Dr. William C. Koonce, MD
- Medicare services, 2024
- 4,887
- Medicare patients, 2024
- 571
- Part D claims, 2024
- 8,873
- MIPS score, 2024
- 94
- Hospital affiliations
- 3
- Practice address
- 300 Hot Springs Road, Santa Barbara, CA 93108
- Practice phone
- Call (805) 969-8051
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Casa Dorinda
Skilled Nursing Facility - Part of a CCRC · Santa Barbara, California
Find Dr. Koonce's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William C. Koonce is an internist in Santa Barbara, California
Dr. Koonce practices at Casa Dorinda in Santa Barbara, California.
Dr. Koonce's NPI, 1124010095, was assigned on August 17, 2005. Dr. Koonce graduated from UC Irvine School of Medicine in 1985. Dr. Koonce holds California license G58414.
- NPI
- 1124010095NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1658404371
- NPI enumeration date
- August 17, 2005
- NPI status
- Active
- Practice phone
- (805) 969-8051
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William C. Koonce practices at Casa Dorinda in Santa Barbara, California
Dr. Koonce's primary practice is Casa Dorinda, at 300 Hot Springs Road, Santa Barbara, CA 93108 in Santa Barbara County. The practice phone is (805) 969-8051.
- Casa Dorinda300 Hot Springs Road, Santa Barbara, CA 93108 · Santa Barbara CountyPhone(805) 969-8051
Source: Dmand AI Affiliation Data
Dr. William C. Koonce is affiliated with 12 sites of care and 1 medical group
Dr. Koonce's primary practice is Casa Dorinda in Santa Barbara, California. Dr. Koonce is also affiliated with Santa Barbara Cottage Hospital. Dmand AI also links Dr. Koonce to 2 more hospitals, 3 home health agencies, 1 physician office, 1 group practice or clinic, 1 hospice, 1 senior living community, 1 skilled nursing facility and 1 medical group, each named with a free account. Dr. Koonce's employer is on file too: a skilled nursing facility.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William C. Koonce's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Koonce practices, 12 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Casa Dorinda | Available with a free account |
| +11 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William C. Koonce is one of 16,751 internists in California
Internal medicine is Dr. Koonce's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Koonce is board certified in internal medicine by the American Board of Internal Medicine. Dr. Koonce is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute gastroduodenitis, acute skin infection, aneurysm, arthritis, asthma, atherosclerosis and atrial fibrillation and flutter among the conditions Dr. Koonce treats.
Internists near Dr. Koonce
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William C. Koonce billed Medicare for 4,887 services in 2024
CMS data shows 4,887 Medicare services from Dr. Koonce across 28 procedure codes in 2024, for 571 Medicare patients. Medicare paid $361,703 for them.
Dr. Koonce's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2,2272024: 3,65864%
- Tests and treatments
- 2023: 1202024: 445271%
- Surgery
- 2023: 2102024: 440110%
- Other services
- 2023: 1752024: 22830%
- Drugs given in the office
- 2023: 352024: 5866%
- Lab and pathology
- 2023: 02024: 58
Where Dr. Koonce's Medicare services took place, 2024
- In an office4,02682%
- In a facility86118%
Dr. Koonce compared with the California median for internists, 2024
- Dr. Koonce
- California median
- Medicare services
- 4,887vs 36113.5 times
- Medicare patients
- 571vs 1513.8 times
- Part D claims
- 8,095vs 42119.2 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Koonce's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Koonce and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William C. Koonce treated 571 Medicare patients in 2024, average age 82
CMS counts 571 Medicare patients who saw Dr. Koonce in 2024. The largest group is 75 to 84, with 240 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 2% are also on Medicaid. Their average risk score is 1.34, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Koonce's median patient age at 81, with 51% women.
Dr. Koonce's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Koonce's Medicare patients by sex, 2024
- Women31555%
- Men25645%
Chronic conditions among Dr. Koonce's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis61%
- Diabetes47%
- Chronic kidney disease31%
- Ischemic heart disease31%
- Mood disorders27%
- Atrial fibrillation26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Koonce's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 81
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William C. Koonce wrote 8,873 Medicare Part D claims in 2024
In 2024, Dr. Koonce wrote 8,873 Medicare Part D claims for 468 patients. 84% of them were for generic drugs. CMS names the drug for 8,095 of them, across 145 drugs with 11 or more claims each, at $808,033 in total drug cost. In 2023, CMS named 8,062 claims across 160 drugs.
Dr. Koonce's Part D claims by kind of drug, 2024
- Generic7,443 claims84%
- Brand-name1,412 claims16%
- Other18 claims0%
Dr. Koonce's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Koonce's Part D claims, 2024
- Opioids3%230 of 8,873 claims
- Antibiotics3%295 of 8,873 claims
- Antipsychotics, patients 65 and over1%122 of 8,873 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8,0622024: 8,095No change
Drugs named by CMS: 145 in 2024, 160 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William C. Koonce scored 94 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 94 out of 100 for Dr. Koonce for performance year 2024, reported individually. CMS counts 27 procedures of removal of skin lesions by Dr. Koonce, more than 68% of the clinicians it reports for that procedure.
Dr. Koonce's MIPS scores, performance year 2024
- 94of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
- 80of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Koonce ranks in Medicare procedure volume
- Removal of skin lesions
- 68th percentile27 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. William C. Koonce received $10,162 in industry payments from 2016 to 2025
CMS Open Payments shows 552 general payments to Dr. Koonce from 40 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Amgen Inc. paid the most, $2,288.
General payments to Dr. Koonce by program year, 2016 to 2025
General payments to Dr. Koonce by kind, 2016 to 2025
- Food and beverage$10,09199%
- Education$711%
Companies that paid Dr. Koonce the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William C. Koonce has 1 award and honors on record
Dmand AI lists 1 award for Dr. Koonce, most recently CMS Stage 1 EHR in 2012.
Awards and honors for Dr. Koonce
- 2012
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. William C. Koonce graduated from UC Irvine School of Medicine
Dr. Koonce graduated from UC Irvine School of Medicine in 1985.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. William C. Koonce accepts plans from 8 insurance carriers
Dr. Koonce is in network with 8 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Regence Health Plans
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
Plan types Dr. Koonce accepts, by number of carriers
- Medicare7
- PPO6
- HMO4
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. William C. Koonce's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William C. Koonce
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William C. Koonce's NPI number?
Dr. William C. Koonce's NPI number is 1124010095. It was assigned on August 17, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. William C. Koonce?
Dr. William C. Koonce is an internist in Santa Barbara, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William C. Koonce practice?
Dr. Koonce practices at 300 Hot Springs Road, Santa Barbara, CA 93108. Dr. Koonce's primary practice is Casa Dorinda in Santa Barbara, California. Dmand AI also links Dr. Koonce to 2 hospitals, 3 home health agencies, 1 physician office, 1 group practice or clinic, 1 hospice, 1 senior living community, 1 skilled nursing facility and 1 medical group.
What is Dr. William C. Koonce's office phone number?
The practice phone on file for Dr. Koonce is (805) 969-8051.
What is Dr. William C. Koonce's medical license number?
Dr. Koonce holds California license G58414.
Which hospitals is Dr. William C. Koonce affiliated with?
Dr. Koonce is affiliated with Santa Barbara Cottage Hospital. Dmand AI links Dr. Koonce to 2 more hospitals.
Does Dr. William C. Koonce accept Medicare?
Yes. CMS data shows Dr. Koonce billed Medicare for 4,887 services in 2024.
What is Dr. William C. Koonce's MIPS score?
Dr. Koonce's MIPS final score for performance year 2024 is 94 out of 100, reported individually.
How many Medicare patients does Dr. William C. Koonce see?
CMS counts 571 Medicare patients who saw Dr. Koonce in 2024, with an average age of 82.
Is Dr. William C. Koonce board certified?
Yes. Dr. Koonce is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. William C. Koonce bill to Medicare?
In 2024, Dr. Koonce's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99212) and hospital inpatient care (99233).
Where did Dr. William C. Koonce go to medical school?
Dr. Koonce graduated from UC Irvine School of Medicine in 1985.
What drugs does Dr. William C. Koonce prescribe most?
In 2024 Medicare Part D data, Dr. Koonce's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Losartan Potassium.
Has Dr. William C. Koonce received payments from drug or device companies?
CMS Open Payments shows $10,162 in general payments to Dr. Koonce from 40 companies from 2016 to 2025. The largest total came from Amgen Inc.
How long has Dr. William C. Koonce been practicing?
Dr. Koonce graduated from medical school in 1985, 41 years ago.
What insurance does Dr. William C. Koonce accept?
Dr. Koonce is in network with 8 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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