What is Phyllis Mast's NPI number?

Phyllis Mast's National Provider Identifier (NPI) is 1265594998, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Phyllis Mast's specialty?

Phyllis Mast is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).

Where is Phyllis Mast located?

Phyllis Mast's practice location on file with NPPES is 1107 S Wall St, Spokane, WA 99204-3745.

What is Phyllis Mast's phone number?

The practice phone number listed in the NPPES registry for Phyllis Mast is (509) 747-5529.

Is Phyllis Mast's NPI active?

Yes — Phyllis Mast's NPI (1265594998) is active in the NPPES registry as of the last update on 2026-05-31.

IndividualActive

Phyllis Mast, PH.D.

NPI 1265594998 · Psychologist · Spokane, WA

Phyllis Mast, PH.D. is a Psychologist provider in Spokane, WA (NPI 1265594998).

Provider details

NPI number: 1265594998
Entity type: Individual
Primary specialty: PsychologistBehavioral Health & Social Service Providers
Credential: PH.D.
Sex: Female
Sole proprietor: Yes
License: 1247 (WA)

Specialties & taxonomies

PsychologistPrimary103T00000XLicense 1247 (WA)
Behavioral Health & Social Service Providers

Profile Score

Detailed profile(90/100 index)

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

1107 S Wall St

Spokane, WA 99204-3745

Phone: (509) 747-5529

Fax: (509) 747-2912

Street-level locationGet directions

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Mailing address