Dr. Shon Thomas , MD
Internal Medicine β’ Deerfield, IL
49 S Waukegan Rd Ste 100
Deerfield, IL 600155204
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 May 15, 2022; this date does not establish years in practice.
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Published CMS data list 160 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Atorvastatin Calcium β 52 prescription fills, including refills.
- Amlodipine Besylate β 35 prescription fills, including refills.
- Lisinopril β 20 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 7 records in the table Β· Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 75% of clinicians listed under Internal Medicine in Deerfield, IL (2024, 14 clinicians with data). Median for this group: 2,700. Middle half: 205 to 4,238.
Fewer Part D prescriptions than 65% of clinicians listed under Internal Medicine in Illinois (2024, 3,708 clinicians with data). Median for this group: 1,080. Middle half: 101 to 4,782.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 290 in 2023 to 160 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2023β2024.
Practice Location & Contact Primary Location
49 S Waukegan Rd Ste 100
Deerfield, IL 600155204
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Saint Joseph, MI. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Endeavor Health Medical Group. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Loyola University Of Chicago, Stritch School Of Medicine
2022
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
356 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
$2,359 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 β by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $121.86 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
Years since graduation
4 years (graduated 2022)
CMS Doctors and Clinicians data list 2022 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, CMS release of October 2, 2026.
NPI first issued
2022
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, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
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, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Dr. Thomas 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. Thomas 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 Deerfield and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 75% of clinicians listed under Internal Medicine in Deerfield, IL (2024, 14 clinicians with data). Median for this group: 2,700. Middle half: 205 to 4,238.
Fewer Part D prescriptions than 65% of clinicians listed under Internal Medicine in Illinois (2024, 3,708 clinicians with data). Median for this group: 1,080. Middle half: 101 to 4,782.
Part D drug cost
A lower Part D drug cost than 80% of clinicians listed under Internal Medicine in Deerfield, IL (2024, 14 clinicians with data). Median for this group: $143,612. Middle half: $26,836 to $366,637.
A lower Part D drug cost than 75% of clinicians listed under Internal Medicine in Illinois (2024, 3,708 clinicians with data). Median for this group: $82,134. Middle half: $2,821 to $375,574.
21 active clinicians are listed under Internal Medicine with a practice address in Deerfield, IL (7,195 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Deerfield
42.9% of these 21 clinicians have the CMS telehealth indicator.
61.9% of these 21 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 45% from 290 in 2023 to 160 in 2024.
- 2023: 290
- 2024: 160
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30-day fills
30-day fills decreased 38% from 572 in 2023 to 356 in 2024.
- 2023: 572
- 2024: 356
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Part D drug cost
Part D drug cost decreased 45% from $4,322 in 2023 to $2,359 in 2024.
- 2023: $4,322
- 2024: $2,359
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $83.23 in 2023 to $121.86 in 2025.
- 2023: $83.23
- 2024: $62.65
- 2025: $121.86
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· 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 β December 31, 2025): fewer than 11 records totaling $121.86.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
|
Kerendia | General | $121.86 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
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 |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 52 | 3,840 | $835.19 | 19 |
| Amlodipine Besylate | Amlodipine Besylate | 35 | 2,430 | $292.94 | 16 |
| Lisinopril | Lisinopril | 20 | 1,500 | $169.38 | β |
| Levothyroxine Sodium | Levothyroxine Sodium | 15 | 930 | $200.79 | β |
| Olmesartan-Hydrochlorothiazide | Olmesartan/Hydrochlorothiazide | 14 | 840 | $457.75 | β |
| Chlorthalidone | Chlorthalidone | 12 | 660 | $153.31 | β |
| Ezetimibe | Ezetimibe | 12 | 480 | $249.67 | β |
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
Self-certified to NPPES: 2025-08-14NUCC Taxonomy Code: 207R00000X
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.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20250826003213
IL
6002295201
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, CMS release of October 2, 2026
Endeavor Health Medical Group
1300 Oak Ave, Evanston, IL 602014205
Phone: 8478691300
Endeavor Health Medical Group
2100 Pfingsten Rd, Glenview, IL 600261301
Endeavor Health Medical Group
2650 Ridge Ave, Evanston, IL 602011700
Endeavor Health Medical Group
767 Park Ave W, Highland Park, IL 600352433
Phone: 8479266810
Endeavor Health Medical Group
777 Park Ave W, Highland Park, IL 600352433
Secondary Practice Locations
1234 Napier Ave
Saint Joseph, MI 490852112
Phone: 2699824941
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Obstetrics & Gynecology
Doctor of Medicine (M.D.)
Nurse Practitioner
APNCNP
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 49 S WAUKEGAN RD STE 100, DEERFIELD, IL 600155204 (Tel: 8479454575)
Registered at 2650 RIDGE AVE STE 1223, EVANSTON, IL 602011700 (Tel: 8475702040)
Additional practice office at 1234 Napier Ave, Saint Joseph, MI 490852112
Recorded as SHON THOMAS, MD
Internal Medicine (license number reported to NPPES: IL 036173743)
NPI status registered as active in NPPES database
Registered at 1234 NAPIER AVE, SAINT JOSEPH, MI 490852112 (Tel: 2699824941)
Registered at 8338 GROSS POINT RD, MORTON GROVE, IL 60053
Recorded as SHON THOMAS
Internal Medicine (license number reported to NPPES: IL STUDENT)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Deerfield
- Dr. Barry Rapaport, MD
- Dr. Jeffrey Foreman, MD
- Dr. Victoria Amesbury, MD
- Dr. Manu Chander, MD
- Dr. Carol Marinch, MD
- Dr. Jonathan Brown, MD
Mailing Address
2650 Ridge Ave Ste 1223
Evanston, IL 602011700
Phone: 8475702040