What is Cathy Sizer's NPI number?

Cathy Sizer's National Provider Identifier (NPI) is 1467449512, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Cathy Sizer's specialty?

Cathy Sizer is listed in the NPPES registry with a primary specialty of Pediatric Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).

Where is Cathy Sizer located?

Cathy Sizer's practice location on file with NPPES is 133 Littleton Rd, Westford, MA 01886-3198.

What is Cathy Sizer's phone number?

The practice phone number listed in the NPPES registry for Cathy Sizer is (978) 577-0437.

Is Cathy Sizer's NPI active?

Yes — Cathy Sizer's NPI (1467449512) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

Cathy Sizer, NP

NPI 1467449512 · Pediatric Nurse Practitioner · Westford, MA

Cathy Sizer, NP is a Pediatric Nurse Practitioner provider in Westford, MA (NPI 1467449512).

Provider details

NPI number: 1467449512
Entity type: Individual
Primary specialty: Pediatric Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Credential: NP
Sex: Female
License: 153270 (MA)

Specialties & taxonomies

Pediatric Nurse PractitionerPrimary363LP0200XLicense 153270 (MA)
Physician Assistants & Advanced Practice Nursing Providers

Profile Score

Detailed profile(91/100 index)

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

Registry tenure38% of score
20 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

133 Littleton Rd

Suite 101

Westford, MA 01886-3198

Phone: (978) 577-0437

Fax: (978) 692-9904

Approximate (ZIP-level) locationGet directions

More MA providers

Mailing address

346 Bacon St

Waltham, MA 02451-7516

Enumerated: 2005-10-04
Last updated: 2007-07-08

Frequently asked questions

What is Cathy Sizer's NPI number?: Cathy Sizer's National Provider Identifier (NPI) is 1467449512, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Cathy Sizer's specialty?: Cathy Sizer is listed in the NPPES registry with a primary specialty of Pediatric Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
Where is Cathy Sizer located?: Cathy Sizer's practice location on file with NPPES is 133 Littleton Rd, Westford, MA 01886-3198.
What is Cathy Sizer's phone number?: The practice phone number listed in the NPPES registry for Cathy Sizer is (978) 577-0437.
Is Cathy Sizer's NPI active?: Yes — Cathy Sizer's NPI (1467449512) is active in the NPPES registry as of the last update on 2007-07-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.