William C. Koonce, MD
Internal Medicine Physician · Santa Barbara, CA
William C. Koonce, MD is an internal medicine physician with a practice address in Santa Barbara, California, and NPI 1124010095, issued on Aug 17, 2005. Check the license (California G58414, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William C. Koonce
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G58414 CA
Self-reported in NPPES; status is on the state search - Practice location
- 219 Nogales Ave, Santa Barbara, CA 93105
- Phone
- (805) 682-7200
- Enumerated
- Aug 17, 2005
- Record last updated
- Sep 9, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (805) 682-3278
- Medicaid ID
- 1124010095 CA
- Medicare enrollment
- Enrolled (PECOS I20100802000858); may accept Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1985
- Entity
- Type 1 · individual
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Verify William C. Koonce in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G58414Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average internal medicine physician in 2024
8,873 Medicare Part D claims for 468 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 230 claims were for opioids.
Most prescribed
- Atorvastatin Calcium512 claims
- Levothyroxine Sodium465 claims
- Losartan Potassium442 claims
- Escitalopram Oxalate253 claims
- Gabapentin251 claims
- Eliquis232 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 92.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,055.01
52 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
William C. Koonce among 17,696 internal medicine physician records in California
William C. Koonce, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1985 · median 2004 among the 11,065 with a school on file
- Record last updated2010 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
129 internal medicine physician records list a practice address in Santa Barbara
They are 129 of the 5,328 NPPES records with a practice address in Santa Barbara, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Barbara → Internal Medicine Physician nationwide →
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- Jeffrey Hadsall, M.D.Santa Barbara, CA 931051275641714
- Sandra Kramer, MDSanta Barbara, CA 931051104823418
- David Mandel, M.D.Santa Barbara, CA 931051902918865
Common questions
What is William C. Koonce, MD's NPI number?
William C. Koonce, MD's National Provider Identifier (NPI) is 1124010095, issued on Aug 17, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William C. Koonce, MD located?
The NPPES record lists a practice address at 219 Nogales Ave, Santa Barbara, CA, 93105. Phone: (805) 682-7200. Providers update this record themselves, so call before visiting.
How can I verify William C. Koonce, MD's license?
NPPES lists California license number G58414, 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 C. Koonce, MD prescribe under Medicare Part D?
In 2024, William C. Koonce, MD had 8,873 Medicare Part D claims for 468 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is William C. Koonce, MD's MIPS final score?
The 2023 MIPS final score is 92.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.