Ronald De La Pena, M.D.
Obstetrics & Gynecology Physician · Thousand Oaks, CA
Ronald De La Pena, M.D. is an obstetrics & gynecology physician with a practice address in Thousand Oaks, California, and NPI 1194779710, issued on May 19, 2006. Check the license (California A54034, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald De La Pena
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A54034 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2230 Lynn RD, Thousand Oaks, CA 91360
- Phone
- (805) 495-1066
- Enumerated
- May 19, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (805) 497-1428
- Medicaid ID
- 00A540340 CA
- Medicare enrollment
- Enrolled (PECOS I20110722000699); accepts Medicare assignment
- Medical or professional school
- Texas Tech University Health Science Center School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 2230 Lynn RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Shahram Daneshgar, MDGastroenterology Physician1730191875
- Russell Hines, M.D.Internal Medicine Physician1548213101
Verify Ronald De La Pena in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A54034Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
186 Medicare Part D claims for 56 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Estradiol57 claims
- Premarin16 claims
- Progesterone13 claims
- Estring12 claims
- Lorazepam12 claims
- Estradiol (Twice Weekly)11 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: $1,091.36
52 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 21,429 providers of this specialty with any payment received $1,030.61 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
- Arroyo Oaks Medical Associates IncThousand Oaks, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald De La Pena among 5,088 obstetrics & gynecology physician records in California
Ronald De La Pena, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1995 · median 2004 among the 2,700 with a school on file
- Record last updated2026 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Thousand Oaks → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Diana Glasser, M.D.Thousand Oaks, CA 913601780962308
- Ted Lin, MDThousand Oaks, CA 913601245389881
- Raymond Poliakin, MDThousand Oaks, CA 913601386707636
- Bert Schoenkerman, M.D.Thousand Oaks, CA 913601245300268
- Paul Toomer, M.D.Thousand Oaks, CA 913601568472561
- Thomas Vangeem, M.D.Thousand Oaks, CA 913601801974779
- Mirela CernaianuThousand Oaks, CA 913611467465120
- Christin Field, MDWestlake Village, CA 913611245201912
Common questions
What is Ronald De La Pena, M.D.'s NPI number?
Ronald De La Pena, M.D.'s National Provider Identifier (NPI) is 1194779710, issued on May 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald De La Pena, M.D. located?
The NPPES record lists a practice address at 2230 Lynn RD, Thousand Oaks, CA, 91360. Phone: (805) 495-1066. Providers update this record themselves, so call before visiting.
How can I verify Ronald De La Pena, M.D.'s license?
NPPES lists California license number A54034, 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 Ronald De La Pena, M.D. prescribe under Medicare Part D?
In 2024, Ronald De La Pena, M.D. had 186 Medicare Part D claims for 56 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.