GREGORY ROBERT COOK JR. APRN, CNP
NPI 1053964395
Nurse Practitioner in Chicago, IL

Q: What is Gregory Cook's NPI number?

The NPI number for Gregory Cook is 1053964395. It was assigned to this individual provider in the NPPES registry on July 16, 2019.

Q: What is Gregory Cook's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Cook was last updated on September 19, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 16, 2019PECOS EnrolledAccepts Medicare Assignment

676 N SAINT CLAIR ST STE 2100, CHICAGO, IL 60611(312) 695-1800(312) 695-4741 Get Directions Write a Review

NPPES record last updated: September 19, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 26, 2020, Jul 16, 2019 (2 updates tracked since 2019).

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About Gregory Robert Cook Jr. Aprn, Cnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GREGORY ROBERT COOK JR. APRN, CNP (NPI 1053964395) is an individual nurse practitioner in Chicago, Illinois, licensed in Illinois (209027656) and active in the NPI registry since July 2019. He is enrolled in Medicare PECOS, is affiliated with Palos Community Hospital, and is a graduate of Other (2019).

NPPES Registry Identity

NPI1053964395

Entity TypeIndividualMale

Primary Taxonomy363L00000X

Provider Legal NameGREGORY ROBERT COOK JR.Credential: APRN, CNP

Location Address676 N SAINT CLAIR ST STE 2100Chicago, IL 60611-2993

Mailing Address676 N Saint Clair St Ste 2100Chicago, IL 60611-2993 · (312) 695-1800 · Fax (312) 695-4741

Phone(312) 695-1800

Fax(312) 695-4741

Sole ProprietorNo

Medical School CMSOtherGraduated 2019

Enumeration DateJuly 16, 2019

Last NPPES UpdateSeptember 19, 20232 updates tracked since enumeration

NPPES CertifiedSeptember 19, 2023

✔ NPI 1053964395 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363L00000X

License✔ Licensed in IL · 209027656

Definition

(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.

Also ListedNurse Practitioner · FamilyTaxonomy 363LF0000X · License 11003002 (FL)

676 N SAINT CLAIR ST STE 2100, Chicago, IL 60611

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gregory Robert Cook Jr. Aprn, Cnp is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4688093826

PECOS Enrollment IDI20230918004215

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Gregory Cook reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northwestern Medical Faculty Foundation

35 mi

Multi-Specialty

DEPT 5777
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
4,817 clinicians in this Medicare group

NPI 1346235314 (855) 694-2866

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

336 services280 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

77 services77 patients

Telephone medical discussion with physician, 21-30 minutes 99443

This service involves a 21-30 minute phone conversation with a physician. It's a chance for you to discuss your health concerns, symptoms or treatment plans. It's similar to an in-person consultation, but conducted over the phone for your convenience and safety.

52 services45 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Palos Community Hospital

Acute Care Hospitals · Palos Heights, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140062

Location12251 South 80th AvenuePalos Heights, IL 60463 · Cook County

Emergency services Birthing friendly

Northwestern Lake Forest Hospital

Acute Care Hospitals · Lake Forest, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number140130

Location1000 N Westmoreland RoadLake Forest, IL 60045 · Lake County

Emergency services Birthing friendly

Northwestern Memorial Hospital

Acute Care Hospitals · Chicago, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140281

Location251 E Huron StChicago, IL 60611 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60611 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$94.06 typical visit price

range $60.08 – $183.39

Typical copayment $23.51 (range $15.02 – $45.84)

Most-billed visit code 99203

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 25

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Tubing with integrated heating element for use with positive airway pressure device A4604

DME-Other DME · category DE001N

12 suppliers244 claims244 services$33.01 avg. paid by Medicare

Full face mask used with positive airway pressure device, each A7030

DME-Other DME · category DE001N

11 suppliers158 claims158 services$71.17 avg. paid by Medicare

Face mask interface, replacement for full face mask, each A7031

DME-Other DME · category DE001N

8 suppliers161 claims440 services$27.61 avg. paid by Medicare

Cushion for use on nasal mask interface, replacement only, each A7032

DME-Other DME · category DE001N

9 suppliers111 claims630 services$16.24 avg. paid by Medicare

Pillow for use on nasal cannula type interface, replacement only, pair A7033

DME-Other DME · category DE001N

8 suppliers86 claims508 services$12.72 avg. paid by Medicare

Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap A7034

DME-Other DME · category DE001N

11 suppliers208 claims208 services$45.02 avg. paid by Medicare

Headgear used with positive airway pressure device A7035

DME-Other DME · category DE001N

12 suppliers185 claims185 services$14.84 avg. paid by Medicare

Chinstrap used with positive airway pressure device A7036

DME-Other DME · category DE001N

6 suppliers12 claims12 services$8.89 avg. paid by Medicare

Tubing used with positive airway pressure device A7037

DME-Other DME · category DE001N

10 suppliers132 claims132 services$9.29 avg. paid by Medicare

Filter, disposable, used with positive airway pressure device A7038

DME-Other DME · category DE001N

14 suppliers339 claims1,996 services$1.58 avg. paid by Medicare

Filter, non disposable, used with positive airway pressure device A7039

DME-Other DME · category DE001N

6 suppliers43 claims43 services$5.11 avg. paid by Medicare

Water chamber for humidifier, used with positive airway pressure device, replacement, each A7046

DME-Other DME · category DE001N

12 suppliers153 claims153 services$10.17 avg. paid by Medicare

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

5 suppliers72 claims73 services$14.23 avg. paid by Medicare

Home ventilator, any type, used with non-invasive interface, (e.g., mask, chest shell) E0466

DME-Other DME · category DE005N

1 supplier12 claims12 services$920.71 avg. paid by Medicare

Respiratory assist device, bi-level pressure capability, without backup rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device) E0470

DME-Other DME · category DE001N

5 suppliers74 claims74 services$72.34 avg. paid by Medicare

Respiratory assist device, bi-level pressure capability, with back-up rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device) E0471

DME-Other DME · category DE001N

2 suppliers16 claims16 services$229.02 avg. paid by Medicare

Humidifier, heated, used with positive airway pressure device E0562

DME-Other DME · category DE001N

5 suppliers25 claims25 services$118.84 avg. paid by Medicare

Humidifier, heated, used with positive airway pressure device E0562

DME-Other DME · category DE001N

3 suppliers26 claims29 services$9.74 avg. paid by Medicare

Nebulizer, with compressor E0570

DME-Other DME · category DE000N

5 suppliers85 claims85 services$3.19 avg. paid by Medicare

Continuous positive airway pressure (cpap) device E0601

DME-Other DME · category DE001N

8 suppliers267 claims271 services$26.83 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

9 suppliers390 claims390 services$68.35 avg. paid by Medicare

Portable oxygen concentrator, rental E1392

DME-Oxygen and Supplies · category DC002N

5 suppliers217 claims217 services$29.85 avg. paid by Medicare

Albuterol, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose, 1 mg J7613

DME-Drugs Administered Through DME · category DG006N

10 suppliers20 claims3,383 services$0.03 avg. paid by Medicare

Albuterol, up to 2.5 mg and ipratropium bromide, up to 0.5 mg, fda-approved final product, non-compounded, administered through dme J7620

DME-Drugs Administered Through DME · category DG006N

7 suppliers15 claims1,440 services$0.10 avg. paid by Medicare

Pharmacy dispensing fee for inhalation drug(s); per 30 days Q0513

DME-Other DME · category DE000N

12 suppliers24 claims24 services$26.00 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 14

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KIERSTEN JUDITH O'NEILL PA-C

Physician Assistant

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

WILLIAM CHRISTIAN AHRENHOLZ PA

Physician Assistant

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

DR. MAANASI SAMANT MD

Internal Medicine (Pulmonary Disease)

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

BO HENRY MARSHALL PA-C

Physician Assistant

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

DR. JAMES M WALTER MD

Internal Medicine (Pulmonary Disease)

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

FAITH LLOYD APRN, CNP

Nurse Practitioner

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

ALISON L SZABO MD

Internal Medicine (Pulmonary Disease)

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

MELISSA HUML APRN, CNP

Nurse Practitioner

676 N SAINT CLAIR ST STE 2100
CHICAGO, IL 60611

Cook County (312) 695-1800

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Cook's NPI number?

The NPI number for Gregory Cook is 1053964395. It was assigned to this individual provider in the NPPES registry on July 16, 2019.

Where is Gregory Cook located?

Gregory Cook practices at 676 N Saint Clair St Ste 2100, Chicago, IL 60611. The listed phone number is (312) 695-1800.

What is Gregory Cook's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Gregory Cook enrolled in Medicare?

Yes. Gregory Cook is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Gregory Cook's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Cook reassigns Medicare benefits to Northwestern Medical Faculty Foundation (Carol Stream, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Cook's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Gregory Cook affiliated with any hospitals?

According to CMS data, Gregory Cook is affiliated with Palos Community Hospital, Northwestern Lake Forest Hospital and Northwestern Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Cook was last updated on September 19, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.