Oscar Gerdner, MD
NPI 1801209952 · Child & Adolescent Psychiatry Physician · Darien, CT
Enrolled with Medicare as Order and Referring Only - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oscar Gerdner, MD is a Child & Adolescent Psychiatry Physician provider in Darien, CT (NPI 1801209952).
Provider details
- NPI number
- 1801209952
- Entity type
- Individual
- Primary specialty
- Child & Adolescent Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 60001 (CT)
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
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- Massachusetts General Hospital55 Fruit St.Boston, MA 02114Phone: (617) 724-5600
Registry dates
- Enumerated
- 2014-06-06
- Last updated
- 2023-05-31
- Certified
- 2023-05-31
Frequently asked questions
- What is Oscar Gerdner's NPI number?
- Oscar Gerdner's National Provider Identifier (NPI) is 1801209952, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oscar Gerdner's specialty?
- Oscar Gerdner is listed in the NPPES registry with a primary specialty of Child & Adolescent Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Oscar Gerdner located?
- Oscar Gerdner's practice location on file with NPPES is 30 Old Kings Hwy S, Darien, CT 06820-4551.
- What is Oscar Gerdner's phone number?
- The practice phone number listed in the NPPES registry for Oscar Gerdner is (203) 349-8037.
- Does Oscar Gerdner accept Medicare?
- Oscar Gerdner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oscar Gerdner's NPI active?
- Yes — Oscar Gerdner's NPI (1801209952) is active in the NPPES registry as of the last update on 2023-05-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.