Grant Whitmer, MD
NPI 1225511678 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grant Whitmer, MD is a Internal Medicine Physician provider in Chicago, IL (NPI 1225511678).
Provider details
- NPI number
- 1225511678
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
7 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$22 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-09-12
- Last updated
- 2025-01-30
- Certified
- 2025-01-30
Frequently asked questions
- What is Grant Whitmer's NPI number?
- Grant Whitmer's National Provider Identifier (NPI) is 1225511678, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Whitmer's specialty?
- Grant Whitmer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Grant Whitmer located?
- Grant Whitmer's practice location on file with NPPES is 251 E Huron St, Chicago, IL 60611-2908.
- What is Grant Whitmer's phone number?
- The practice phone number listed in the NPPES registry for Grant Whitmer is (312) 503-7975.
- Does Grant Whitmer accept Medicare?
- Grant Whitmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grant Whitmer's NPI active?
- Yes — Grant Whitmer's NPI (1225511678) is active in the NPPES registry as of the last update on 2025-01-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.