Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Blake Rainie Slack, CNM, WHNP

Q: What is the NPI number for Blake Slack?

The National Provider Identifier (NPI) for Blake Slack is 1003055591, a Type 1 (individual) record in the CMS NPPES registry.

Advanced Practice Midwife in Boston, MA · enumerated 2009.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1003055591

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Registry record

Entity type Individual (Type 1)

Name Mrs. Blake Rainie Slack

Credential CNM, WHNP

Sex Female

Practice address 55 Fruit St, Founders 454, Massachusetts General Hospital, Boston, MA, 02114

Phone (617) 726-2033

Enumeration date Feb 7, 2009

Last updated in NPPES Apr 28, 2016

Taxonomy & licenses

176B00000X Midwife Other Service Providers · License AC000650 (MD) Secondary

176B00000X Midwife Other Service Providers · License 283129 (MA) Secondary

367A00000X Advanced Practice Midwife Physician Assistants & Advanced Practice Nursing Providers · License RN283129 (MA) Primary

363LW0102X Women's Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN283129 (MA) Secondary

CNM · Certified Nurse Midwife: An advanced practice nurse specializing in pregnancy, childbirth, and reproductive care. About the CNM credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Blake Slack practice?

The practice location on file with NPPES is in Boston, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Blake Slack?

The National Provider Identifier (NPI) for Blake Slack is 1003055591, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-04-28.