Katherine Blumstein, PHD
NPI 1174484323 · Clinical Psychologist · Mercer Island, WA
Katherine Blumstein, PHD is a Clinical Psychologist provider in Mercer Island, WA (NPI 1174484323).
Provider details
- NPI number
- 1174484323
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Female
- Sole proprietor
- Yes
- License
- PY61434956 (WA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in 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
- 2025-11-18
- Last updated
- 2025-11-18
- Certified
- 2025-11-18
Frequently asked questions
- What is Katherine Blumstein's NPI number?
- Katherine Blumstein's National Provider Identifier (NPI) is 1174484323, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Blumstein's specialty?
- Katherine Blumstein is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Katherine Blumstein located?
- Katherine Blumstein's practice location on file with NPPES is 8241 Se 30th St, Mercer Island, WA 98040-3005.
- What is Katherine Blumstein's phone number?
- The practice phone number listed in the NPPES registry for Katherine Blumstein is (206) 465-9657.
- Is Katherine Blumstein's NPI active?
- Yes — Katherine Blumstein's NPI (1174484323) is active in the NPPES registry as of the last update on 2025-11-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.