Physician Profile
Unclaimed ProfileAbout JOHN
Roy Mattathu John, MD is a healthcare provider in Stanford, CA specialising in cardiac electrophysiology. Roy is also listed as specialising in internal medicine, cardiovascular disease, and clinical cardiac electrophysiology.
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. John specialise in?
Dr. John is a cardiac electrophysiology in Stanford, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CARDIAC ELECTROPHYSIOLOGY”.
NPI registry
Where is Dr. John located?
Dr. John is listed at 300 PASTEUR DR, Stanford, CA 94305. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. John's phone number?
The number on file is (650) 723-4000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. John's NPI number?
Dr. John's National Provider Identifier is 1417993528. 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. John go to medical school?
Dr. John attended Other, graduating in 1979. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. John been practising?
Dr. John has 47 years experience. Calculated from a graduation year of 1979, reported in the CMS National Downloadable File.
CMS public data
What does Dr. John do most often?
According to Medicare billing data, Dr. John performs procedures including insertion of pacemaker and upper and lower heart chamber electrode; provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only and heart rhythm review and interpretation of continous external ekg over 8-15 days, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. John confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. John. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (650) 723-4000
- Email not available
Practice Locations
300 PASTEUR DR
Stanford, CA 94305
Procedures Most Often Billed to Medicare
1,123 services · 995 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Insertion of pacemaker and upper and lower heart chamber electrode | Procedure | 33208 |
18 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
413 |
| Heart rhythm review and interpretation of continous external ekg over 8-15 days | Treatment | 93248 |
72 |
| Comprehensive electrophysiologic evaluation with catheter destruction of abnormality causing atrial fibrillation (uncoordinated contraction of upper chambers of heart) by pulmonary vein isolation | Treatment | 93656 |
44 |
| Insertion of catheters and destruction of tissue to treat abnormal heart rhythm | Treatment | 93655 |
30 |
| Programming of dual lead pacemaker system | Treatment | 93280 |
29 |
| Destruction of tissue of upper heart chamber through tube to treat abnormal heart rhythm | Treatment | 93657 |
23 |
| Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes | Treatment | 99152 |
18 |
| Programming of multiple lead implantable defibrillator system | Treatment | 93284 |
17 |
| Ultrasound evaluation of heart blood vessel with review by radiologist | Treatment | 93662 |
16 |
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.
Other cardiac electrophysiology specialists in Stanford 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1979 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of pacemaker and upper and lower heart chamber electrode 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.