IndividualActive
William Marks, PH.D.
NPI 1659650232 · Psychologist · Honolulu, HI
William Marks, PH.D. is a Psychologist provider in Honolulu, HI (NPI 1659650232).
Provider details
- NPI number
- 1659650232
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- PSY 1266 (HI)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(86/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 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
1441 Kapiolani Blvd
Honolulu, HI 96814-4402
Phone: (808) 432-7600
Street-level locationGet directions
Mailing address
1441 Kapiolani Blvd
Honolulu, HI 96814-4402
Additional practice locations (1)
- 1314 S King St Ste 864Honolulu, HI 96814-1943Phone: (808) 596-8899Fax: (808) 596-8899
Registry dates
- Enumerated
- 2011-08-12
- Last updated
- 2021-06-01
- Certified
- 2021-06-01
Frequently asked questions
- What is William Marks's NPI number?
- William Marks's National Provider Identifier (NPI) is 1659650232, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Marks's specialty?
- William Marks is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is William Marks located?
- William Marks's practice location on file with NPPES is 1441 Kapiolani Blvd, Honolulu, HI 96814-4402.
- What is William Marks's phone number?
- The practice phone number listed in the NPPES registry for William Marks is (808) 432-7600.
- Is William Marks's NPI active?
- Yes — William Marks's NPI (1659650232) is active in the NPPES registry as of the last update on 2021-06-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.