DR. JUSTIN T MAO MD
NPI 1427052273
Internal Medicine - Clinical Cardiac Electrophysiology in Downers Grove, IL
NPI Status: Active since June 09, 2005
Contact Information
3825 HIGHLAND AVE FL TOWER24
DOWNERS GROVE, IL
ZIP 60515
Phone: (630) 719-4799
Fax: (630) 963-7420
- Individual
- Male
- Years of Experience 25
- Internal Medicine
- Clinical Cardiac Electrophysiology
- Accepts Medicare Approved Payment
- PECOS Enrolled
About JUSTIN MAO
This page provides the complete NPI Profile along with additional information for Justin Mao, an internist established in Downers Grove, Illinois with a medical specialization in Internal Medicine, focusing in clinical cardiac electrophysiology and more than 25 years of experience. The healthcare provider is registered in the NPI registry with number 1427052273 assigned on June 2005. The practitioner's primary taxonomy code is 207RC0001X with license number 036-124995 (IL). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1427052273
- Provider Name
- DR. JUSTIN T MAO MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 3825 HIGHLAND AVE FL TOWER24 DOWNERS GROVE, IL 60515
- Location Phone
- (630) 719-4799
- Location Fax
- (630) 963-7420
- Mailing Address
- 29373 NETWORK PL CHICAGO, IL 60673
- Mailing Phone
- (847) 390-5900
- Medical School Name
- OTHER
- Graduation Year
- 2001
- Is Sole Proprietor?
- No
- Enumeration Date
- 06-09-2005
- Last Update Date
- 04-21-2025
- Code Navigator
An internist like Justin Mao 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
- 1340 Charles St Ste 300
Rockford, IL 61104
(815) 490-5888
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 Clinical Cardiac Electrophysiology
- Taxonomy Code
- 207RC0001X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 036-124995
- License State
- IL
- Taxonomy Description
- A field of special interest within the subspecialty of cardiovascular disease, specialty of Internal Medicine, which involves intricate technical procedures to evaluate heart rhythms and determine appropriate treatment for them.
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 | 219331 (MA) |
| 2 | 207R00000X | Allopathic & Osteopathic Physicians | Internal Medicine | 036-124995 (IL) |
| 3 | 207RC0000X | Allopathic & Osteopathic Physicians | Internal Medicine | 036-124995 (IL) |
| 4 | 207RC0000X | Allopathic & Osteopathic Physicians | Internal Medicine | 225456 (MI) |
Medicare Participation & PECOS Enrollment Status
Justin Mao is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.
Justin Mao 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: 42280612
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: I20100922000950
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? Yes
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.
Electrocardiogram (ecg) 2-day continuous with review by health care professional
Electrocardiogram (ecg) up to 30 days continuous with symptom monitoring, transmission and review and report by health care professional
Established patient office or other outpatient visit, 40-54 minutes
Established patient office or other outpatient visit, 40-54 minutes
Evaluation of cardiac rhythm monitor system
Evaluation of cardiac rhythm monitor system, remote up to 30 days
Evaluation of implantable heart and blood vessel monitoring system
Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days
Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days
Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days
External shock to heart to regulate heart beat
Follow-up hospital inpatient care per day, typically 25 minutes
Follow-up hospital inpatient care per day, typically 35 minutes
Initial hospital inpatient care per day, typically 50 minutes
Initial hospital inpatient care per day, typically 70 minutes
Insertion of heart rhythm monitor under skin
Insertion of needle into vein for collection of blood sample
Insertion of pacemaker and upper and lower heart chamber electrode
New patient office or other outpatient visit, 60-74 minutes
Pacemaker insertion or repair
Programming of dual lead implantable defibrillator system
Programming of dual lead pacemaker system
Programming of multiple lead implantable defibrillator system
Programming of multiple lead pacemaker system
Programming of single lead implantable defibrillator system
Programming of single lead pacemaker system
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes
An Electrocardiogram (ECG) is a test that checks your heart's activity. The 2-day continuous ECG records your heart's rhythm non-stop for 48 hours. It helps to detect irregularities that may not occur during a shorter test. A healthcare professional will review the results to identify any issues.
This service was performed 87 times for 84 patientsAn Electrocardiogram (ECG) is a test that records the electrical activity of your heart. For up to 30 days, a device will continuously monitor your heart's rhythm, noting any symptoms. The data is sent to a healthcare professional who reviews it and provides a report on your heart health.
This service was performed 51 times for 51 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 13 times for 12 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 674 times for 477 patientsThe evaluation of a cardiac rhythm monitor system involves checking your heart's electrical activity. It's a non-invasive procedure that uses a device to record your heart's rhythm and rate. This helps identify any irregularities, ensuring your heart is functioning properly.
This service was performed 20 times for 18 patientsThis procedure involves remotely monitoring your heart rhythm for up to 30 days. A small device will record your heart's activity, which can be accessed by your healthcare team. This aids in diagnosing any irregularities or issues with your heart function.
This service was performed 72 times for 44 patientsAn evaluation of an implantable heart and blood vessel monitoring system involves checking the device that's placed inside your body to monitor your heart and blood vessels' health. It helps doctors track your heart rate, rhythm, and blood flow, aiding in prompt, accurate treatment.
This service was performed 25 times for 25 patientsThis procedure involves remotely monitoring your pacemaker or implantable defibrillator system. Over a 90-day period, we check the device's performance and your heart's activity. This helps ensure the device is functioning properly and providing the best possible support for your heart health.
This service was performed 23 times for 21 patientsThis procedure evaluates your pacemaker system remotely for up to 90 days. It checks whether single, dual, multiple lead, or leadless pacemakers are working properly. It's a safe, convenient way to ensure your heart device is functioning optimally.
This service was performed 295 times for 219 patientsThis procedure involves remotely monitoring your implantable defibrillator system, which can have single, dual, or multiple leads. Over a period of up to 90 days, the system's performance is evaluated to ensure it's working properly and providing the necessary heart rhythm support.
This service was performed 151 times for 109 patientsThis procedure, known as cardioversion, uses an external electrical shock to restore your heart's normal rhythm. It's typically performed when irregular heartbeats, or arrhythmias, are causing severe symptoms and aren't responding to medications.
This service was performed 25 times for 22 patientsFollow-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.
This service was performed 63 times for 38 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 131 times for 89 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 41 times for 37 patientsInitial 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.
This service was performed 50 times for 49 patientsThe insertion of a heart rhythm monitor under the skin is a procedure to track your heart's activity. A small device is placed under your skin, recording your heart's rhythms continuously. This helps identify irregular heartbeats or conditions, aiding in your treatment.
This service was performed 14 times for 14 patientsThis procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
This service was performed 29 times for 23 patientsA pacemaker insertion is a procedure where a small device, called a pacemaker, is implanted under your skin. This device uses electrical pulses to prompt the heart to beat at a normal rate. Electrodes are placed in the upper and lower chambers of your heart to help regulate your heartbeat.
This service was performed 19 times for 19 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 40 times for 40 patientsPacemaker insertion or repair is a procedure to help regulate your heartbeat. A small device, called a pacemaker, is implanted under the skin near your heart. This device sends electrical signals to prompt your heart to beat at a normal rate. In a repair procedure, the pacemaker may be adjusted, replaced, or the wires connecting it to your heart may be fixed.
This service was performed for 70 patientsProgramming of a dual lead implantable defibrillator system involves adjusting settings on a device implanted in your chest. This device monitors your heart rhythm and delivers electrical pulses to correct irregular heartbeats, helping maintain a healthy heart rhythm.
This service was performed 23 times for 20 patientsProgramming of a dual lead pacemaker system is a procedure to adjust your heart's pacemaker settings. This process involves a small device, called a programmer, that communicates with your pacemaker to ensure it's working optimally for your heart's needs.
This service was performed 166 times for 131 patientsProgramming of a multiple lead implantable defibrillator system involves adjusting settings on your implanted device to help control irregular heart rhythms. The process is non-invasive and helps ensure optimal device performance for maintaining heart health.
This service was performed 34 times for 23 patientsProgramming of a multiple lead pacemaker system involves adjusting settings on your pacemaker device to optimize its function. This device uses electrical impulses to regulate your heart's rhythm. The procedure ensures it's working effectively for your specific needs.
This service was performed 28 times for 24 patientsProgramming of a single lead implantable defibrillator system involves setting up and adjusting a device implanted in your body. This device helps regulate your heartbeat. It can detect irregular heart rhythms and provide corrective electric shocks to restore a normal heartbeat.
This service was performed 24 times for 19 patientsProgramming of a single lead pacemaker system involves adjusting the pacemaker's settings to suit your heart's unique needs. This is done using a special device that communicates with the pacemaker, ensuring it helps your heart beat at an optimal rate.
This service was performed 27 times for 22 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 334 times for 247 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 27 times for 27 patientsThis procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.
This service was performed 48 times for 45 patientsPhysician Visit Costs
The typical physician office visit costs for Medicare beneficiaries in this area are: $34.35 for a new patient copayment and $26.26 for an established patient copayment.
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 60515 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $137.43
- Minimum New Patient Price $59.81
- Maximum New Patient Price $181.38
- Average New Patient Copayment $34.35
- Minimum New Patient Copayment $14.95
- Maximum New Patient Copayment $45.34
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $105.07
- Minimum Established Patient Price $19.15
- Maximum Established Patient Price $147.12
- Average Established Patient Copayment $26.26
- Minimum Established Patient Copayment $4.78
- Maximum Established Patient Copayment $36.78
* 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.
Find Provider Hospital Affiliations - Privileges
Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.
Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Justin Mao is affiliated with the following medical facilities:
| Hospital Name | Address | Phone | Hospital Type | Overall Rating |
|---|---|---|---|---|
| EDWARD HOSPITAL | 801 SOUTH WASHINGTON NAPERVILLE, IL 60540 | (630) 527-3000 | Acute Care Hospitals | |
| ADVOCATE GOOD SAMARITAN HOSPITAL | 3815 HIGHLAND AVENUE DOWNERS GROVE, IL 60515 | (630) 275-5900 | Acute Care Hospitals |
Reviews for DR. JUSTIN T MAO MD
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1427052273, we treat the final digit (3) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 57. The final step is to find the difference between that total and the next multiple of ten (60 - 57 = 3).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 57 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 7 providers are registered at the same or a nearby location.
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1427052273, enumerated as an "individual" on June 09, 2005.
The provider is located at 3825 HIGHLAND AVE FL TOWER24 DOWNERS GROVE, IL 60515 and the phone number is (630) 719-4799.
Internal Medicine with taxonomy code 207RC0001X and a focus in Clinical Cardiac Electrophysiology.
Justin Mao is affiliated with: EDWARD HOSPITAL and ADVOCATE GOOD SAMARITAN HOSPITAL.