Benjamin Mcmahon, MD
NPI 1639865421 · Psychiatry Physician · Washington, DC
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Benjamin Mcmahon, MD is a Psychiatry Physician provider in Washington, DC (NPI 1639865421).
Provider details
- NPI number
- 1639865421
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD600001876 (DC)
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
3 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
- 2023-04-13
- Last updated
- 2024-10-17
- Certified
- 2024-10-02
Frequently asked questions
- What is Benjamin Mcmahon's NPI number?
- Benjamin Mcmahon's National Provider Identifier (NPI) is 1639865421, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Benjamin Mcmahon's specialty?
- Benjamin Mcmahon is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Benjamin Mcmahon located?
- Benjamin Mcmahon's practice location on file with NPPES is 2150 Pennsylvania Ave Nw, Washington, DC 20037-3201.
- What is Benjamin Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Benjamin Mcmahon is (202) 741-3000.
- Does Benjamin Mcmahon accept Medicare?
- Benjamin Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Benjamin Mcmahon's NPI active?
- Yes — Benjamin Mcmahon's NPI (1639865421) is active in the NPPES registry as of the last update on 2024-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.