Grant Hallock, DO
NPI 1225666357 · Critical Care Medicine (Internal Medicine) Physician · Park Ridge, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grant Hallock, DO is a Critical Care Medicine (Internal Medicine) Physician provider in Park Ridge, IL (NPI 1225666357).
Provider details
- NPI number
- 1225666357
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 036.166239 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-04-01
- Last updated
- 2024-03-28
- Certified
- 2023-04-11
Frequently asked questions
- What is Grant Hallock's NPI number?
- Grant Hallock's National Provider Identifier (NPI) is 1225666357, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Hallock's specialty?
- Grant Hallock is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Grant Hallock located?
- Grant Hallock's practice location on file with NPPES is 1775 Dempster St, Park Ridge, IL 60068-1143.
- What is Grant Hallock's phone number?
- The practice phone number listed in the NPPES registry for Grant Hallock is (847) 723-2210.
- Does Grant Hallock accept Medicare?
- Grant Hallock is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grant Hallock's NPI active?
- Yes — Grant Hallock's NPI (1225666357) is active in the NPPES registry as of the last update on 2024-03-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.