Robert Williamson, M.D.
NPI 1316950298 · Psychiatry Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Williamson, M.D. is a Psychiatry Physician provider in Phoenix, AZ (NPI 1316950298).
Provider details
- NPI number
- 1316950298
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- K5430 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
- 2006-08-14
- Last updated
- 2011-06-08
Frequently asked questions
- What is Robert Williamson's NPI number?
- Robert Williamson's National Provider Identifier (NPI) is 1316950298, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Williamson's specialty?
- Robert Williamson is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Williamson located?
- Robert Williamson's practice location on file with NPPES is 903 N 2nd St, Phoenix, AZ 85004-1906.
- What is Robert Williamson's phone number?
- The practice phone number listed in the NPPES registry for Robert Williamson is (602) 416-7600.
- Does Robert Williamson accept Medicare?
- Robert Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Williamson's NPI active?
- Yes — Robert Williamson's NPI (1316950298) is active in the NPPES registry as of the last update on 2011-06-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.