Peter John Cotsirilos, M.D.
Psychiatry Physician · Red Bluff, CA
Peter John Cotsirilos, M.D. is a psychiatry physician with a practice address in Red Bluff, California, and NPI 1235378621, issued on Feb 10, 2009. Check the license (California G66322, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Peter John Cotsirilos
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G66322 CA
Self-reported in NPPES; status is on the state search - Practice location
- 925 Walnut St, Red Bluff, CA 96080
- Phone
- (530) 567-7300
- Enumerated
- Feb 10, 2009
- Record last updated
- Sep 12, 2022
- Medicare enrollment
- Enrolled (PECOS I20090710000353); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Verify Peter John Cotsirilos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G66322Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average psychiatry physician in 2024
3,498 Medicare Part D claims for 196 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Olanzapine295 claims
- Lithium Carbonate274 claims
- Quetiapine Fumarate196 claims
- Divalproex Sodium182 claims
- Benztropine Mesylate168 claims
- Hydroxyzine Pamoate143 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.
Bills Medicare through one group practice
- County OF SutterYuba City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter John Cotsirilos among 8,673 psychiatry physician records in California
Peter John Cotsirilos, 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 2009, is newer than 57% of them.
- NPI issued2009 · 57% of these records are older, 40% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated1987 · median 2005 among the 3,295 with a school on file
- Record last updated2022 · 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 Red Bluff → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Bailey BrittRed Bluff, CA 960801518741545
- Manoela Denman, M.D.Red Bluff, CA 960801023308525
- Howard Grindlinger, MDShingletown, CA 960881295718765
- Nicholas Brown, DOMount Shasta, CA 960671275939092
- Karndeep Samran, MDMt Shasta, CA 960671518371855
- Beth Wadman, M.D.Mount Shasta, CA 960671790859569
- William Lofthouse, MDYreka, CA 960971821197567
- Shepard Greene, M.D.Susanville, CA 961301639204357
Common questions
What is Peter John Cotsirilos, M.D.'s NPI number?
Peter John Cotsirilos, M.D.'s National Provider Identifier (NPI) is 1235378621, issued on Feb 10, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Peter John Cotsirilos, M.D. located?
The NPPES record lists a practice address at 925 Walnut St, Red Bluff, CA, 96080. Phone: (530) 567-7300. Providers update this record themselves, so call before visiting.
How can I verify Peter John Cotsirilos, M.D.'s license?
NPPES lists California license number G66322, 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 Peter John Cotsirilos, M.D. prescribe under Medicare Part D?
In 2024, Peter John Cotsirilos, M.D. had 3,498 Medicare Part D claims for 196 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.