Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Crystal Dawn Oster, CNM

Advanced Practice Midwife in Santa Rosa, CA · enumerated 2006.

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

National Provider Identifier

1578626651

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Registry record

Entity type Individual (Type 1)

Name Crystal Dawn Oster

Credential CNM

Sex Female

Practice address 401 Bicentennial Way, Santa Rosa, CA, 95403

Phone (707) 571-4632

Enumeration date Dec 19, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

367A00000X Advanced Practice Midwife Physician Assistants & Advanced Practice Nursing Providers · License 713 (CA) Primary

367A00000X Advanced Practice Midwife Physician Assistants & Advanced Practice Nursing Providers · License AP2324 (AZ) 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 Crystal Oster practice?

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

What is the NPI number for Crystal Oster?

The National Provider Identifier (NPI) for Crystal Oster is 1578626651, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.