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ERUM ANSARI MD
NPI 1881830883
Pediatrics in San Ramon, CA

Active since December 21, 2008PECOS Enrolled
200 PORTER DR STE 300, SAN RAMON, CA 94583(925) 838-6511 Get Directions Write a Review

NPPES record last updated: January 23, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 23, 2023, May 4, 2022 (2 updates tracked since 2022).

About Erum Ansari Md NPPES

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

ERUM ANSARI MD (NPI 1881830883) is an individual pediatrics provider in San Ramon, California, licensed in California (A 102069) and active in the NPI registry since December 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1881830883
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameERUM ANSARICredential: MD
Location Address200 PORTER DR STE 300San Ramon, CA 94583-1524
Mailing Address1450 Treat Blvd Ste 300Walnut Creek, CA 94597-2168 · (925) 952-2888 · Fax (925) 275-0488
Phone(925) 838-6511
Sole ProprietorYes
Enumeration DateDecember 21, 2008
Last NPPES UpdateJanuary 23, 20252 updates tracked since enumeration
NPPES CertifiedJanuary 23, 2025
✔ NPI 1881830883 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · A 102069
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.
200 PORTER DR STE 300, San Ramon, CA 94583
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Erum Ansari 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.

Medicare Billing Reassignment

Medicare enrollment records show Erum Ansari reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

John Muir Physician Network
11 mi
General Practice
1450 TREAT BLVD, SUITE 300
Walnut Creek, CA 94597
  • Reassigned Medicare billing, California enrollment
  • 650 clinicians in this Medicare group
NPI 1841407665 (925) 296-9872

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94583 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

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

DR. ANDREW CHEUNG D.O.
Family Medicine
200 PORTER DR STE 300
SAN RAMON, CA 94583
Contra Costa County (925) 838-6511

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 Erum Ansari's NPI number?

The NPI number for Erum Ansari is 1881830883. It was assigned to this individual provider in the NPPES registry on December 21, 2008.

Where is Erum Ansari located?

Erum Ansari practices at 200 Porter Dr Ste 300, San Ramon, CA 94583. The listed phone number is (925) 838-6511.

What is Erum Ansari's specialty?

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

Is Erum Ansari enrolled in Medicare?

Yes. Erum Ansari is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Erum Ansari's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Erum Ansari reassigns Medicare benefits to John Muir Physician Network (Walnut Creek, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Erum Ansari's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Erum Ansari was last updated on January 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.