Physician Profile
Unclaimed ProfileAbout 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.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Ong specialize in?
Dr. Ong is a cardiac electrophysiology in Tarzana, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CARDIAC ELECTROPHYSIOLOGY”.
NPI registry
Where is Dr. Ong located?
Dr. 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 Dr. Ong's phone number?
The number on file is (818) 342-5377. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Ong's NPI number?
Dr. 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 Dr. Ong go to medical school?
Dr. 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 Dr. Ong been practicing?
Dr. Ong has 37 years experience. Calculated from a graduation year of 1989, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Ong do most often?
According to Medicare billing data, Dr. 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 Dr. Ong confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Ong. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (818) 342-5377
- Email not available
Practice Locations
18372 CLARK ST SUITE 218
Tarzana, CA 91356
Procedures Most Often Billed to Medicare
8,504 services · 4,486 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Evaluation of cardiac rhythm monitor system, remote up to 30 days | Treatment | 93298 |
1,495 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
1,243 |
| Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days | Treatment | 93296 |
539 |
| Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days | Treatment | 93294 |
380 |
| Evaluation of implantable heart and blood vessel monitoring system, remote up to 30 days | Treatment | 93297 |
317 |
| Heart rhythm review, and interpretation of continous external ekg over more than 48 hours up to 7 days | Treatment | 93244 |
208 |
| Heart rhythm recording continous external ekg over more than 48 hours up to 7 days | Treatment | 93242 |
208 |
| Insertion of catheters and destruction of tissue to treat abnormal heart rhythm | Treatment | 93655 |
191 |
| Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days | Treatment | 93295 |
162 |
| Programming of dual lead pacemaker system | Treatment | 93280 |
141 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated 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.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.