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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.

STEPHEN MOCK DO
NPI 1104528900
Pediatrics in Antioch, CA

Active since March 17, 2023PECOS Enrolled
4501 SAND CREEK RD, ANTIOCH, CA 94531(925) 813-6500 Get Directions Write a Review

NPPES record last updated: October 3, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 3, 2026, Mar 17, 2023 (2 updates tracked since 2023).

About Stephen Mock Do NPPES

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

STEPHEN MOCK DO (NPI 1104528900) is an individual pediatrics provider in Antioch, California, licensed in California (24911) and active in the NPI registry since March 2023. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1104528900
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameSTEPHEN MOCKCredential: DO
Location Address4501 SAND CREEK RDAntioch, CA 94531-8687
Mailing Address4501 Sand Creek RdAntioch, CA 94531-8687 · (925) 813-6500
Phone(925) 813-6500
Sole ProprietorNo
Enumeration DateMarch 17, 2023
Last NPPES UpdateOctober 3, 20262 updates tracked since enumeration
NPPES CertifiedOctober 3, 2026
✔ NPI 1104528900 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · 24911
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
4501 SAND CREEK RD, Antioch, CA 94531
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stephen Mock Do 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94531 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KRISTEN ASAKO SHIMODA PHARMD
Pharmacist (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist)
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-7280
DR. KAUSALYA CHENNAPRAGADA BHASKARABHATLA M.D.
Internal Medicine
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-6500
JEFFREY ROBERT CHAVEZ PA-C
Physician Assistant
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 389-7719
DR. JAMES FRANCIS CHAN M.D.
Hospitalist
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-6500
JACOB FREDRICKSON DPT
Physical Therapist
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-6500
MENG HAO
Pharmacist
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-6500
TIMOTHY VAN PHAN
Pharmacist
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-6500
SHARON ANN LEWIS RRT
Respiratory Therapist, Registered
4501 SAND CREEK RD
ANTIOCH, CA 94531
Contra Costa County (925) 813-6700

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 Stephen Mock's NPI number?

The NPI number for Stephen Mock is 1104528900. It was assigned to this individual provider in the NPPES registry on March 17, 2023.

Where is Stephen Mock located?

Stephen Mock practices at 4501 Sand Creek Rd, Antioch, CA 94531. The listed phone number is (925) 813-6500.

What is Stephen Mock's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Stephen Mock enrolled in Medicare?

Yes. Stephen Mock is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Stephen Mock was last updated on October 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 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.