JAMES YENMING CHAO M.D.
NPI 1144455940
Internal Medicine - Cardiovascular Disease in Mountain View, CA
NPI Status: Active since May 22, 2009
Contact Information
525 SOUTH DR STE 105
MOUNTAIN VIEW, CA
ZIP 94040
Phone: (650) 962-0242
Fax: (650) 962-8657
- Individual
- Male
- Years of Experience 17
- Internal Medicine
- Cardiovascular Disease
- May Accept Medicare Approved Payment
- PECOS Enrolled
About JAMES CHAO
This page provides the complete NPI Profile along with additional information for James Chao, an internist established in Mountain View, California with a medical specialization in Internal Medicine, focusing in cardiovascular disease and more than 17 years of experience. He graduated from Oregon Health Sciences University School Of Medicine in 2009. The healthcare provider is registered in the NPI registry with number 1144455940 assigned on May 2009. The practitioner's primary taxonomy code is 207RC0000X with license number A118680 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1144455940
- Provider Name
- JAMES YENMING CHAO M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 525 SOUTH DR STE 105 MOUNTAIN VIEW, CA 94040
- Location Phone
- (650) 962-0242
- Location Fax
- (650) 962-8657
- Mailing Address
- 525 SOUTH DR STE 105 MOUNTAIN VIEW, CA 94040
- Mailing Phone
- (650) 962-0242
- Mailing Fax
- (650) 962-8657
- Medical School Name
- OREGON HEALTH SCIENCES UNIVERSITY SCHOOL OF MEDICINE
- Graduation Year
- 2009
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 05-22-2009
- Last Update Date
- 04-15-2024
- Code Navigator
An internist like James Chao is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
Location Map
Secondary Locations
- 300 Pasteur Dr
Stanford, CA 94305
(650) 723-4000
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Internal Medicine Cardiovascular Disease
- Taxonomy Code
- 207RC0000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A118680
- License State
- CA
- Taxonomy Description
- 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.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 207R00000X | Allopathic & Osteopathic Physicians | Internal Medicine | A118680 (CA) |
| 2 | 207RI0011X | Allopathic & Osteopathic Physicians | Internal Medicine | A118680 (CA) |
| 3 | 207UN0901X | Allopathic & Osteopathic Physicians | Nuclear Medicine | A118680 (CA) |
Medicare Participation & PECOS Enrollment Status
James Chao is registered with Medicare but maybe doesn't accept claims assignment. If you are a Medicare beneficiary call and confirm with the provider before seeking any services.
James Chao is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
PECOS PAC ID: 8325369010
What is the PECOS Associate Control ID?
A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.PECOS Enrollment ID: I20150605002713
What is the Provider Enrollment ID?
The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.Accepts Medicare Assignment? Maybe
What does it mean "accepts medicare assignment"?
When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Critical care, first 30-74 minutes
Established patient office or other outpatient visit, 40-54 minutes
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician
Follow-up hospital inpatient care per day, typically 35 minutes
Heart rhythm recording of continous external ekg over 8-15 days
Heart rhythm review and interpretation of continous external ekg over 8-15 days
Initial hospital inpatient care per day, typically 50 minutes
Initial hospital observation care per day, typically 50 minutes
Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito
New patient office or other outpatient visit, 45-59 minutes
New patient office or other outpatient visit, 60-74 minutes
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
Telehealth originating site facility fee
Telephone medical discussion with physician, 5-10 minutes
Ultrasound of heart
Ultrasound of heart blood flow, valves and chambers, follow-up
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
Ultrasound of heart, follow-up
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
This service was performed 127 times for 44 patientsThis service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
This service was performed 546 times for 295 patientsAn exercise or drug-induced heart stress test with ECG is a procedure to assess how your heart functions under stress. It can involve exercising or medication to make your heart work harder while an ECG records its activity. A physician reviews the results.
This service was performed 44 times for 44 patientsAn exercise or drug-induced heart stress test with ECG involves monitoring your heart's activity while it's under stress, either from exercise or medication. A doctor supervises the entire procedure to ensure safety and accuracy in results. This test helps detect heart problems.
This service was performed 22 times for 22 patientsFollow-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.
This service was performed 361 times for 137 patientsA heart rhythm recording is a non-invasive procedure where a small device, attached externally, monitors your heart's electrical activity for 8-15 days. It helps detect irregular heart rhythms, assess heart rate, and guide treatment decisions. It's safe, painless, and can be done during normal daily activities.
This service was performed 40 times for 40 patientsThis service involves wearing a device for 8-15 days that continuously records your heart's electrical activity. It helps in identifying irregular heart rhythms. The recorded data is then reviewed and interpreted by a healthcare professional for any abnormalities.
This service was performed 77 times for 77 patientsInitial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
This service was performed 91 times for 82 patientsInitial hospital observation care is a service where healthcare professionals monitor your health for about 50 minutes daily. This helps them understand your condition better, plan treatment, and ensure your safety. It's a routine part of hospital care.
This service was performed 17 times for 17 patientsThis procedure involves placing a tube into your left lower heart chamber and coronary artery. It helps doctors diagnose heart conditions by allowing them to view these areas in detail. A radiologist will review the images to ensure accurate diagnosis.
This service was performed 13 times for 13 patientsModerate sedation is a method where a physician uses medication to help you relax during a gastrointestinal endoscopy. An independent trained observer will be present to monitor your vital signs and ensure your safety throughout the procedure. It's a common and safe practice.
This service was performed 16 times for 15 patientsThis 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.
This service was performed 179 times for 179 patientsThis is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
This service was performed 19 times for 19 patientsAn 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.
This service was performed 67 times for 63 patientsA routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
This service was performed 20 times for 20 patientsThe Telehealth originating site facility fee is a charge for the location where you receive your telehealth service, such as a clinic or hospital. It covers costs like equipment use, technical support, and other resources needed to provide a secure, effective telehealth visit.
This service was performed 56 times for 54 patientsA telephone medical discussion with a physician is a brief, 5-10 minute call where you can discuss your health concerns. It's a convenient way to receive medical advice without needing to visit a clinic. It's important to prepare questions in advance to make the most of this time.
This service was performed 47 times for 44 patientsAn ultrasound of the heart, also known as an echocardiogram, is a non-invasive procedure that uses sound waves to create images of your heart. This test allows your doctor to monitor how your heart and its valves are functioning. It's a safe, painless process that can help diagnose heart conditions.
This service was performed 50 times for 50 patientsThis procedure, an echocardiogram, uses sound waves to create images of your heart. It aids in assessing your heart's blood flow, chambers, and valves. It's a follow-up procedure, ensuring that your heart is functioning properly post-treatment.
This service was performed 32 times for 29 patientsThis 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.
This service was performed 172 times for 166 patientsThis 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.
This service was performed 154 times for 152 patientsA follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.
This service was performed 37 times for 34 patientsPhysician Visit Costs
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 94040 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $156.67
- Minimum New Patient Price $70.37
- Maximum New Patient Price $206.04
- Average New Patient Copayment $39.16
- Minimum New Patient Copayment $17.59
- Maximum New Patient Copayment $51.51
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99213
- Average Established Patient Price $86.56
- Minimum Established Patient Price $23.96
- Maximum Established Patient Price $169.6
- Average Established Patient Copayment $21.64
- Minimum Established Patient Copayment $5.99
- Maximum Established Patient Copayment $42.4
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 1 | 4 | 4 | 4 | 5 | 5 | 9 | 4 | 0 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 1 | 8 | 4 | 8 | 5 | 10 | 9 | 8 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 1 + 8 + 4 + 8 + 5 + 1 + 0 + 9 + 8 + 24 = 70 | |||||||||
| Step 3: because the number obtained in step 2 ends in zero, the check digit is zero. | |||||||||
| 0 | |||||||||
The NPI number 1144455940 is valid because the calculated check digit 0 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following provider is registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1245935352 | JOSEPH C. CHAO, M.D. CARDIOLOGY CLINIC Organization | Internal Medicine (Cardiovascular Disease) | 525 SOUTH DR STE 105 MOUNTAIN VIEW, CA 94040 (650) 962-0242 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1144455940, enumerated in the NPI registry as an "individual" on May 22, 2009
The provider is located at 525 South Dr Ste 105 Mountain View, Ca 94040 and the phone number is (650) 962-0242
The provider's speciality is Internal Medicine with taxonomy code 207RC0000X with a focus in Cardiovascular Disease
The provider has more than 17 years of experience. He graduated from Oregon Health Sciences University School Of Medicine in 2009.
Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
Medicare beneficiaries should expect a typical cost of $156.67 with an average copayment of $39.16 for new patient appointments. Established patients should expect a typical charge of $86.56 and an average copayment of 21.64. Please review your insurance plan or contact the provider directly to determine your specific costs.
The most common procedures or services performed by this practitioner are: Critical care, first 30-74 minutes, Established patient office or other outpatient visit, 40-54 minutes, Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician, Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician, Follow-up hospital inpatient care per day, typically 35 minutes, Heart rhythm recording of continous external ekg over 8-15 days, Heart rhythm review and interpretation of continous external ekg over 8-15 days, Initial hospital inpatient care per day, typically 50 minutes, Initial hospital observation care per day, typically 50 minutes, Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist, Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito, New patient office or other outpatient visit, 45-59 minutes, New patient office or other outpatient visit, 60-74 minutes, Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report, Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only, Telehealth originating site facility fee, Telephone medical discussion with physician, 5-10 minutes, Ultrasound of heart, Ultrasound of heart blood flow, valves and chambers, follow-up, Ultrasound of heart with color-depicted blood flow, rate, direction and valve function, Ultrasound of heart with color-depicted blood flow, rate, direction and valve function and Ultrasound of heart, follow-up.
This NPI record was last updated on May 22, 2009. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
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