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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

AARON JAMES SIMKO MD
NPI 1548209240
Pediatrics - Neonatal-Perinatal Medicine in Stockton, CA

Active since June 06, 2006PECOS Enrolled
525 ACACIA STREET, NEONATAL DEPARTMENT, STOCKTON, CA 95203(209) 944-5550 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

About Aaron James Simko Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

AARON JAMES SIMKO MD (NPI 1548209240) is an individual neonatal-perinatal medicine provider in Stockton, California, licensed in California (G627350) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1548209240
Entity TypeIndividualMale
Primary Taxonomy2080N0001X
Provider Legal NameAARON JAMES SIMKOCredential: MD
Location Address525 ACACIA STREET, NEONATAL DEPARTMENTStockton, CA 95203
Mailing Address1524 Mchenry Ave, Suite 150Modesto, CA 95350 · (209) 571-8330 · Fax (209) 491-7184
Phone(209) 944-5550
Sole ProprietorNo
Enumeration DateJune 6, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1548209240 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Neonatal-Perinatal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080N0001X
License✔ Licensed in CA · G627350
Definition
A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies.
525 ACACIA STREET, Stockton, CA 95203
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Other Identifiers 1

Medicaid00G627350CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Aaron James Simko Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Aaron Simko's NPI number?

The NPI number for Aaron Simko is 1548209240. It was assigned to this individual provider in the NPPES registry on June 6, 2006.

Where is Aaron Simko located?

Aaron Simko practices at 525 Acacia Street Neonatal Department, Stockton, CA 95203. The listed phone number is (209) 944-5550.

What is Aaron Simko's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Is Aaron Simko enrolled in Medicare?

Yes. Aaron Simko is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Aaron Simko was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 53 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.