William V. Hahn, M.D.
Gastroenterology Physician · Santa Barbara, CA
William V. Hahn, M.D. is a gastroenterology physician with a practice address in Santa Barbara, California, and NPI 1033227582, issued on Aug 25, 2006. Check the license (California G24182, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William V. Hahn
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G24182 CA
Self-reported in NPPES; status is on the state search - Practice location
- 317 W Pueblo St, Santa Barbara, CA 93105
- Phone
- (805) 681-1761
- Enumerated
- Aug 25, 2006
- Record last updated
- May 21, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (805) 681-1768
- Medicaid ID
- 00G241820 CA
- Medicare enrollment
- Enrolled (PECOS I20101013000838); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1971
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 317 W Pueblo St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William V. Hahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G24182Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,888 Medicare Part D claims for 769 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. 90 claims were for opioids.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf268 claims
- Omeprazole261 claims
- Famotidine165 claims
- Pantoprazole Sodium119 claims
- Peg 3350-Electrolyte93 claims
- Hydrocodone-Acetaminophen82 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $318.88
19 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sansum ClinicSanta Barbara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William V. Hahn among 2,140 gastroenterology physician records in California
William V. Hahn, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1971 · median 2002 among the 1,538 with a school on file
- Record last updated2008 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Santa Barbara → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Thomas Aguirre, M.D.Santa Barbara, CA 931051285772004
- Edward Bentley, M.D.Santa Barbara, CA 931051285784207
- Thomas Caves, M.D.Santa Barbara, CA 931051144284522
- Vincent Derosa, M.D.Santa Barbara, CA 931051679754956
- James Egan, M.D.Santa Barbara, CA 931051346357696
- John Hobson, M.D.Santa Barbara, CA 931051447368535
- Brent Kovacs, MDSanta Barbara, CA 931051730296542
- Stephen Lemon, M.D.Santa Barbara, CA 931051518007590
Common questions
What is William V. Hahn, M.D.'s NPI number?
William V. Hahn, M.D.'s National Provider Identifier (NPI) is 1033227582, issued on Aug 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William V. Hahn, M.D. located?
The NPPES record lists a practice address at 317 W Pueblo St, Santa Barbara, CA, 93105. Phone: (805) 681-1761. Providers update this record themselves, so call before visiting.
How can I verify William V. Hahn, M.D.'s license?
NPPES lists California license number G24182, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William V. Hahn, M.D. prescribe under Medicare Part D?
In 2024, William V. Hahn, M.D. had 1,888 Medicare Part D claims for 769 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.