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Internal Medicine

David S. Fan, MD

Sees patients in Aliso Viejo, CA · Anaheim, CA · California

Summary

David S. Fan, MD (Internal Medicine) is enrolled with Medicare at 3 practice locations in Aliso Viejo, CA and Anaheim, CA. NPI 1326488040. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(888) 988‑2800 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about David S. Fan, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

3Practice locations
Internal MedicinePrimary specialty
YesAccepts Medicare assignment
YesOffers telehealth
14Years since medical school (graduated 2012)
MaleGender (as listed)
Southern California Permanente Medical GroupGroup practice

Quick answers

Where does David S. Fan see patients?
Medicare's clinician data lists 3 practice locations, including Aliso Viejo, CA and Anaheim, CA. Call before your visit to confirm the address.
What is David S. Fan's specialty?
Medicare lists Internal Medicine as the primary specialty.
Does David S. Fan accept Medicare assignment?
Yes. Medicare's clinician data says David S. Fan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
Does David S. Fan offer telehealth?
Medicare's clinician data says David S. Fan offers telehealth services. Ask the office which visits can be done by video or phone.
What is the phone number for David S. Fan?
(888) 988-2800, as listed in official Medicare / NPI Registry data.
What is David S. Fan's NPI number?
1326488040. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where David S. Fan is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

Medicare enrollment lists David S. Fan as a member of this group (CMS data updated 2026-10-02).

  • Southern California Permanente Medical Group11,293 clinicians in the group

Specialties

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Aliso Viejo

Clinicians with the same Medicare primary specialty in Aliso Viejo, CA — not a recommendation.

All internal medicine doctors in Aliso Viejo →

Clinician information

CredentialMD
Graduation year2012
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1326488040
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians