Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Aaron Mark Sanchez Acosta, DO

Emergency Medicine Physician in Walnut Creek, CA · enumerated 2020.

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

National Provider Identifier

1538789987

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Registry record

Entity type Individual (Type 1)

Name Dr. Aaron Mark Sanchez Acosta

Credential DO

Sex Male

Practice address 1425 S Main St, Walnut Creek, CA, 94596

Phone (925) 295-4000

Enumeration date Apr 24, 2020

Last updated in NPPES Aug 18, 2023

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 20A21247 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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 Aaron Mark Acosta practice?

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

What is the NPI number for Aaron Mark Acosta?

The National Provider Identifier (NPI) for Aaron Mark Acosta is 1538789987, 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 2023-08-18.