Stephen T. Penepacker, MD
Psychiatry Physician · San Luis Obispo, CA
Stephen T. Penepacker, MD is a psychiatry physician with a practice address in San Luis Obispo, California, and NPI 1336165125, issued on Jul 14, 2006. Check the license (California C180768, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen T. Penepacker
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- C180768 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2178 Johnson Ave, San Luis Obispo, CA 93401
- Phone
- (805) 781-4700
- Enumerated
- Jul 14, 2006
- Record last updated
- Dec 9, 2025
- Fax
- (805) 781-1232
- Medicare enrollment
- Enrolled (PECOS I20240117000852); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 2178 Johnson Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adrianna Aguilar, LVNLicensed Vocational Nurse1730664855
- Jeanette AguilarCounselor1932576337
- Connie AhnerCounselor1447309026
- Adolphe AlexanderLicensed Vocational Nurse1316517303
- Donald AllardLicensed Vocational Nurse1144993817
- Kimberly Allen, PHD, RNRegistered Nurse1093460982
Verify Stephen T. Penepacker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C180768Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.1 times the Medicare Part D claims of the average psychiatry physician in 2024
4,057 Medicare Part D claims for 282 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Olanzapine310 claims
- Clonazepam252 claims
- Quetiapine Fumarate220 claims
- Clozapine169 claims
- Lamotrigine150 claims
- Gabapentin140 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.
Industry payments in 2024: $1,226.47
66 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- County OF San Luis ObispoSan Luis Obispo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen T. Penepacker among 8,673 psychiatry physician records in California
Stephen T. Penepacker, 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 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 fileYes · 38% of these records are
- Graduated1999 · median 2005 among the 3,295 with a school on file
- Record last updated2025 · 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).
39 psychiatry physician records list a practice address in San Luis Obispo
They are 39 of the 3,403 NPPES records with a practice address in San Luis Obispo, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in San Luis Obispo → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Abdellatif Aichouri, M.D., PH.DSan Luis Obispo, CA 934011871523019
- Richard Altesman, MDSan Luis Obispo, CA 934011730292350
- Margaret Bauman, M.D.San Luis Obispo, CA 934011184654337
- John Cannell, MDSan Luis Obispo, CA 934011114979374
- Rose Drago, MDSan Luis Obispo, CA 934011306904982
- Elisa Feingold, D.O.San Luis Obispo, CA 934011386681179
- Pedro Guimaraes, M.D.San Luis Obispo, CA 934011285624155
- June Kramer, MDSan Luis Obispo, CA 934011437215910
Common questions
What is Stephen T. Penepacker, MD's NPI number?
Stephen T. Penepacker, MD's National Provider Identifier (NPI) is 1336165125, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen T. Penepacker, MD located?
The NPPES record lists a practice address at 2178 Johnson Ave, San Luis Obispo, CA, 93401. Phone: (805) 781-4700. Providers update this record themselves, so call before visiting.
How can I verify Stephen T. Penepacker, MD's license?
NPPES lists California license number C180768, 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 Stephen T. Penepacker, MD prescribe under Medicare Part D?
In 2024, Stephen T. Penepacker, MD had 4,057 Medicare Part D claims for 282 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.