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JOSEPH CHUNGSUN CHAO M.D.
NPI 1992891493
Internal Medicine - Cardiovascular Disease in Mountain View, CA

Active since October 04, 2006PECOS EnrolledAccepts Medicare Assignment
17.71/100
CMS Quality Rating
525 SOUTH DRIVE, SUITE 105, MOUNTAIN VIEW, CA 94040(650) 962-0242 Get Directions Write a Review

NPPES record last updated: April 15, 2024. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Joseph Chungsun Chao M.d. NPPES

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

JOSEPH CHUNGSUN CHAO M.D. (NPI 1992891493) is an individual cardiovascular disease provider in Mountain View, California, licensed in California (A45961) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Stanford, and is a graduate of Other (1976).

NPPES Registry Identity

NPI1992891493
Entity TypeIndividualMale
Primary Taxonomy207RC0000X
Provider Legal NameJOSEPH CHUNGSUN CHAOCredential: M.D.
Location Address525 SOUTH DRIVE, SUITE 105Mountain View, CA 94040-4211
Mailing Address525 South Dr Ste 105Mountain View, CA 94040-4211 · (650) 962-0242 · Fax (650) 962-8657
Phone(650) 962-0242
Sole ProprietorYes
Medical School CMSOtherGraduated 1976
Enumeration DateOctober 4, 2006
Last NPPES UpdateApril 15, 2024
NPPES CertifiedApril 15, 2024
✔ NPI 1992891493 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
License✔ Licensed in CA · A45961
Definition

An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

Also ListedInternal MedicineTaxonomy 207R00000X · License A45961 (CA)
525 SOUTH DRIVE, Mountain View, CA 94040
Open in Google Maps ↗

Secondary Practice Location 1

Location 1300 Pasteur DrStanford, CA 94305-2200 · Phone (650) 723-4000

Other Identifiers 1

Medicaid00A459610CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Joseph Chungsun Chao 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 ID2668508714
PECOS Enrollment IDI20100329000713
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.

Areas of Expertise CMS Part B claims 6

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.

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.
350 services193 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000
An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.
267 services187 patients
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306
This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.
254 services184 patients
Ultrasound of both sides of head and neck blood flow 93880
An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.
253 services186 patients
Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report 93351
This procedure involves using ultrasound technology to create images of your heart while you rest, exercise, or undergo drug-induced stress. An ECG continuously monitors your heart's electrical activity. It helps doctors assess heart health and function.
82 services74 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.
41 services41 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
$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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

17.71/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Individually scored
Quality0
Improvement Activities0
Cost59.06

Reported Quality Measures

Diabetes: Medical Attention for Nephropathy
The percentage of patients 18-75 years of age with diabetes who had a nephropathy screening test or evidence of nephropathy during the measurement period
75%73 patients4/55-star benchmark: 99%
Documentation of Current Medications in the Medical Record
Percentage of visits for patients aged 18 years and older for which the eligible professional or eligible clinician attests to documenting a list of current medications using all immediate resources available on the date of the encounter.
100%1,624 patients5/55-star benchmark: 100%
e-Prescribing
At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.
100%833 patients5/55-star benchmark: 100%
Medication Reconciliation
The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.
100%1,015 patients5/55-star benchmark: 100%
Patient-Specific Education
The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.
99%650 patients4/55-star benchmark: 100%
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
Percentage of patients aged 18 years and older with a BMI documented during the current encounter or during the previous twelve months AND with a BMI outside of normal parameters, a follow-up plan is documented during the encounter or during the previous…
61%647 patients3/55-star benchmark: 97%
Provide Patient Access
At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…
95%650 patients4/55-star benchmark: 100%
Use of High-Risk Medications in the Elderly
Percentage of patients 65 years of age and older who were ordered high-risk medications. Two rates are submitted. 1) Percentage of patients who were ordered at least one high-risk medication.
Lower rates are better for this measure.
Patients 2+: 0% · 239 patients
0%239 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. JENNIFER P WANG MD
Ophthalmology
525 SOUTH DRIVE, SUITE 219
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 969-4600
DR. ROSA LISA DELL'OCA M.D.
Surgery (Plastic and Reconstructive Surgery)
525 SOUTH DRIVE, SUITE 215
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 468-0840
JWANG MEDICAL GROUP, INC.
Ophthalmology
525 SOUTH DRIVE, SUITE 219
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 969-4600
DR. JEAN W HSU O.D.
Optometrist
525 SOUTH DRIVE, SUITE #219
MOUNTAIN VIEW, CA 94040
Santa Clara County (650) 969-4600

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 Joseph Chao's NPI number?

The NPI number for Joseph Chao is 1992891493. It was assigned to this individual provider in the NPPES registry on October 4, 2006.

Where is Joseph Chao located?

Joseph Chao practices at 525 South Drive Suite 105, Mountain View, CA 94040. The listed phone number is (650) 962-0242.

What is Joseph Chao's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is Joseph Chao enrolled in Medicare?

Yes. Joseph Chao 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.

When was this NPI record last updated?

The NPPES record for Joseph Chao was last updated on April 15, 2024. NPI Profile syncs with the weekly NPPES data releases published by CMS.