Gregory Kastner, MD
NPI 1659361525 · Internal Medicine Physician · Robinson, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Kastner, MD is a Internal Medicine Physician provider in Robinson, IL (NPI 1659361525).
Provider details
- NPI number
- 1659361525
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036068467 (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
20 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
- 2005-10-24
- Last updated
- 2020-09-09
- Certified
- 2020-09-09
Frequently asked questions
- What is Gregory Kastner's NPI number?
- Gregory Kastner's National Provider Identifier (NPI) is 1659361525, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Kastner's specialty?
- Gregory Kastner is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Kastner located?
- Gregory Kastner's practice location on file with NPPES is 1101 N Allen St Ste 200, Robinson, IL 62454-1168.
- What is Gregory Kastner's phone number?
- The practice phone number listed in the NPPES registry for Gregory Kastner is (618) 546-5464.
- Does Gregory Kastner accept Medicare?
- Gregory Kastner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Kastner's NPI active?
- Yes — Gregory Kastner's NPI (1659361525) is active in the NPPES registry as of the last update on 2020-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.