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Edit this profileAt a glance
- 18372 Clark St, Suite 218, Tarzana, CA 91356
About Dr. Ong
James J. Ong, M.D. practices cardiac electrophysiology in Tarzana, CA. James is a 1989 graduate of University of California, San Diego School of Medicine. James is also listed as specializing in specialist. According to Medicare claims data, James cared for 4,486 Medicare patients across 8,504 services. The services billed most often include evaluation of cardiac rhythm monitor system, remote up to 30 days, routine electrocardiogram (ecg) using at least 12 leads with interpretation and report, and established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more. The provider's National Provider Identifier (NPI) is 1912955980.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (818) 342-5377
- Email not available
Practice Locations
18372 CLARK ST SUITE 218
Tarzana, CA 91356
Conditions Commonly Evaluated or Treated
Within Clinical Cardiac Electrophysiology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- AFib
- Arrhythmias
- Coronary artery disease
- Heart attack
Abnormal heart rhythms
- Atrial Tachycardia
- Premature atrial contractions
Autonomic disorders
- Orthostatic hypotension
- Postural orthostatic tachycardia syndrome
Conduction disorders
- Bundle Branch Block
- Heart block
- Junctional Rhythm
- Tachy-Brady Syndrome
Dangerous heart rhythms
- Cardiac Arrest
- Ventricular Fibrillation
- Ventricular tachycardia
Device complications
- Pacemaker Infection
Device issues
- Frequent Defibrillator Shocks
- Pacemaker Syndrome
Fainting & reflex disorders
- Carotid Sinus Hypersensitivity
Genetic heart conditions
- Arrhythmogenic Right Ventricular Dysplasia
- Brugada Syndrome
- Catecholaminergic Polymorphic Ventricular Tachycardia
- Long QT syndrome
Heart failure and muscle
- Weak Heart Muscle
Heart muscle conditions
- Cardiac Sarcoidosis
- Hypertrophic cardiomyopathy
Heart rhythm disorders
- Inappropriate Sinus Tachycardia
- Supraventricular tachycardia
- Wolff-Parkinson-White Syndrome
Inherited rhythm disorders
- Short QT Syndrome
Structural heart conditions
- Arrhythmic Mitral Valve Prolapse
Symptoms
- Dizziness and Lightheadedness
- Fainting and syncope
- Heart palpitations
- Premature ventricular contractions
- Slow heart rate (bradycardia)
Procedures & services
Most searched procedures
- AFib ablation
- Angioplasty and stenting
- Cardiac catheterization
- Pacemaker implantation
- Watchman procedure
Advanced therapies
- Stereotactic Cardiac Radioablation (STAR)
Catheter ablation
- AV Node Ablation
- Cardioneuroablation
- Cryoablation
- Epicardial Catheter Ablation
- Heart Flutter Ablation
- Pulsed Field Ablation
- PVC Ablation
- Ventricular Tachycardia Ablation
Device care
- Pacemaker Check
- Remote Device Monitoring
Device management
- Pacemaker or Defibrillator Reprogramming
Device placement
- Extravascular Defibrillator Placement (EV-ICD)
Device procedures
- Cardiac resynchronization therapy device placement
- Conduction System Pacing
- Implantable cardioverter-defibrillator placement
- Leadless Pacemaker Placement
- Pacemaker Battery Replacement
- Pacemaker Lead Removal
- Subcutaneous Defibrillator Placement
Diagnostic imaging
- Cardiac MRI for Heart Scarring
- Transesophageal echocardiogram
Diagnostic monitoring
- 24-Hour Holter Monitor
- Exercise Stress Test for Arrhythmia
Diagnostic testing
- Brugada Drug Challenge Test
- Carotid Sinus Massage
Diagnostic tests
- 30-Day Cardiac Event Monitor
- Electrophysiology study
- Genetic Arrhythmia Testing
- Heart monitor
- Implantable Loop Recorder (Cardiac Monitor Implant)
- Tilt Table Test
- Wearable Heart Patch Monitor
External devices
- LifeVest Fitting
Heart rhythm treatments
- AED Shock or Defibrillation
Medication management
- Heart Rhythm Medication Management
Minor device procedures
- Loop Recorder Removal
Rhythm restoration
- Electrical cardioversion
Stroke prevention
- Left atrial appendage closure
Procedures Most Often Billed to Medicare
8,504 services · 4,486 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Evaluation of cardiac rhythm monitor system, remote up to 30 days | Treatment | 93298 |
1,495 | More than most peers in Cardiac Electrophysiology |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
1,243 | More than most peers in Cardiac Electrophysiology |
| Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days | Treatment | 93296 |
539 | More than most peers in Cardiac Electrophysiology |
| Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days | Treatment | 93294 |
380 | More than most peers in Cardiac Electrophysiology |
| Evaluation of implantable heart and blood vessel monitoring system, remote up to 30 days | Treatment | 93297 |
317 | More often than most peers in Cardiac Electrophysiology |
| Heart rhythm review, and interpretation of continous external ekg over more than 48 hours up to 7 days | Treatment | 93244 |
208 | More than most peers in Cardiac Electrophysiology |
| Heart rhythm recording continous external ekg over more than 48 hours up to 7 days | Treatment | 93242 |
208 | More than most peers in Cardiac Electrophysiology |
| Insertion of catheters and destruction of tissue to treat abnormal heart rhythm | Treatment | 93655 |
191 | Too few peers to compare |
| Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days | Treatment | 93295 |
162 | More often than most peers in Cardiac Electrophysiology |
| Programming of dual lead pacemaker system | Treatment | 93280 |
141 | More than most peers in Cardiac Electrophysiology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at University of California, San Diego School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1989 at University of California, San Diego School of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Evaluation of cardiac rhythm monitor system, remote up to 30 days 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does James J. Ong specialize in?
James J. Ong is a cardiac electrophysiology in Tarzana, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is James J. Ong located?
James J. Ong is listed at 18372 Clark St Suite 218, Tarzana, CA 91356. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is James J. Ong's phone number?
The number on file is (818) 342-5377. Contact the office directly to confirm availability and scheduling.
NPI registry
What is James J. Ong's NPI number?
James J. Ong's National Provider Identifier is 1912955980. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did James J. Ong train?
James J. Ong attended University of California, San Diego School of Medicine, graduating in 1989. This comes from the CMS National Downloadable File.
CMS public data
How long has James J. Ong been practicing?
James J. Ong has 37 years experience. Calculated from a graduation year of 1989, reported in the CMS National Downloadable File.
CMS public data
What does James J. Ong do most often?
According to Medicare billing data, James J. Ong provides treatments such as evaluation of cardiac rhythm monitor system, remote up to 30 days and routine electrocardiogram using at least 12 leads with interpretation and report, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has James J. Ong confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by James J. Ong. If this is you, claiming it is free.
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