Gregory Robert Cook , APRN, CNP
Nurse Practitioner โข Chicago, IL
676 N Saint Clair St Ste 2100
Chicago, IL 606112993
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 16, 2019; this date does not establish years in practice.
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Published CMS data list 465 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: 336 service units.
- 99204 โ New patient outpatient office visit: 77 service units.
- 99443 โ Telephone medical discussion with physician: 52 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 the full table ยท Guide: How to read Medicare Part B data
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Published CMS data list 619 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:
- Trelegy Ellipta (Fluticasone/Umeclidin/Vilanter) โ 119 prescription fills, including refills.
- Albuterol Sulfate Hfa (Albuterol Sulfate) โ 115 prescription fills, including refills.
- Prednisone โ 62 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 15 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 85% of clinicians listed under Nurse Practitioner in Chicago, IL (2024, 377 clinicians with data). Median for this group: 153. Middle half: 60 to 327.
More Medicare Part B services than 70% of clinicians listed under Nurse Practitioner in Illinois (2024, 2,561 clinicians with data). Median for this group: 261. Middle half: 101 to 526.
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 209 in 2020 to 465 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
676 N Saint Clair St Ste 2100
Chicago, IL 606112993
CMS Doctors and Clinicians lists 1 group name: Northwestern Medical Faculty Foundation. 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
2019
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
373 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 $54,303 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 $39,721 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
807 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
$185,088 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: $244.19 across 10 records.
By nature of payment
- Food and Beverage: $244.19 across 10 records.
Reporting-company totals
- Insmed, Inc.: $100.53 across 4 records.
- GlaxoSmithKline, LLC.: $80.66 across 3 records.
- AstraZeneca Pharmaceuticals LP: $63.00 across 3 records.
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
7 years (graduated 2019)
CMS Doctors and Clinicians data list 2019 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
2019
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)
Gregory Cook 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 Gregory Cook 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 85% of clinicians listed under Nurse Practitioner in Chicago, IL (2024, 377 clinicians with data). Median for this group: 153. Middle half: 60 to 327.
More Medicare Part B services than 70% of clinicians listed under Nurse Practitioner in Illinois (2024, 2,561 clinicians with data). Median for this group: 261. Middle half: 101 to 526.
Medicare-allowed amount
A higher Medicare-allowed amount than 85% of clinicians listed under Nurse Practitioner in Chicago, IL (2024, 377 clinicians with data). Median for this group: $13,286. Middle half: $5,333 to $28,905.
A higher Medicare-allowed amount than 80% of clinicians listed under Nurse Practitioner in Illinois (2024, 2,561 clinicians with data). Median for this group: $21,010. Middle half: $8,652 to $42,014.
Paid by Medicare
A higher Medicare payment amount than 85% of clinicians listed under Nurse Practitioner in Chicago, IL (2024, 377 clinicians with data). Median for this group: $9,934. Middle half: $3,962 to $21,570.
A higher Medicare payment amount than 80% of clinicians listed under Nurse Practitioner in Illinois (2024, 2,561 clinicians with data). Median for this group: $15,151. Middle half: $6,396 to $31,322.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Nurse Practitioner in Chicago, IL (2024, 364 clinicians with data). Median for this group: 134. Middle half: 47 to 424.
More Part D prescriptions than 65% of clinicians listed under Nurse Practitioner in Illinois (2024, 2,572 clinicians with data). Median for this group: 259. Middle half: 80 to 930.
Part D drug cost
A higher Part D drug cost than 85% of clinicians listed under Nurse Practitioner in Chicago, IL (2024, 364 clinicians with data). Median for this group: $7,605. Middle half: $492 to $57,977.
A higher Part D drug cost than 80% of clinicians listed under Nurse Practitioner in Illinois (2024, 2,572 clinicians with data). Median for this group: $10,867. Middle half: $976 to $113,945.
952 active clinicians are listed under Nurse Practitioner with a practice address in Chicago, IL (4,894 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
20% of these 952 clinicians have the CMS telehealth indicator.
56.2% of these 952 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 increased 122% from 209 in 2020 to 465 in 2024.
- 2020: 209
- 2021: 690
- 2022: 798
- 2023: 451
- 2024: 465
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Medicare-allowed amount
Medicare-allowed amount increased 242% from $15,892 in 2020 to $54,303 in 2024.
- 2020: $15,892
- 2021: $65,386
- 2022: $77,315
- 2023: $42,119
- 2024: $54,303
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Paid by Medicare
Paid by Medicare increased 212% from $12,742 in 2020 to $39,721 in 2024.
- 2020: $12,742
- 2021: $48,755
- 2022: $55,826
- 2023: $29,055
- 2024: $39,721
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Medicare Part D prescriptions
Medicare Part D prescriptions went from 11 in 2020 to 619 in 2024.
- 2020: 11
- 2021: 666
- 2022: 1,258
- 2023: 1,354
- 2024: 619
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30-day fills
30-day fills went from 19 in 2020 to 807 in 2024.
- 2020: 19
- 2021: 852
- 2022: 1,663
- 2023: 1,755
- 2024: 807
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Part D drug cost
Part D drug cost went from $300 in 2020 to $185,088 in 2024.
- 2020: $300
- 2021: $204,960
- 2022: $442,992
- 2023: $515,240
- 2024: $185,088
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $564.96 in 2021 to $244.19 in 2025.
- 2021: $564.96
- 2022: $403.63
- 2023: $289.74
- 2024: $263.22
- 2025: $244.19
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 $244.19.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
|
โ | General | $43.25 |
| Insmed, Inc. |
Food and Beverage
In-kind items and services
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Arikayce | General | $27.60 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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FASENRA | General | $27.03 |
| Insmed, Inc. |
Food and Beverage
In-kind items and services
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Arikayce | General | $26.34 |
| Insmed, Inc. |
Food and Beverage
In-kind items and services
|
Arikayce | General | $23.64 |
| Insmed, Inc. |
Food and Beverage
In-kind items and services
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Arikayce | General | $22.95 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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NUCALA | General | $19.90 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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FASENRA | General | $19.82 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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NUCALA | General | $17.51 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
FASENRA | General | $16.15 |
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 2019โ2023 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, 2020โ2024; 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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336 | 280 | $322.43 | $111.47 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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77 | 77 | $505.00 | $142.92 |
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99443
Telephone medical discussion with physician, 21-30 minutes
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52 | 45 | $250.00 | $112.39 |
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 |
|---|---|---|---|---|---|
| Trelegy Ellipta | Fluticasone/Umeclidin/Vilanter | 119 | 4,830 | $100,549.00 | 31 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 115 | 3,386 | $4,409.58 | 50 |
| Prednisone | Prednisone | 62 | 541 | $235.62 | 43 |
| Azithromycin | Azithromycin | 60 | 982 | $482.83 | 35 |
| Anoro Ellipta | Umeclidinium Brm/Vilanterol Tr | 54 | 2,670 | $40,537.45 | 15 |
| Breo Ellipta | Fluticasone/Vilanterol | 36 | 1,440 | $18,374.10 | 13 |
| Fluticasone Propionate | Fluticasone Propionate | 34 | 2,040 | $401.45 | 22 |
| Budesonide-Formoterol Fumarate | Budesonide/Formoterol Fumarate | 31 | 1,110 | $5,857.91 | โ |
| Symbicort | Budesonide/Formoterol Fumarate | 24 | 960 | $7,323.07 | 12 |
| Ventolin Hfa | Albuterol Sulfate | 19 | 495 | $1,246.39 | 12 |
| Azelastine Hcl | Azelastine Hcl | 16 | 799 | $270.37 | โ |
| Doxycycline Hyclate | Doxycycline Hyclate | 14 | 140 | $98.05 | 13 |
| Incruse Ellipta | Umeclidinium Bromide | 12 | 360 | $4,053.77 | โ |
| Wixela Inhub | Fluticasone Propion/Salmeterol | 12 | 480 | $1,188.81 | โ |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 11 | 83 | $59.99 | 11 |
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: 2023-09-19NUCC Taxonomy Code: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
NUCC Taxonomy Code: 363LF0000X
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20230918004215
IL
4688093826
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
Northwestern Medical Faculty Foundation
675 N St Clair, Chicago, IL 606115975
Northwestern Medical Faculty Foundation
676 N Saint Clair St, Chicago, IL 606112927
Northwestern Medical Faculty Foundation
675 N Saint Clair St, Chicago, IL 606115975
Northwestern Medical Faculty Foundation
676 N Saint Clair, Chicago, IL 606112927
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Physician Assistant
Physician Assistant
Internal Medicine - Pulmonary Disease
Doctor of Medicine (M.D.)
Internal Medicine - Pulmonary Disease
Doctor of Medicine (M.D.)
Internal Medicine - Pulmonary Disease
Doctor of Medicine (M.D.)
Nurse Practitioner
Internal Medicine - Pulmonary Disease
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 676 N SAINT CLAIR ST STE 2100, CHICAGO, IL 606112993 (Tel: 3126951800)
Registered at 676 N SAINT CLAIR ST STE 2100, CHICAGO, IL 606112993 (Tel: 3126951800)
Recorded as GREGORY COOK, APRN, CNP
Nurse Practitioner (license number reported to NPPES: IL 209027656)
Registered at 4205 BELFORT RD STE 4015, JACKSONVILLE, FL 322163623 (Tel: 9044506017)
NPI status registered as active in NPPES database
Registered at 1536 N JEFFERSON ST, JACKSONVILLE, FL 322096525 (Tel: 9044755800)
Registered at 6424 FORDHAM CIR E, JACKSONVILLE, FL 322172457 (Tel: 9046228338)
Recorded as GREGORY COOK
Nurse Practitioner (license number reported to NPPES: FL 11003002)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Chicago
- Dr. Carolyn Keffer, DNP, FNP-BC
- Kristy Kiermaier, FNP-BC
- Sarah Dobbins
- Crista Brokamp, APRN, CNP
- Christa Mustapha, NP
- Zachary Speicher, APRN, CNP
More public profiles in Illinois
Directory navigation, in NPI number order.
- Paritosh Prasai, MD Internal Medicine ยท Evanston
- Trisha Homan, AGACNP-BC Nurse Practitioner - Acute Care ยท Chicago
- Mary Maloney, ANP Nurse Practitioner ยท Belleville
- Eyad Abdulrazzak, MD Hospitalist ยท Evanston
- Andrea Leezer, LCSW Social Worker - Clinical ยท Quincy
- Shaniqua Miles, LCSW Social Worker - Clinical ยท Bloomington
- Timothy Mcginnis, DPT Physical Therapist ยท Evergreen Park
- Adepeju Ojomalade Nurse Practitioner - Family ยท Chicago
- Bridget Mackey, DPT, PT Physical Therapist ยท Park Ridge
- Zachary Matushek Pharmacist ยท Lake In The Hills
- Margaret Pritchard, DPT Physical Therapist ยท Champaign
- Anna Dicicco, DNP, AGNP-BC Nurse Practitioner ยท Dekalb
Mailing Address
676 N Saint Clair St Ste 2100
Chicago, IL 606112993
Phone: 3126951800