Gregory Weissler, MD
NPI 1861029514 · Pediatrics Physician · Fenton, MO
Enrolled with Medicare as Order and Referring Only - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Weissler, MD is a Pediatrics Physician provider in Fenton, MO (NPI 1861029514).
Provider details
- NPI number
- 1861029514
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2023013879 (MO)
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
- 2020-03-24
- Last updated
- 2023-09-25
- Certified
- 2023-07-06
Frequently asked questions
- What is Gregory Weissler's NPI number?
- Gregory Weissler's National Provider Identifier (NPI) is 1861029514, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Weissler's specialty?
- Gregory Weissler is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Weissler located?
- Gregory Weissler's practice location on file with NPPES is 1345 Smizer Mill Rd Ste 1200, Fenton, MO 63026-7305.
- What is Gregory Weissler's phone number?
- The practice phone number listed in the NPPES registry for Gregory Weissler is (636) 496-5021.
- Does Gregory Weissler accept Medicare?
- Gregory Weissler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Weissler's NPI active?
- Yes — Gregory Weissler's NPI (1861029514) is active in the NPPES registry as of the last update on 2023-09-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.