Dr. Gary Jack Davis , MD
Internal Medicine • Evanston, IL
1000 Central St, Suite 640
Evanston, IL 602011777
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 June 9, 2006; this date does not establish years in practice.
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Published CMS data list 309 Original Medicare Part B services in 2018.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018. Published rows only; this is not a quality measure.
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Published Part B service records, 2018:
- 93010 — Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only: 164 service units.
- 99213 — Established patient outpatient office visit: 78 service units.
- G0439 — Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit: 34 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2017 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2018). CPT notice
See all 5 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 1,654 Medicare Part D prescriptions, including refills, in 2018.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2018. Published rows only; this is not a quality measure.
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Published Part D records, 2018:
- Atorvastatin Calcium — 167 prescription fills, including refills.
- Levothyroxine Sodium — 101 prescription fills, including refills.
- Simvastatin — 94 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2018. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 50 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 2,635 in 2017 to 309 in 2018.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017–2018.
Practice Location & Contact Primary Location
1000 Central St
Suite 640
Evanston, IL 602011777
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $13,687 in 2018
The total amount Medicare approved for these services in 2018. 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 – by Provider and Service, 2018.
Paid by Medicare
About $9,953 in 2018
The part of the Medicare-allowed amount that Medicare itself paid in 2018, 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 – by Provider and Service, 2018.
30-day fills
4,029 standardized 30-day fills in 2018
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
$66,007 in 2018
The total cost of these prescriptions in 2018, 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 – by Provider and Drug, 2018.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $11.98 in 2020
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 2020.
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, “Does your provider accept Medicare as full payment?”
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.
Compared with the same specialty in Evanston and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Davis are from 2018.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Davis are from 2018.
178 active clinicians are listed under Internal Medicine with a practice address in Evanston, IL (7,245 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Evanston
14.6% of these 178 clinicians have the CMS telehealth indicator.
34.3% of these 178 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 88% from 2,635 in 2017 to 309 in 2018.
- 2017: 2,635
- 2018: 309
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Medicare-allowed amount
Medicare-allowed amount decreased 83% from $82,259 in 2017 to $13,687 in 2018.
- 2017: $82,259
- 2018: $13,687
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Paid by Medicare
Paid by Medicare decreased 85% from $66,053 in 2017 to $9,953 in 2018.
- 2017: $66,053
- 2018: $9,953
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 44% from 2,929 in 2014 to 1,654 in 2018.
- 2014: 2,929
- 2015: 3,606
- 2016: 4,152
- 2017: 4,194
- 2018: 1,654
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30-day fills
30-day fills decreased 38% from 6,527 in 2014 to 4,029 in 2018.
- 2014: 6,527
- 2015: 7,827
- 2016: 8,905
- 2017: 9,166
- 2018: 4,029
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Part D drug cost
Part D drug cost decreased 57% from $154,911 in 2014 to $66,007 in 2018.
- 2014: $154,911
- 2015: $173,418
- 2016: $189,126
- 2017: $179,421
- 2018: $66,007
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $122.53 in 2019 to $11.98 in 2020.
- 2019: $122.53
- 2020: $11.98
Sources: CMS Medicare Physician & Other Practitioners (2018), CMS Medicare Part D Prescribers (2018), CMS Open Payments (2020), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 2020 (payments made January 1 – December 31, 2020): fewer than 11 records totaling $11.98.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| CHIESI USA, INC. |
Education
Cash or cash equivalent
|
KENGREAL | General | $11.98 |
Source: CMS Open Payments, program year 2020, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2017 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 – by Provider and Service data, 2017–2018; 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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93010
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
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164 | 119 | $32.00 | $8.93 |
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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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78 | 71 | $60.82 | $54.25 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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34 | 34 | $252.00 | $122.51 |
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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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22 | 21 | $123.00 | $83.64 |
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G0438
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit
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11 | 11 | $381.00 | $180.46 |
Source: CMS Part B by Provider and Service, 2018; 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 2018.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 167 | 13,708 | $3,245.26 | 78 |
| Levothyroxine Sodium | Levothyroxine Sodium | 101 | 8,343 | $3,026.94 | 43 |
| Simvastatin | Simvastatin | 94 | 6,978 | $1,161.86 | 38 |
| Amlodipine Besylate | Amlodipine Besylate | 85 | 6,138 | $864.11 | 32 |
| Metoprolol Succinate | Metoprolol Succinate | 84 | 6,810 | $3,226.66 | 38 |
| Lisinopril | Lisinopril | 66 | 5,398 | $552.46 | 33 |
| Losartan Potassium | Losartan Potassium | 66 | 5,652 | $643.60 | 25 |
| Omeprazole | Omeprazole | 59 | 4,228 | $1,020.59 | 22 |
| Warfarin Sodium | Warfarin Sodium | 57 | 3,789 | $1,056.20 | 25 |
| Triamterene-Hydrochlorothiazid | Triamterene/Hydrochlorothiazid | 55 | 4,410 | $922.00 | 23 |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 51 | 4,125 | $608.04 | 23 |
| Metoprolol Tartrate | Metoprolol Tartrate | 47 | 3,150 | $405.91 | 20 |
| Tamsulosin Hcl | Tamsulosin Hcl | 39 | 2,235 | $845.11 | 15 |
| Metformin Hcl | Metformin Hcl | 38 | 3,375 | $468.70 | 19 |
| Pantoprazole Sodium | Pantoprazole Sodium | 36 | 1,987 | $343.55 | 11 |
| Atenolol | Atenolol | 32 | 2,880 | $367.49 | 12 |
| Furosemide | Furosemide | 31 | 2,550 | $276.60 | 18 |
| Allopurinol | Allopurinol | 29 | 2,488 | $649.94 | 16 |
| Alprazolam | Alprazolam | 29 | 855 | $350.25 | 16 |
| Clopidogrel | Clopidogrel Bisulfate | 24 | 2,160 | $646.08 | 12 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 23 | 429 | $671.41 | 17 |
| Gabapentin | Gabapentin | 21 | 1,440 | $313.48 | — |
| Xarelto | Rivaroxaban | 19 | 855 | $11,947.91 | — |
| Hydrochlorothiazide | Hydrochlorothiazide | 19 | 1,710 | $134.19 | — |
| Spiriva | Tiotropium Bromide | 19 | 750 | $10,102.75 | — |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2018; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC 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.
NUCC Taxonomy Code: 207RC0000X
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
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.)
Nurse Practitioner
APNCNP
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated June 09, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Evanston
- Dr. Yvette Shannon, DO
- Dr. Binh Nguyen, MD
- Dr. Kenneth Grumet, MD
- Dr. Emily Andrew, MD
- Dr. Tequilla Stanciel, MD
- Dr. John Ebihara, MD
Mailing Address
2650 Ridge Ave, Evanston Hospital
Evanston, IL 602011718
Phone: 8475701206