Matthew Walt Gerenz, MD
Psychiatry Physician · Orange, CA
Matthew Walt Gerenz, MD is a psychiatry physician with a practice address in Orange, California, and NPI 1992385785, issued on Apr 14, 2021. Check the license (California A183126, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Matthew Walt Gerenz
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A183126 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3800 W Chapman Ave, Orange, CA 92868
- Phone
- (701) 400-2926
- Enumerated
- Apr 14, 2021
- Record last updated
- Apr 25, 2024
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 3800 W Chapman Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kyoungbin Im, M.D.Psychiatry Physician1316156193
- Mary Londono, MDStudent in an Organized Health Care Education/Training Program1023861325
Verify Matthew Walt Gerenz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A183126Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average psychiatry physician in 2024
590 Medicare Part D claims for 56 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Escitalopram Oxalate46 claims
- Trazodone Hcl37 claims
- Clonazepam30 claims
- Quetiapine Fumarate27 claims
- Lorazepam26 claims
- Aripiprazole25 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.
Matthew Walt Gerenz among 8,673 psychiatry physician records in California
Matthew Walt Gerenz, MD 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 2021, is newer than 91% of them.
- NPI issued2021 · 91% of these records are older, 7% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2024 · 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).
116 psychiatry physician records list a practice address in Orange
They are 116 of the 13,245 NPPES records with a practice address in Orange, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Orange → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Daniel Chueh, M.D.Orange, CA 928681174589642
- K De Silva, MDOrange, CA 928681992730170
- Constance De Silva, MDOrange, CA 928681912922634
- Lianjie Du, M.D.Orange, CA 928681255331385
- Gaurav Gandotra, MDOrange, CA 928681386617421
- Carla Hammond, M.D.Orange, CA 928681407889355
- Alan Hanft, M.D.Orange, CA 928681376599076
- Joshua Israel, MDOrange, CA 928681689628265
Common questions
What is Matthew Walt Gerenz, MD's NPI number?
Matthew Walt Gerenz, MD's National Provider Identifier (NPI) is 1992385785, issued on Apr 14, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Walt Gerenz, MD located?
The NPPES record lists a practice address at 3800 W Chapman Ave, Orange, CA, 92868. Phone: (701) 400-2926. Providers update this record themselves, so call before visiting.
How can I verify Matthew Walt Gerenz, MD's license?
NPPES lists California license number A183126, 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 Matthew Walt Gerenz, MD prescribe under Medicare Part D?
In 2024, Matthew Walt Gerenz, MD had 590 Medicare Part D claims for 56 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.