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DIANE HAN MD
NPI 1700465721
Emergency Medicine in Palo Alto, CA

Active since April 06, 2021PECOS EnrolledAccepts Medicare Assignment
900 WELCH RD STE 350, PALO ALTO, CA 94304(408) 981-2115 Get Directions Write a Review

NPPES record last updated: January 2, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 2, 2025, Apr 6, 2021 (2 updates tracked since 2021).

About Diane Han Md NPPES

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

DIANE HAN MD (NPI 1700465721) is an individual emergency medicine provider in Palo Alto, California, licensed in California (A190408) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS and is a graduate of Other (2021).

NPPES Registry Identity

NPI1700465721
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDIANE HANCredential: MD
Location Address900 WELCH RD STE 350Palo Alto, CA 94304-1807
Mailing Address900 Welch Rd Ste 350Palo Alto, CA 94304-1807 · (408) 981-2115
Phone(408) 981-2115
Sole ProprietorNo
Medical School CMSOtherGraduated 2021
Enumeration DateApril 6, 2021
Last NPPES UpdateJanuary 2, 20252 updates tracked since enumeration
NPPES CertifiedJanuary 2, 2025
✔ NPI 1700465721 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A190408
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.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
900 WELCH RD STE 350, Palo Alto, CA 94304
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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 and accepts Medicare assignment

Diane Han Md 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 ID5395273270
PECOS Enrollment IDI20250106001334
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 Diane Han 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
2.1 mi
Mental Health (Including Community Mental Health Center)
231 GRANT AVENUE
Palo Alto, CA 94306
  • Reassigned Medicare billing, California enrollment
  • 2,460 clinicians in this Medicare group
NPI 1144330614 (650) 321-5545
Cep America - California
5.1 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
Emergency Physicians Associates San Jose PC
15 mi
Emergency Medicine
2105 FOREST AVE
San Jose, CA 95128
  • Reassigned Medicare billing, California enrollment
  • 197 clinicians in this Medicare group
NPI 1306311576 (408) 947-2500

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 94304 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.

THAMANNA NISHATH
Student in an Organized Health Care Education/Training Program
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 723-6576
PETER DAVIS-ALLEN MD
Emergency Medicine
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 723-6576
MS. URSULA DEAN BSN, RN, MSN, NP
Nurse Practitioner (Family)
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 724-3254
BRENDA IRENE CASTOLO AGACNP-BC
Nurse Practitioner
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 723-6576
THOMAS YAN
Student in an Organized Health Care Education/Training Program
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 723-9215
SAMANTHA IZUNO MD
Emergency Medicine
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 723-6576
GABRIELA FUENTES
Student in an Organized Health Care Education/Training Program
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (650) 723-6576
JACOB ANEES RAZZOUK
Student in an Organized Health Care Education/Training Program
900 WELCH RD STE 350
PALO ALTO, CA 94304
Santa Clara County (909) 633-8143

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 Diane Han's NPI number?

The NPI number for Diane Han is 1700465721. It was assigned to this individual provider in the NPPES registry on April 6, 2021.

Where is Diane Han located?

Diane Han practices at 900 Welch Rd Ste 350, Palo Alto, CA 94304. The listed phone number is (408) 981-2115.

What is Diane Han's specialty?

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

Is Diane Han enrolled in Medicare?

Yes. Diane Han 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 Diane Han's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Diane Han reassigns Medicare benefits to 3 organizations: County Of Santa Clara (Palo Alto, CA), Cep America - California (Redwood City, CA) and Emergency Physicians Associates San Jose PC (San Jose, CA). 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 Diane Han'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 Diane Han was last updated on January 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.