EON JOSEPH RIOS MD
NPI 1942526389
Dermatology in Stanford, CA

Q: What is Eon Rios's NPI number?

The NPI number for Eon Rios is 1942526389. It was assigned to this individual provider in the NPPES registry on April 9, 2010.

Q: What is Eon Rios's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Q: When was this NPI record last updated?

The NPPES record for Eon Rios was last updated on April 16, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.

Active since April 09, 2010PECOS EnrolledAccepts Medicare Assignment

300 PASTEUR DR, STANFORD, CA 94305(650) 723-4000 Get Directions Write a Review

NPPES record last updated: April 16, 2024. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Apr 16, 2024, Aug 23, 2022, Sep 20, 2018 (3 updates tracked since 2018).

On this page

About Eon Joseph Rios Md NPPES

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

EON JOSEPH RIOS MD (NPI 1942526389) is an individual dermatology provider in Stanford, California, licensed in California (A117533) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Jose, and is a graduate of Stanford University School Of Medicine (2010).

NPPES Registry Identity

NPI1942526389

Entity TypeIndividualMale

Primary Taxonomy207N00000X

Provider Legal NameEON JOSEPH RIOSCredential: MD

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 CMSStanford University School Of MedicineGraduated 2010

Enumeration DateApril 9, 2010

Last NPPES UpdateApril 16, 20243 updates tracked since enumeration

NPPES CertifiedApril 16, 2024

✔ NPI 1942526389 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians

Taxonomy Code207N00000X

License✔ Licensed in CA · A117533

Definition

A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.

300 PASTEUR DR, Stanford, CA 94305

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Secondary Practice Location 1

Location 1751 S Bascom Ave, Dept of Medicine, 4th flSan Jose, CA 95128-2604 · Phone (408) 885-5105

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include HMSA.Insurance ›

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

Eon Joseph Rios 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 ID5991029605

PECOS Enrollment IDI20150128000384

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

Medicare enrollment records show Eon Rios reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Sutter Bay Medical Foundation

0.9 mi

Multi-Specialty

795 EL CAMINO REAL
Palo Alto, CA 94301

Reassigned Medicare billing, California enrollment
4,479 clinicians in this Medicare group

NPI 1013950807 (650) 321-4121

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

Direct Dermatology Professionals PC

57 mi

Dermatology

165 SAINT DOMINICS DR STE 120
Manteca, CA 95337

Reassigned Medicare billing, California enrollment
12 clinicians in this Medicare group

NPI 1417263922 (510) 241-2884

Csi Medical Group

335 mi

MOHS-Micrographic Surgery

1360 W 6TH ST STE 370
San Pedro, CA 90732

Reassigned Medicare billing, California enrollment
179 clinicians in this Medicare group

NPI 1871909804 (310) 519-8890

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

Areas of Expertise CMS Part B claims 18

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Destruction of precancer skin growth, 2-14 growths 17003

This procedure involves removing 2-14 precancerous skin growths. The growths are treated to prevent them from potentially developing into skin cancer. The process is safe, with minimal discomfort, and promotes healthier skin.

491 services111 patients

Destruction of precancer skin growth, 2-14 growths 17003

164 services31 patients

Destruction of precancer skin growth, 1 growth 17000

"Destruction of precancer skin growth" is a procedure that eliminates a single precancerous skin growth. This is done to prevent it from developing into skin cancer. The growth may be removed using various methods such as cryotherapy (freezing), laser therapy, or topical medications.

149 services136 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

142 services120 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

123 services120 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

116 services90 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

95 services95 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

72 services72 patients

Destruction of skin growth, 1-14 growths 17110

"Destruction of skin growth" refers to a procedure where 1-14 abnormal skin growths are removed. This is done using methods such as freezing, burning, or laser therapy. It helps prevent the growth from causing discomfort or turning into a more serious condition.

60 services57 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

53 services49 patients

Destruction of precancer skin growth, 1 growth 17000

48 services39 patients

Biopsy of related skin growth, first growth 11102

A biopsy of a skin growth involves taking a small sample of the growth to examine it under a microscope. This helps determine if the growth is harmful. The procedure is typically quick, with minimal discomfort. It's a crucial step in ensuring your skin's health.

44 services42 patients

Biopsy of related skin growth, first growth 11102

30 services27 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

17 services16 patients

Destruction of skin growth, 1-14 growths 17110

15 services15 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

14 services14 patients

Injection into skin growth, 1-7 growths 11900

This procedure involves injecting medication into 1-7 skin growths. The medication helps to reduce the size of the growths or completely eliminate them. It's a simple, quick, and usually painless process performed by a medical professional.

13 services11 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

12 services11 patients

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

$86.56 typical visit price

range $23.96 – $169.60

Typical copayment $21.64 (range $5.99 – $42.40)

Most-billed visit code 99213

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 Eon Rios's NPI number?

The NPI number for Eon Rios is 1942526389. It was assigned to this individual provider in the NPPES registry on April 9, 2010.

Where is Eon Rios located?

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

What is Eon Rios's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Eon Rios enrolled in Medicare?

Yes. Eon Rios 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 Eon Rios's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Eon Rios reassigns Medicare benefits to 4 organizations: Sutter Bay Medical Foundation (Palo Alto, CA), County Of Santa Clara (Palo Alto, CA), Direct Dermatology Professionals PC (Manteca, CA) and Csi Medical Group (San Pedro, 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 Eon Rios's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Eon Rios accept?

Health plans from HMSA list Eon Rios as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Eon Rios was last updated on April 16, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.