MICHELLE YEN MD
NPI 1669934683
Internal Medicine in Mountain View, CA

Q: What is Michelle Yen's NPI number?

The NPI number for Michelle Yen is 1669934683. It was assigned to this individual provider in the NPPES registry on April 1, 2019.

Q: What is Michelle Yen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Michelle Yen was last updated on March 24, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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 01, 2019PECOS EnrolledAccepts Medicare Assignment

2500 GRANT RD, MOUNTAIN VIEW, CA 94040(650) 940-7000 Get Directions Write a Review

NPPES record last updated: March 24, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 24, 2023, Apr 1, 2019 (2 updates tracked since 2019).

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About Michelle Yen Md NPPES

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

MICHELLE YEN MD (NPI 1669934683) is an individual internal medicine provider in Mountain View, California, licensed in California (A182132) and active in the NPI registry since April 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2019).

NPPES Registry Identity

NPI1669934683

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameMICHELLE YENCredential: MD

Location Address2500 GRANT RDMountain View, CA 94040-4302

Mailing Address1078 Danbury DrSan Jose, CA 95129-2917 · (408) 834-2296

Phone(650) 940-7000

Sole ProprietorYes

Medical School CMSOtherGraduated 2019

Enumeration DateApril 1, 2019

Last NPPES UpdateMarch 24, 20232 updates tracked since enumeration

NPPES CertifiedMarch 24, 2023

✔ NPI 1669934683 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CA · A182132

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

2500 GRANT RD, Mountain View, CA 94040

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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

Michelle Yen 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 ID7517332349

PECOS Enrollment IDI20230410001983

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 Michelle Yen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Quantum Bay Area Hospitalist Medical Group Inc

Same address

Hospitalist

2500 GRANT RD
Mountain View, CA 94040

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

NPI 1902279656 (650) 940-7000

Vituity Hospitalists PC

12 mi

Hospitalist

170 ALAMEDA DE LAS PULGAS
Redwood City, CA 94062

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

NPI 1174000533 (650) 369-5811

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 4

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

490 services182 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

261 services110 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

170 services164 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

35 services35 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94040 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

$156.67 typical visit price

range $70.37 – $206.04

Typical copayment $39.16 (range $17.59 – $51.51)

Most-billed visit code 99204

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.

BARBARA MOCNIK APRN

Registered Nurse (Psychiatric/Mental Health, Adult)

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 940-7187

DR. JONATHAN TODD ENGELHARDT MD

Emergency Medicine

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 940-7000

DR. SHAWN MATHEW JACOB MD

Internal Medicine

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 940-7000

NADIA KIRMANI

Student in an Organized Health Care Education/Training Program

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 940-7000

KELLEY DAVIS MS, RD

Dietitian, Registered

2500 GRANT RD, LPCH-4C
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 988-4111

TROY THOAI LAM MD

Internal Medicine

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 374-0001

MAX LEE

Student in an Organized Health Care Education/Training Program

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 940-7000

MS. TOVAH SHOSHANA KROKOSZYNSKI PSYD

Counselor (Mental Health)

2500 GRANT RD
MOUNTAIN VIEW, CA 94040

Santa Clara County (650) 988-3255

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 Michelle Yen's NPI number?

The NPI number for Michelle Yen is 1669934683. It was assigned to this individual provider in the NPPES registry on April 1, 2019.

Where is Michelle Yen located?

Michelle Yen practices at 2500 Grant Rd, Mountain View, CA 94040. The listed phone number is (650) 940-7000.

What is Michelle Yen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Michelle Yen enrolled in Medicare?

Yes. Michelle Yen 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 Michelle Yen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michelle Yen reassigns Medicare benefits to 2 organizations: Quantum Bay Area Hospitalist Medical Group Inc (Mountain View, CA) and Vituity Hospitalists PC (Redwood City, 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 Michelle Yen'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 Michelle Yen was last updated on March 24, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.