GRANT CONNELL HALLOCK (DO) – Critical Care Medicine (Internal Medicine) Physician, NPI 1225666357
Critical Care Medicine (Internal Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
8,824 INTERNAL MEDICINE in IL
Provider Addresses for GRANT CONNELL HALLOCK (DO)
1646 RIVER ST UNIT 701
DES PLAINES, IL 600168418
Phone: (858) 414-0117
Type: Mailing
1775 DEMPSTER ST
PARK RIDGE, IL 600681143
Phone: (847) 723-2210
Fax: (847) 723-6987
Type: Location
2210 S GRACE ST APT 511
LOMBARD, IL 601485552
Phone: (858) 414-0117
Type: Mailing
333 BORTHWICK AVE
PORTSMOUTH, NH 038017128
Phone: (603) 559-4129
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $21.
Total Amount is formed as General ($21) + Research ($0) + Ownership ($0) = $21.
Last reported payment date: 2023-05-10 • Largest payer in this snapshot: GlaxoSmithKline, LLC. ($21).
Total Amount
$21
General + Research + Ownership
Payments
1
Total payment records
General Amount
$21
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-05-10
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GlaxoSmithKline, LLC. | $21 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2025-07-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20250723003878 | I | Internal Medicine | NH | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 60016)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | MA | |
| Physician Assistant | NH | |
| Pulmonary Disease, Internal Medicine, Critical Care (Intensivists), Internal Medicine | NH | |
| Nurse Practitioner | NH | |
| Nurse Practitioner | MA | |
| Nurse Practitioner | NH | |
| Nurse Practitioner | MA | |
| Pulmonary Disease | ME | |
| Nurse Practitioner | MA | |
| Critical Care (Intensivists) | MA |
Reviews
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