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Edit this profileWhere to find John O. Clarke, M.D.
- Palo Alto location main office
300 Pasteur Dr, Palo Alto, CA 94304 - Baltimore location
600 N Wolfe St, Baltimore, MD 21287
About Dr. Clarke
John O. Clarke, M.D. practices gastroenterology in Palo Alto, CA. John is a 1999 graduate of University of Missouri, Columbia School of Medicine. John is also listed as specializing in internal medicine. Medicare claims data shows John provided 1,309 services to 1,151 patients. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, measurement of hydrogen in breath to test for stomach and bowel symptoms, and biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope. The provider's National Provider Identifier (NPI) is 1467539643.
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
- (650) 723-4000
- Email not available
Practice Locations
300 PASTEUR DR
Palo Alto, CA 94304
600 N Wolfe St
Baltimore, MD 21287
Conditions Commonly Evaluated or Treated
Within Gastroenterology 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
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
Lower endoscopy
Upper endoscopy
Capsule and physiology testing
Diagnostic Testing
Liver procedures
Treatments
Procedures Most Often Billed to Medicare
1,309 services · 1,151 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
95 | More than most peers in Gastroenterology |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
89 | More than most peers in Gastroenterology |
| Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | Procedure | 43249 |
39 | More often than most peers in Gastroenterology |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
27 | Less often than most peers in Gastroenterology |
| Insertion of tube or tube in esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43241 |
24 | Too few peers to compare |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
22 | As often as other peers in Gastroenterology |
| Injection of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43236 |
21 | More often than most peers in Gastroenterology |
| Insertion of tube or tube in esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43241 |
19 | Too few peers to compare |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
17 | Less often than most peers in Gastroenterology |
| Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | Procedure | 43249 |
17 | More often than most peers in Gastroenterology |
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.
Related specialists at this location 3
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 gastroenterologists 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.
Common questions
What is John O. Clarke's specialty?
John O. Clarke is a gastroenterologist in Palo Alto, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where can I find John O. Clarke?
John O. 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 John O. Clarke?
The number on file is (650) 723-4000. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for John O. Clarke?
John O. 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 John O. Clarke's education?
John O. 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 John O. Clarke have?
John O. Clarke has 27 years experience. Calculated from a graduation year of 1999, reported in the CMS National Downloadable File.
CMS public data
What is John O. Clarke known for?
According to Medicare billing data, John O. 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 John O. Clarke's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by John O. Clarke. If this is you, claiming it is free.
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