GREGORY B. COOK DC
NPI 1689628562
Chiropractor in Lake In The Hills, IL
About Gregory B. Cook Dc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREGORY B. COOK DC (NPI 1689628562) is an individual chiropractor in Lake In The Hills, Illinois, licensed in Illinois (038008183) and active in the NPI registry since May 2006. He is a graduate of Palmer College Chiropractic - Davenport (1997).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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 B. Cook Dc 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.
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.
West Branch, MI 48661
- Reassigned Medicare billing, Michigan enrollment
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
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.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 1689628562. It was assigned to this individual provider in the NPPES registry on May 22, 2006.
Where is Gregory Cook located?
Gregory Cook practices at 61 Polaris Dr Suite 2, Lake In The Hills, IL 60156. The listed phone number is (815) 356-6200.
What is Gregory Cook's specialty?
The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.
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 Cook Chiropractic (West Branch, MI). 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.
What insurance does Gregory Cook accept?
Health plans from Blue Cross Blue Shield of Michigan Mutual Insurance Company and Priority Health list Gregory Cook as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Gregory Cook was last updated on October 14, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Gregory B. Cook, DC · NPI 1689628562
Chiropractor provider in Lake In The Hills, Illinois. Individual provider, active in the CMS NPPES registry since May 22, 2006.
## Identity
- **NPI:** 1689628562 (Entity type: Individual)
- **Enumerated:** May 22, 2006
- **Primary specialty:** Chiropractor · taxonomy 111N00000X
- **State license:** 038008183 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 61 POLARIS DR, SUITE 2, Lake In The Hills, IL 60156-5606
- **Phone:** (815) 356-6200 · **Fax:** (224) 509-8068
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** Cook Chiropractic (NPI 1982399895, West Branch, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Palmer College Chiropractic - Davenport, class of 1997
## Record status
- **NPPES last updated:** October 14, 2016
---
Source: [NPI Profile](https://npiprofile.com/npi/1689628562) · Data from the CMS NPPES public registry.