Dr. Linus Ema , DO
Internal Medicine โข Chicago, IL
2535 S King Dr
Chicago, IL 606164746
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 July 9, 2006; this date does not establish years in practice.
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Published CMS data list 707 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 255 service units.
- 36415 โ Insertion of needle into vein for collection of blood sample: 165 service units.
- 93793 โ Anticoagulant management of patient taking warfarin: 57 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 11 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 6,103 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ 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 โ 362 prescription fills, including refills.
- Metoprolol Succinate โ 255 prescription fills, including refills.
- Amlodipine Besylate โ 253 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 111 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 65% of clinicians listed under Internal Medicine in Chicago, IL (2024, 1,008 clinicians with data). Median for this group: 406. Middle half: 157 to 820.
Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: 699. Middle half: 285 to 1,340.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 813 in 2020 to 707 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
2535 S King Dr
Chicago, IL 606164746
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Advocate Health And Hospitals Corporation. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
1989
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
121 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $51,582 in 2024
The total amount Medicare approved for these services in 2024. 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 โ by Provider and Service, 2024.
Paid by Medicare
About $39,355 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, 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 โ by Provider and Service, 2024.
30-day fills
14,282 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
$443,734 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 โ by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $48.35 across 2 records.
By nature of payment
- Food and Beverage: $48.35 across 2 records.
Reporting-company totals
- Eli Lilly and Company: $29.27 across 1 record.
- Edwards Lifesciences Corporation: $19.08 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 2025 (published June 30, 2026).
Years since graduation
37 years (graduated 1989)
CMS Doctors and Clinicians data list 1989 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.
NPI first issued
2006
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; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Ema 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. Ema 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 Chicago and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 65% of clinicians listed under Internal Medicine in Chicago, IL (2024, 1,008 clinicians with data). Median for this group: 406. Middle half: 157 to 820.
Close to the middle for clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: 699. Middle half: 285 to 1,340.
Medicare-allowed amount
Close to the middle for clinicians listed under Internal Medicine in Chicago, IL (2024, 1,008 clinicians with data). Median for this group: $41,573. Middle half: $14,662 to $79,189.
A lower Medicare-allowed amount than 60% of clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: $67,802. Middle half: $27,619 to $124,679.
Paid by Medicare
Close to the middle for clinicians listed under Internal Medicine in Chicago, IL (2024, 1,008 clinicians with data). Median for this group: $31,519. Middle half: $10,954 to $62,185.
A lower Medicare payment amount than 60% of clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: $52,838. Middle half: $21,117 to $98,214.
Medicare Part D prescriptions
More Part D prescriptions than 90% of clinicians listed under Internal Medicine in Chicago, IL (2024, 1,269 clinicians with data). Median for this group: 474. Middle half: 74 to 2,358.
More Part D prescriptions than 80% of clinicians listed under Internal Medicine in Illinois (2024, 3,755 clinicians with data). Median for this group: 1,030. Middle half: 99 to 4,658.
Part D drug cost
A higher Part D drug cost than 85% of clinicians listed under Internal Medicine in Chicago, IL (2024, 1,269 clinicians with data). Median for this group: $40,678. Middle half: $1,543 to $232,098.
A higher Part D drug cost than 75% of clinicians listed under Internal Medicine in Illinois (2024, 3,755 clinicians with data). Median for this group: $78,716. Middle half: $2,604 to $371,507.
2,870 active clinicians are listed under Internal Medicine with a practice address in Chicago, IL (7,245 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
13.3% of these 2,870 clinicians have the CMS telehealth indicator.
38.5% of these 2,870 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 B services
Medicare Part B services decreased 13% from 813 in 2020 to 707 in 2024.
- 2020: 813
- 2021: 755
- 2022: 868
- 2023: 679
- 2024: 707
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Medicare-allowed amount
Medicare-allowed amount stayed about the same: $47,702 in 2020 and $51,582 in 2024.
- 2020: $47,702
- 2021: $56,022
- 2022: $51,042
- 2023: $50,935
- 2024: $51,582
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Paid by Medicare
Paid by Medicare increased 19% from $32,972 in 2020 to $39,355 in 2024.
- 2020: $32,972
- 2021: $40,362
- 2022: $39,210
- 2023: $37,999
- 2024: $39,355
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 11% from 6,858 in 2020 to 6,103 in 2024.
- 2020: 6,858
- 2021: 6,530
- 2022: 6,354
- 2023: 5,912
- 2024: 6,103
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30-day fills
30-day fills stayed about the same: 14,700 in 2020 and 14,282 in 2024.
- 2020: 14,700
- 2021: 14,696
- 2022: 14,619
- 2023: 13,997
- 2024: 14,282
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Part D drug cost
Part D drug cost varied from year to year: $440,074 in 2020 and $443,734 in 2024.
- 2020: $440,074
- 2021: $414,900
- 2022: $535,801
- 2023: $533,668
- 2024: $443,734
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $74.33 in 2021 to $48.35 in 2025.
- 2021: $74.33
- 2022: $28.35
- 2023: $20.00
- 2024: $56.36
- 2025: $48.35
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท 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 โ December 31, 2025): fewer than 11 records totaling $48.35.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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JARDIANCE | General | $29.27 |
| Edwards Lifesciences Corporation |
Food and Beverage
In-kind items and services
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Edwards SAPIEN 3 Ultra Transcatheter Heart Valve | General | $19.08 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 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 โ by Provider and Service data, 2017โ2024; 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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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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255 | 93 | $278.67 | $129.29 |
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36415
Insertion of needle into vein for collection of blood sample
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165 | 79 | $22.00 | $8.60 |
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93793
Anticoagulant management of patient taking warfarin
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57 | 16 | $26.00 | $11.62 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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44 | 44 | $332.00 | $130.51 |
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90662
Influenza vaccine split virus, preservative free
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40 | 39 | $125.00 | $76.99 |
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G0008
Administration of influenza virus vaccine
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38 | 37 | $60.00 | $33.70 |
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99211
Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional
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28 | 13 | $67.00 | $23.62 |
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82962
Blood glucose (sugar) test performed by hand-held instrument
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23 | 16 | $22.00 | $3.21 |
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90480
Admn sarscov2 vacc 1 dose
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22 | 22 | $85.00 | $44.94 |
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91322
Sarscov2 vac 50 mcg/0.5ml im
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22 | 22 | $250.00 | $158.42 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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13 | 13 | $198.00 | $93.86 |
Source: CMS Part B by Provider and Service, 2024; 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 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 362 | 30,401 | $2,380.55 | 112 |
| Metoprolol Succinate | Metoprolol Succinate | 255 | 19,871 | $3,532.38 | 66 |
| Amlodipine Besylate | Amlodipine Besylate | 253 | 21,490 | $1,406.44 | 73 |
| Lisinopril | Lisinopril | 216 | 17,999 | $1,591.72 | 60 |
| Potassium Chloride | Potassium Chloride | 214 | 18,856 | $4,208.23 | 67 |
| Hydrochlorothiazide | Hydrochlorothiazide | 197 | 17,250 | $566.32 | 55 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 197 | 14,787 | $2,617.71 | 58 |
| Gabapentin | Gabapentin | 185 | 11,589 | $1,556.44 | 56 |
| Losartan Potassium | Losartan Potassium | 177 | 15,215 | $1,976.81 | 50 |
| Furosemide | Furosemide | 168 | 13,470 | $523.59 | 51 |
| Irbesartan | Irbesartan | 166 | 13,860 | $2,686.28 | 47 |
| Metformin Hcl | Metformin Hcl | 164 | 12,977 | $1,184.55 | 46 |
| Allopurinol | Allopurinol | 147 | 11,114 | $811.24 | 42 |
| Pantoprazole Sodium | Pantoprazole Sodium | 114 | 8,533 | $848.48 | 32 |
| Felodipine Er | Felodipine | 112 | 9,630 | $2,992.03 | 30 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 97 | 2,796 | $3,492.60 | 33 |
| Fluticasone Propionate | Fluticasone Propionate | 81 | 5,370 | $824.23 | 35 |
| Simvastatin | Simvastatin | 77 | 6,210 | $345.23 | 20 |
| Spironolactone | Spironolactone | 75 | 6,060 | $262.81 | 20 |
| Glipizide Er | Glipizide | 73 | 6,510 | $1,075.07 | 21 |
| Jardiance | Empagliflozin | 73 | 4,456 | $84,755.59 | 20 |
| Hydralazine Hcl | Hydralazine Hcl | 72 | 5,640 | $1,301.49 | 18 |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 72 | 6,120 | $2,515.41 | 22 |
| Carvedilol | Carvedilol | 70 | 5,520 | $479.85 | 24 |
| Trazodone Hcl | Trazodone Hcl | 69 | 3,570 | $179.94 | 17 |
(top 25 shown)
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: 2025-02-19NUCC 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
I20100109000273
IL
8921149170
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
Advocate Health And Hospitals Corporation
2320 E 93rd St, Chicago, IL 606173909
Phone: 7739673999
Advocate Health And Hospitals Corporation
100 W 162nd St, South Holland, IL 604732003
Phone: 7087302200
Advocate Health And Hospitals Corporation
9550 W 167th St, Orland Park, IL 604675561
Advocate Health And Hospitals Corporation
214 Mchenry Rd, Buffalo Grove, IL 600896748
Phone: 8474591160
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Family Medicine
Doctor of Medicine (M.D.)
Internal Medicine - Geriatric Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Dermatology
Doctor of Medicine (M.D.)
Family Medicine - Sports Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 29373 NETWORK PL, CHICAGO, IL 606731293
Recorded as LINUS EMA, DO
Registered at 2535 S KING DR, CHICAGO, IL 606164746 (Tel: 3128427117)
Registered at 2535 S MARTIN LUTHER KING DRIVE, CHICAGO, IL 60616 (Tel: 3128427117)
Internal Medicine (license number reported to NPPES: IL 036-087190)
NPI status registered as active in NPPES database
Registered at 2545 S KING DR, CHICAGO, IL 606162441 (Tel: 3128427117)
Registered at 2311 W 22ND ST, SUITE 202, OAK BROOK, IL 605231225
Recorded as LINUS EMA, D.O.
Internal Medicine
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Chicago
- Dr. Howard Bartman, MD
- Dr. Vivek Gupta, MD
- Dr. Khadidjatou Kane, MD
- Dr. Matthew Mandell, DO
- Dr. Mahrukh Siddiqui, MD
- Dr. Kevin Hunt, MD
Mailing Address
29373 Network Pl
Chicago, IL 606731293