William Mac Young, M.D.
Psychiatry Physician · Fountain Valley, CA
William Mac Young, M.D. is a psychiatry physician with a practice address in Fountain Valley, California, and NPI 1073537098, issued on Jul 26, 2006. Check the license (California C27892, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Mac Young
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- C27892 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11770 Warner Ave, Fountain Valley, CA 92708
- Phone
- (714) 241-8560
- Enumerated
- Jul 26, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (714) 241-8576
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 11770 Warner Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Julie Kramer, MSMFTMarriage & Family Therapist1881908952
- Lynn Miller, LCSWClinical Social Worker1699873679
Verify William Mac Young in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C27892Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average psychiatry physician in 2024
343 Medicare Part D claims for 24 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Desvenlafaxine Succinate Er40 claims
- Clonazepam39 claims
- Quetiapine Fumarate33 claims
- Alprazolam25 claims
- Paroxetine Hcl25 claims
- Lamotrigine14 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 Mac Young among 8,673 psychiatry physician records in California
William Mac Young, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in California
There are 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Fountain Valley → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Samuel Albert, M.D.Fountain Valley, CA 927081649560137
- Gina Ferrara, MDFountain Valley, CA 927081164638201
- Diane Harris, MDFountain Valley, CA 927081225041023
- Renuka Patel, M.D.Fountain Valley, CA 927081104817147
- Craig Ross, M.D.Fountain Valley, CA 927081215928221
- Alexander TruongFountain Valley, CA 927081457918559
- Vijay Chandran, MD,RN,MBA.;Santa Ana, CA 927071801283692
- Sharon ChenSanta Ana, CA 927071417410713
Common questions
What is William Mac Young, M.D.'s NPI number?
William Mac Young, M.D.'s National Provider Identifier (NPI) is 1073537098, issued on Jul 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Mac Young, M.D. located?
The NPPES record lists a practice address at 11770 Warner Ave, Fountain Valley, CA, 92708. Phone: (714) 241-8560. Providers update this record themselves, so call before visiting.
How can I verify William Mac Young, M.D.'s license?
NPPES lists California license number C27892, 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 Mac Young, M.D. prescribe under Medicare Part D?
In 2024, William Mac Young, M.D. had 343 Medicare Part D claims for 24 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.