Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron James Simko, MD

Q: What is the NPI number for Aaron Simko?

The National Provider Identifier (NPI) for Aaron Simko is 1548209240, a Type 1 (individual) record in the CMS NPPES registry.

Neonatal-Perinatal Medicine Physician in Stockton, CA · enumerated 2006.

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

National Provider Identifier

1548209240

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Registry record

Entity type Individual (Type 1)

Name Aaron James Simko

Credential MD

Sex Male

Practice address 525 Acacia Street, Neonatal Department, Stockton, CA, 95203

Phone (209) 944-5550

Enumeration date Jun 6, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2080N0001X Neonatal-Perinatal Medicine Physician Allopathic & Osteopathic Physicians · License G627350 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
00G627350	Medicaid	CA	-

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

What is the NPI number for Aaron Simko?

The National Provider Identifier (NPI) for Aaron Simko is 1548209240, a Type 1 (individual) record in the CMS NPPES registry.

Where does Aaron Simko practice?

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

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