Ann O. Massion, M.D.
Psychiatry Physician · Del Mar, CA
Ann O. Massion, M.D. is a psychiatry physician with a practice address in Del Mar, California, and NPI 1376517664, issued on Feb 14, 2006. Check the license (California A49598, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ann O. Massion
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A49598 CA
Self-reported in NPPES; status is on the state search - Practice location
- 12835 Pointe Del Mar Way, Del Mar, CA 92014
- Phone
- (858) 259-0599
- Enumerated
- Feb 14, 2006
- Record last updated
- Oct 15, 2015 (not updated in 11 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 12835 Pointe Del Mar Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joyce Prince, LMFTMarriage & Family Therapist1891144655
- Joseph Wurbel, DOPsychiatry Physician1700235918
Verify Ann O. Massion in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A49598Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average psychiatry physician in 2024
94 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Mirtazapine16 claims
- Escitalopram Oxalate15 claims
- Clonazepam14 claims
- Dextroamphetamine-Amphetamine11 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.
Ann O. Massion among 8,673 psychiatry physician records in California
Ann O. Massion, 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 updated2015 · 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).
19 psychiatry physician records list a practice address in Del Mar
They are 19 of the 344 NPPES records with a practice address in Del Mar, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Del Mar → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Edward Allen, M.D.Del Mar, CA 920141881781334
- David Bergman, M.D.Del Mar, CA 920141285737130
- Rustin Berlow, MDDel Mar, CA 920141164549077
- Scott Cologne, M.D.Del Mar, CA 920141215055421
- Kim Gutner, M.D.Del Mar, CA 920141740360924
- Jeffrey Hollingsworth, D.O.Del Mar, CA 920141376748673
- Elizabeth Hudler, MDDel Mar, CA 920141134287352
- Carolyn Josepho, MDDel Mar, CA 920141932274891
Common questions
What is Ann O. Massion, M.D.'s NPI number?
Ann O. Massion, M.D.'s National Provider Identifier (NPI) is 1376517664, issued on Feb 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ann O. Massion, M.D. located?
The NPPES record lists a practice address at 12835 Pointe Del Mar Way, Del Mar, CA, 92014. Phone: (858) 259-0599. Providers update this record themselves, so call before visiting.
How can I verify Ann O. Massion, M.D.'s license?
NPPES lists California license number A49598, 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 Ann O. Massion, M.D. prescribe under Medicare Part D?
In 2024, Ann O. Massion, M.D. had 94 Medicare Part D claims; 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.