IndividualActive
William Marsh
NPI 1447756234 · Psychologist · Phoenix, AZ
William Marsh is a Psychologist provider in Phoenix, AZ (NPI 1447756234).
Provider details
- NPI number
- 1447756234
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4759 (AZ)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Established profile(68/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 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
300 W Clarendon Ave Ste 470
Phoenix, AZ 85013-3475
Phone: (602) 730-4450
Street-level locationGet directions
Mailing address
300 W Clarendon Ave Ste 470
Phoenix, AZ 85013-3475
Registry dates
- Enumerated
- 2018-04-02
- Last updated
- 2018-04-02
Frequently asked questions
- What is William Marsh's NPI number?
- William Marsh's National Provider Identifier (NPI) is 1447756234, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Marsh's specialty?
- William Marsh is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is William Marsh located?
- William Marsh's practice location on file with NPPES is 300 W Clarendon Ave Ste 470, Phoenix, AZ 85013-3475.
- What is William Marsh's phone number?
- The practice phone number listed in the NPPES registry for William Marsh is (602) 730-4450.
- Is William Marsh's NPI active?
- Yes — William Marsh's NPI (1447756234) is active in the NPPES registry as of the last update on 2018-04-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.