GRANT CONNELL HALLOCK DO
NPI 1225666357
Internal Medicine - Critical Care Medicine in Park Ridge, IL
About Grant Connell Hallock Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GRANT CONNELL HALLOCK DO (NPI 1225666357) is an individual critical care medicine provider in Park Ridge, Illinois, licensed in Illinois (036.166239) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, is affiliated with St Joseph Hospital, and is a graduate of Other (2020).
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
Grant Connell Hallock Do 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 Reassignments
2Medicare enrollment records show Grant Hallock reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
North Andover, MA 01845
- Reassigned Medicare billing, New Hampshire enrollment
- 41 clinicians in this Medicare group
North Andover, MA 01845
- Reassigned Medicare billing, New Hampshire enrollment
- 41 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Joseph Hospital
Acute Care Hospitals · Nashua, NHPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60068 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
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 Grant Hallock's NPI number?
The NPI number for Grant Hallock is 1225666357. It was assigned to this individual provider in the NPPES registry on April 1, 2020.
Where is Grant Hallock located?
Grant Hallock practices at 1775 Dempster St, Park Ridge, IL 60068. The listed phone number is (847) 723-2210.
What is Grant Hallock's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Grant Hallock enrolled in Medicare?
Yes. Grant Hallock 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 organizations bill Medicare for Grant Hallock's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Grant Hallock reassigns Medicare benefits to 2 organizations: Incare LLC (North Andover, MA) and Incare Tufts PLLC (North Andover, MA). Each 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 Grant Hallock's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Grant Hallock accept?
Health plans from Ambetter from NH Healthy Families and WellSense Health Plan list Grant Hallock 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.
Is Grant Hallock affiliated with any hospitals?
According to CMS data, Grant Hallock is affiliated with St Joseph Hospital.
When was this NPI record last updated?
The NPPES record for Grant Hallock was last updated on March 28, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Grant Connell Hallock, DO · NPI 1225666357
Critical Care Medicine physician in Park Ridge, Illinois. Individual provider, active in the CMS NPPES registry since April 1, 2020.
## Identity
- **NPI:** 1225666357 (Entity type: Individual)
- **Enumerated:** April 1, 2020
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 036.166239 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 1775 DEMPSTER ST, Park Ridge, IL 60068-1143
- **Phone:** (847) 723-2210 · **Fax:** (847) 723-6987
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Incare LLC (NPI 1639655467, North Andover, MA); Incare Tufts PLLC (NPI 1164305611, North Andover, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** March 28, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1225666357) · Data from the CMS NPPES public registry.