William Hartmann, MD
NPI 1255318408 · Psychiatry Physician · Mason, OH
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Hartmann, MD is a Psychiatry Physician provider in Mason, OH (NPI 1255318408).
Provider details
- NPI number
- 1255318408
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35-079023 (OH)
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
- 2005-12-29
- Last updated
- 2015-09-04
Frequently asked questions
- What is William Hartmann's NPI number?
- William Hartmann's National Provider Identifier (NPI) is 1255318408, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Hartmann's specialty?
- William Hartmann is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is William Hartmann located?
- William Hartmann's practice location on file with NPPES is 4075 Old Western Row Rd, Mason, OH 45040-3104.
- What is William Hartmann's phone number?
- The practice phone number listed in the NPPES registry for William Hartmann is (513) 536-0600.
- Does William Hartmann accept Medicare?
- William Hartmann is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Hartmann's NPI active?
- Yes — William Hartmann's NPI (1255318408) is active in the NPPES registry as of the last update on 2015-09-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.