What is Matthew Garthwait's NPI number?

Matthew Garthwait's National Provider Identifier (NPI) is 1578929337, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Matthew Garthwait's specialty?

Matthew Garthwait is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).

Where is Matthew Garthwait located?

Matthew Garthwait's practice location on file with NPPES is 1245 Washington Rd, Rye, NH 03870-2339.

What is Matthew Garthwait's phone number?

The practice phone number listed in the NPPES registry for Matthew Garthwait is (603) 969-7842.

Is Matthew Garthwait's NPI active?

Yes — Matthew Garthwait's NPI (1578929337) is active in the NPPES registry as of the last update on 2026-01-14.

IndividualActive

Matthew Garthwait

NPI 1578929337 · Clinical Social Worker · Rye, NH

Matthew Garthwait is a Clinical Social Worker provider in Rye, NH (NPI 1578929337).

Provider details

NPI number: 1578929337
Entity type: Individual
Primary specialty: Clinical Social WorkerBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: Yes
License: 2399 (NH)

Specialties & taxonomies

Clinical Social WorkerPrimary1041C0700XLicense 2399 (NH)
Behavioral Health & Social Service Providers

Profile Score

Established profile(72/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
10 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

1245 Washington Rd

Rye, NH 03870-2339

Phone: (603) 969-7842

Street-level locationGet directions

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Mailing address