Juliet M. Penn, M.D.
Medical Oncology Physician · Santa Barbara, CA
Juliet M. Penn, M.D. is a medical oncology physician with a practice address in Santa Barbara, California, and NPI 1215175070, issued on Jan 31, 2009. Check the license (California A105540, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Juliet M. Penn
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- A105540 CA
Self-reported in NPPES; status is on the state search - Practice location
- 309 W Quinto St, Santa Barbara, CA 93105
- Phone
- (805) 563-0041
- Enumerated
- Jan 31, 2009
- Record last updated
- Dec 14, 2022
- Fax
- (805) 563-0051
- Medicaid ID
- 1215175070 CA
- Medicare enrollment
- Enrolled (PECOS I20150423000059); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 309 W Quinto St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Julian Davis, MDHematology & Oncology Physician1801159967
- Daniel Greenwald, M.D.Medical Oncology Physician1235240987
- Frederic Kass, MDHematology & Oncology Physician1538181110
- Amanda Sweet, P.A.Physician Assistant1811186018
Verify Juliet M. Penn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A105540Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average medical oncology physician in 2024
529 Medicare Part D claims for 122 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 45 claims were for opioids.
Most prescribed
- Anastrozole35 claims
- Ondansetron Odt31 claims
- Prednisone29 claims
- Hydrocodone-Acetaminophen19 claims
- Verzenio18 claims
- Lorazepam16 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: $242.81
7 payments; by number, the most common kind was food and beverage; the largest payer was Sumitomo Pharma America, Inc. The 3,343 providers of this specialty with any payment received $11,773.47 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
- The Regents OF The University OF CaliforniaSanta Barbara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Juliet M. Penn among 447 medical oncology physician records in California
Juliet M. Penn, M.D. is one of 447 medical oncology physician records with a practice address in California. 82% 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 62% of them.
- NPI issued2009 · 62% of these records are older, 35% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2005 · median 2004 among the 312 with a school on file
- Record last updated2022 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in California
There are 447 medical oncology physician records in California.
All 447 in California → Every provider in Santa Barbara → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Daniel Greenwald, M.D.Santa Barbara, CA 931051235240987
- Mukul Gupta, M.D.Santa Barbara, CA 931051295843738
- Melissa Cohen, M.D.Simi Valley, CA 930651174763262
- Jay Klarnet, MDOxnard, CA 930301538258314
- Robert Ouwendijk, M.D.Ventura, CA 930031578627725
- Evan Slater, M.D.Ventura, CA 930031992869044
- Robert Havard, MDVisalia, CA 932771225002694
- Farshid Dayyani, M.D., PH.D.Orange, CA 928681376710434
Common questions
What is Juliet M. Penn, M.D.'s NPI number?
Juliet M. Penn, M.D.'s National Provider Identifier (NPI) is 1215175070, issued on Jan 31, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Juliet M. Penn, M.D. located?
The NPPES record lists a practice address at 309 W Quinto St, Santa Barbara, CA, 93105. Phone: (805) 563-0041. Providers update this record themselves, so call before visiting.
How can I verify Juliet M. Penn, M.D.'s license?
NPPES lists California license number A105540, 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 Juliet M. Penn, M.D. prescribe under Medicare Part D?
In 2024, Juliet M. Penn, M.D. had 529 Medicare Part D claims for 122 beneficiaries; the average among medical oncology physician prescribers was 703. 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.