William Harmon
Addiction Psychiatry Physician · Santa Cruz, CA
William Harmon is an addiction psychiatry physician with a practice address in Santa Cruz, California, and NPI 1194883314, issued on Dec 4, 2006. Check the license (California A23325, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Harmon
- Primary taxonomy
- Addiction Psychiatry Physician 2084P0802X
- License number
- A23325 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3120 Mission Dr, Santa Cruz, CA 95065
- Phone
- (831) 462-0164
- Enumerated
- Dec 4, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest addiction psychiatry physician records → All 73 in California → Look up another NPI →
Verify William Harmon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A23325Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% fewer Medicare Part D claims than the average addiction psychiatry physician in 2024
642 Medicare Part D claims for 56 beneficiaries, against an average of 716 among the 421 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims.
Most prescribed
- Lorazepam82 claims
- Fluoxetine Hcl46 claims
- Alprazolam40 claims
- Quetiapine Fumarate32 claims
- Lamotrigine25 claims
- Sertraline Hcl24 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.
William Harmon among 73 addiction psychiatry physician records in California
William Harmon is one of 73 addiction psychiatry physician records with a practice address in California. 73% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 58% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 34% of these records are
- Record last updated2007 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0802X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Addiction Psychiatry Physician providers in California
There are 73 addiction psychiatry physician records in California.
All 73 in California → Every provider in Santa Cruz → Addiction Psychiatry Physician nationwide →
The 8 addiction psychiatry physician records with the nearest ZIP codes
- Chinenye Okukpon, M.DSanta Clara, CA 950511134654775
- Daniel Saal, MDSanta Clara, CA 950511730267279
- Dale Dallas, MDFelton, CA 950181134207210
- David Granovetter, MDSan Jose, CA 951191619053121
- Timmen Cermak, M.D.Mill Valley, CA 949411235341330
- Nagamani Padala, MDStockton, CA 952021659303253
- Daniel Notzon, M.D.San Rafael, CA 949031992949457
- William Mains, M.D.Oakland, CA 946051477751741
Common questions
What is William Harmon's NPI number?
William Harmon's National Provider Identifier (NPI) is 1194883314, issued on Dec 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Harmon located?
The NPPES record lists a practice address at 3120 Mission Dr, Santa Cruz, CA, 95065. Phone: (831) 462-0164. Providers update this record themselves, so call before visiting.
How can I verify William Harmon's license?
NPPES lists California license number A23325, 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 Harmon prescribe under Medicare Part D?
In 2024, William Harmon had 642 Medicare Part D claims for 56 beneficiaries; the average among addiction psychiatry physician prescribers was 716. 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.