1. Home
  2. Directory
  3. California
  4. Stanford
  5. Emergency Medicine
  6. NPI Profile

DR. CYNTHIA RAN PENG M.D.
NPI 1952789463
Emergency Medicine in Stanford, CA

Active since May 16, 2015PECOS EnrolledAccepts Medicare Assignment
300 PASTEUR DR, STANFORD, CA 94305(650) 723-4000 Get Directions Write a Review

NPPES record last updated: April 8, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 8, 2022, Jan 10, 2022, Jul 16, 2018 (3 updates tracked since 2018).

About Dr. Cynthia Ran Peng M.d. NPPES

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

DR. CYNTHIA RAN PENG M.D. (NPI 1952789463) is an individual emergency medicine provider in Stanford, California, licensed in California (A153848) and active in the NPI registry since May 2015. She is enrolled in Medicare PECOS and is a graduate of University Of Maryland School Of Medicine (2015).

NPPES Registry Identity

NPI1952789463
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDR. CYNTHIA RAN PENGCredential: M.D.
Location Address300 PASTEUR DRStanford, CA 94305-2200
Mailing Address300 Pasteur DrStanford, CA 94305-2200 · (650) 723-4000
Phone(650) 723-4000
Sole ProprietorNo
Medical School CMSUniversity Of Maryland School Of MedicineGraduated 2015
Enumeration DateMay 16, 2015
Last NPPES UpdateApril 8, 20223 updates tracked since enumeration
NPPES CertifiedApril 8, 2022
✔ NPI 1952789463 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in CA · A153848✔ Licensed in PA · MT208458
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
300 PASTEUR DR, Stanford, CA 94305
Open in Google Maps ↗

Other Names 1

Other Name (5)Cynthia Peng M.d.

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Cynthia Ran Peng M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7214237528
PECOS Enrollment IDI20220421002232, I20250725001764
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 Reassignments

3

Medicare enrollment records show Cynthia Peng reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

County Of Santa Clara
2.0 mi
Mental Health (Including Community Mental Health Center)
231 GRANT AVENUE
Palo Alto, CA 94306
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1588721500 (California), NPI 1629301346 (California)
  • 2,460 clinicians in this Medicare group
NPI 1144330614 (650) 321-5545
Cep America - California
5.3 mi
Emergency Medicine
170 ALAMEDA DE LAS PULGAS
Redwood City, CA 94062
  • Reassigned Medicare billing, California enrollment
  • 2,323 clinicians in this Medicare group
NPI 1487609996 (650) 369-5811
Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc
2,409 mi
Health Maintenance Organization
19450 DEERFIELD AVE
Lansdowne, VA 20176
NPI 1225156367 (703) 726-2100

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 94305 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
$106.47 typical visit price
range $70.37 – $206.04
Typical copayment $26.61 (range $17.59 – $51.51)
Most-billed visit code 99203
Established Patient
$121.77 typical visit price
range $23.96 – $169.60
Typical copayment $30.44 (range $5.99 – $42.40)
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.

PRISTA CHARUWORN MD
Internal Medicine (Gastroenterology)
300 PASTEUR DR, ALWAY BUILD M211, MC 5187
STANFORD, CA 94305
Santa Clara County (650) 723-6661
ANDREW CHARLES PICEL M.D
Radiology (Vascular & Interventional Radiology)
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
MATTHEW A WRIGHT M.D. PH.D.
Psychiatry & Neurology (Psychiatry)
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
DR. QUAZI ZUBAIR AL-TARIQ M.D.
Radiology (Diagnostic Radiology)
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
ANGIE DEE MURKINS NP
Nurse Practitioner
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
DR. JAMSHID GHAJAR MD PHD
Neurological Surgery
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000
SARA BAKHTARY M.D.
Pathology (Anatomic Pathology & Clinical Pathology)
300 PASTEUR DR, LANE 235
STANFORD, CA 94305
Santa Clara County (650) 723-5252
YU KUANG LAI MD
Internal Medicine (Critical Care Medicine)
300 PASTEUR DR
STANFORD, CA 94305
Santa Clara County (650) 723-4000

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 Cynthia Peng's NPI number?

The NPI number for Cynthia Peng is 1952789463. It was assigned to this individual provider in the NPPES registry on May 16, 2015. The provider is also known as Cynthia Peng M.D..

Where is Cynthia Peng located?

Cynthia Peng practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.

What is Cynthia Peng's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Cynthia Peng enrolled in Medicare?

Yes. Cynthia Peng is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Cynthia Peng's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Cynthia Peng reassigns Medicare benefits to 3 organizations: County Of Santa Clara (Palo Alto, CA), Cep America - California (Redwood City, CA) and Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (Lansdowne, VA). Each 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 Cynthia Peng'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 Cynthia Peng was last updated on April 8, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.