Physician Profile
Unclaimed ProfileAbout CLARKE
John O'Brien Clarke, M.D. practises gastroenterology in Palo Alto, CA. John is a 1999 graduate of University of Missouri, Columbia School of Medicine. John is also listed as specialising in internal medicine. Medicare claims data shows John provided 1,309 services to 1,151 patients.
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 is Dr. Clarke's specialty?
Dr. Clarke is a gastroenterology in Palo Alto, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “GASTROENTEROLOGY”.
NPI registry
Where can I find Dr. Clarke?
Dr. Clarke is listed at 300 PASTEUR DR, Palo Alto, CA 94304. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Clarke?
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 the NPI for Dr. Clarke?
Dr. Clarke's National Provider Identifier is 1467539643. 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
What is Dr. Clarke's medical education?
Dr. Clarke attended University of Missouri, Columbia School of Medicine, graduating in 1999. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Clarke have?
Dr. Clarke has 27 years experience. Calculated from a graduation year of 1999, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Clarke known for?
According to Medicare billing data, Dr. Clarke performs procedures including biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope, balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm and biopsy of large bowel using a flexible endoscope; provides treatments such as measurement of hydrogen in breath to test for stomach and bowel symptoms and study of esophagus to assess movement, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Clarke's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Clarke. 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
Palo Alto, CA 94304
Procedures Most Often Billed to Medicare
1,309 services · 1,151 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
95 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
89 |
| Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | Procedure | 43249 |
39 |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
27 |
| Insertion of tube or tube in esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43241 |
24 |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
22 |
| Injection of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43236 |
21 |
| Insertion of tube or tube in esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43241 |
19 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
17 |
| Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | Procedure | 43249 |
17 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 4
Clinically related specialties at the same address — the people this provider most likely works alongside.
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 gastroenterology specialists in Palo Alto 8
Same specialty, same city.
More connections — 23 related providers in 3 groups
Trained at University of Missouri, Columbia School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1999 at University of Missouri, Columbia School of Medicine 7
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 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.