Arnold Knepfer, M.D.
Psychiatry Physician · Corte Madera, CA
Arnold Knepfer, M.D. is a psychiatry physician with a practice address in Corte Madera, California, and NPI 1134117435, issued on Oct 11, 2005. Check the license (California G5489, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Arnold Knepfer
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G5489 CA
Self-reported in NPPES; status is on the state search - Practice location
- 21 Tamal Vista Blvd, Corte Madera, CA 94925
- Phone
- (415) 927-2320
- Enumerated
- Oct 11, 2005
- Record last updated
- Feb 15, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (415) 927-1225
- Medicaid ID
- 000G54890 CA
- Medicare enrollment
- Enrolled (PECOS I20120308000075); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 21 Tamal Vista Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Arnold Knepfer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G5489Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average psychiatry physician in 2024
599 Medicare Part D claims for 39 beneficiaries, 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
- Alprazolam56 claims
- Quetiapine Fumarate43 claims
- Zolpidem Tartrate40 claims
- Lorazepam34 claims
- Citalopram Hbr33 claims
- Escitalopram Oxalate28 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.
Arnold Knepfer among 8,673 psychiatry physician records in California
Arnold Knepfer, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 98% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated1958 · median 2005 among the 3,295 with a school on file
- Record last updated2011 · 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).
16 psychiatry physician records list a practice address in Corte Madera
They are 16 of the 365 NPPES records with a practice address in Corte Madera, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Corte Madera → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Scott Barshack, M.D.Corte Madera, CA 949251962502948
- Omri Berger, M.D.Corte Madera, CA 949251639351687
- Madison Buchanan, MDCorte Madera, CA 949251679993083
- Charles Fleckles, MDCorte Madera, CA 949251396753232
- Nazineh Huff, MDCorte Madera, CA 949251255522264
- Patricia Jones, MDCorte Madera, CA 949251750405577
- Judith Keins, M.D.Corte Madera, CA 949251083821912
- Donald Nevins, M.D.Corte Madera, CA 949251275880882
Common questions
What is Arnold Knepfer, M.D.'s NPI number?
Arnold Knepfer, M.D.'s National Provider Identifier (NPI) is 1134117435, issued on Oct 11, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Arnold Knepfer, M.D. located?
The NPPES record lists a practice address at 21 Tamal Vista Blvd, Corte Madera, CA, 94925. Phone: (415) 927-2320. Providers update this record themselves, so call before visiting.
How can I verify Arnold Knepfer, M.D.'s license?
NPPES lists California license number G5489, 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 Arnold Knepfer, M.D. prescribe under Medicare Part D?
In 2024, Arnold Knepfer, M.D. had 599 Medicare Part D claims for 39 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.