What is Tammy Vanderwerf's NPI number?

Tammy Vanderwerf's National Provider Identifier (NPI) is 1336013978, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Tammy Vanderwerf's specialty?

Tammy Vanderwerf is listed in the NPPES registry with a primary specialty of Doula (Nursing Service Related Providers).

Where is Tammy Vanderwerf located?

Tammy Vanderwerf's practice location on file with NPPES is 1600 Aspen Dr, Waterloo, IA 50701-3567.

What is Tammy Vanderwerf's phone number?

The practice phone number listed in the NPPES registry for Tammy Vanderwerf is (319) 610-1465.

Is Tammy Vanderwerf's NPI active?

Yes — Tammy Vanderwerf's NPI (1336013978) is active in the NPPES registry as of the last update on 2025-10-04.

IndividualActive

Tammy Vanderwerf

NPI 1336013978 · Doula · Waterloo, IA

Tammy Vanderwerf is a Doula provider in Waterloo, IA (NPI 1336013978).

Provider details

NPI number: 1336013978
Entity type: Individual
Primary specialty: DoulaNursing Service Related Providers
Sex: Female
Sole proprietor: Yes

Specialties & taxonomies

DoulaPrimary374J00000X
Nursing Service Related Providers

Profile Score

Basic profile(47/100 index)

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
83% 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

1600 Aspen Dr

Waterloo, IA 50701-3567

Phone: (319) 610-1465

Street-level locationGet directions

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Mailing address