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	35	35	$378.31	$282.06
83036 Hemoglobin A1C level	26	17	$68.00	$9.52
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	18	15	$63.00	$24.04
93000 Routine ekg using at least 12 leads including interpretation and report	13	13	$82.00	$15.38

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	204	122	$235.00	$133.30
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	109	109	$316.00	$130.88
99213 Established patient office or other outpatient visit, typically 15 minutes	46	36	$161.00	$96.56
G0008 Administration of influenza virus vaccine	42	41	$41.00	$30.36
90662 Influenza vaccine split virus, preservative free	32	32	$73.00	$66.40
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	20	20	$474.00	$175.98
93000 Routine ekg using at least 12 leads including interpretation and report	18	15	$82.00	$14.60
83036 Hemoglobin A1C level	18	14	$68.00	$9.55
G0009 Administration of pneumococcal vaccine	14	14	$41.00	$31.23

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	225	114	$223.91	$137.88
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	73	73	$316.00	$141.06
99213 Established patient office or other outpatient visit, typically 15 minutes	43	34	$153.00	$97.92
G0008 Administration of influenza virus vaccine	42	41	$41.00	$17.97
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	36	35	$37.00	$20.50
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	15	15	$474.00	$178.01
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	14	14	$159.00	$125.49
G0009 Administration of pneumococcal vaccine	13	13	$41.00	$17.96
93000 Routine ekg using at least 12 leads including interpretation and report	11	11	$82.00	$16.05

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	211	122	$212.95	$115.29
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	40	40	$316.00	$119.83
G0008 Administration of influenza virus vaccine	36	36	$41.00	$17.74
99213 Established patient office or other outpatient visit, typically 15 minutes	26	25	$146.00	$77.30
G0009 Administration of pneumococcal vaccine	21	21	$41.00	$17.70
90662 Influenza vaccine split virus, preservative free	20	20	$69.00	$57.93
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	17	17	$36.88	$19.53
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	16	16	$155.13	$111.43
99442 Telephone medical discussion with physician, 11-20 minutes	12	11	$102.00	$79.37

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	296	133	$212.97	$114.17
G0008 Administration of influenza virus vaccine	42	42	$41.00	$17.33
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	37	37	$35.00	$18.65
G0009 Administration of pneumococcal vaccine	33	33	$41.00	$17.34
90670 Pneumococcal vaccine for injection into muscle	22	22	$318.00	$210.56
99213 Established patient office or other outpatient visit, typically 15 minutes	20	20	$146.00	$78.80
93000 Routine ekg using at least 12 leads including interpretation and report	12	12	$82.00	$16.74
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	11	11	$150.91	$111.93

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	256	126	$197.69	$111.70
99213 Established patient office or other outpatient visit, typically 15 minutes	42	36	$134.05	$77.07
G0008 Administration of influenza virus vaccine	25	25	$41.00	$21.46
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	20	20	$35.00	$17.72
93000 Routine ekg using at least 12 leads including interpretation and report	15	15	$79.87	$16.89

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	155	88	$184.00	$112.54
99213 Established patient office or other outpatient visit, typically 15 minutes	86	62	$129.00	$76.49
G0008 Administration of influenza virus vaccine	31	31	$41.00	$26.65
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	30	26	$247.00	$152.71
90662 Influenza vaccine split virus, preservative free	23	23	$60.00	$47.78

Medical Specialties & State Licenses

CMS Verified: 2025-03-26

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License IL 036100647

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Hospital & Practice Group Affiliations

Advocate Health And Hospitals Corporation

214 Mchenry Rd, Buffalo Grove, IL 600896748

Phone: 8474591160

Advocate Health And Hospitals Corporation

3134 N Clark St, Chicago, IL 606574414

Phone: 7732965420

Advocate Health And Hospitals Corporation

3936 N Milwaukee Ave, Chicago, IL 606412703

Phone: 7737366125

Secondary Practice Locations

1695 N Sunrise Way

Palm Springs, CA 922623701

Phone: 7603232118

Practice Associates & Co-Workers

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

28 Associated Practitioners

Olivia Vetter

Anesthesiology

NPI 1053974584

Dr. Paul Ringel , MD

Internal Medicine

NPI 1063454056

Doctor of Medicine (M.D.)

Zachary Kirkpatrick

Nurse Anesthetist, Certified Registered

NPI 1083339196

Dr. Samuel Goodman , MD

Internal Medicine - Pulmonary Disease

NPI 1134500283

Doctor of Medicine (M.D.)

Dr. Aladino De Ranieri , MD, PhD

Anesthesiology

NPI 1154577591

Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)

Jordan Chen

Anesthesiology

NPI 1154852796

Career & Practice History Timeline

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

10 Historical Events

📍

Updated Business Mailing Address May 26, 2022

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

📍

Updated Practice Location April 11, 2022

Registered at 3134 N CLARK ST, CHICAGO, IL 606574414 (Tel: 7732965090)

📍

Updated Practice Location April 25, 2018

Registered at 3000 N HALSTED ST STE 509, CHICAGO, IL 606575194 (Tel: 7732965090)

📍

Updated Business Mailing Address April 25, 2018

Registered at 3450 N LAKE SHORE DR APT 3701, CHICAGO, IL 606572865 (Tel: 7733543833)

✅

NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍

Updated Practice Location July 08, 2007

Registered at 111 N WABASH AVE, SUITE 600, CHICAGO, IL 606021903 (Tel: 3123320844)

📍

Updated Business Mailing Address July 08, 2007

Registered at 111 N WABASH AVE, SUITE 600, CHICAGO, IL 606021903 (Tel: 3123320844)

👤

Provider Name / Credentials Updated July 08, 2007

Recorded as THOMAS KLARQUIST, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Internal Medicine (License #036100647 in IL)

🟢

Initial NPI Registration & Enumeration April 17, 2006

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: 1477517373

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: April 17, 2006

Last Update: March 26, 2025

Sole Proprietor: Yes

Update or Correct Profile

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.