Physician Profile
Unclaimed ProfileAbout HAHN
William V Hahn, M.D. practices gastroenterology in Santa Barbara, CA. William is a 1971 graduate of University of Washington School of Medicine. According to Medicare claims data, William cared for 1,434 Medicare patients across 1,494 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
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (805) 681-1761
- Email not available
Practice Locations
317 W PUEBLO ST
Santa Barbara, CA 93105
Procedures Most Often Billed to Medicare
1,494 services · 1,434 patients · 16 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
228 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
164 |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
40 |
| Diagnostic exam of large bowel using a flexible endoscope | Procedure | 45378 |
28 |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
23 |
| Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm | Procedure | 43249 |
19 |
| Biopsy of lower large bowel using a flexible endoscope | Procedure | 45331 |
12 |
| Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monit | Billing code | G0500 |
560 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
101 |
| Colorectal cancer screening; colonoscopy on individual at high risk | Billing code | G0105 |
98 |
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.
Other gastroenterology specialists at this location 4
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
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.
More connections — 28 related providers in 4 groups
Other gastroenterology specialists in Santa Barbara 4
Same specialty, same city.
Trained at University of Washington School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1971 at University of Washington School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of polyps or growths of large bowel using an endoscope with mechanical snare 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Dr. Hahn's specialty?
Dr. Hahn is a gastroenterology in Santa Barbara, 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. Hahn?
Dr. Hahn is listed at 317 W PUEBLO ST, Santa Barbara, CA 93105. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Hahn?
The number on file is (805) 681-1761. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Hahn's NPI number?
Dr. Hahn's National Provider Identifier is 1033227582. 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. Hahn's medical education?
Dr. Hahn attended University of Washington School of Medicine, graduating in 1971. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Hahn been practicing?
Dr. Hahn has 55 years experience. Calculated from a graduation year of 1971, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Hahn known for?
According to Medicare billing data, Dr. Hahn performs procedures including removal of polyps or growths of large bowel using an endoscope with mechanical snare, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope and biopsy of large bowel using a flexible endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Hahn confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Hahn. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.