Peter S. Desilva, MD
Family Medicine Physician · Rancho Santa Margarita, CA
Peter S. Desilva, MD is a family medicine physician with a practice address in Rancho Santa Margarita, California, and NPI 1316045636, issued on Sep 20, 2006. Check the license (California A44436, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Peter S. Desilva
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A44436 CA
Self-reported in NPPES; status is on the state search - Practice location
- 29809 Santa Margarita Pkwy, Rancho Santa Margarita, CA 92688
- Phone
- (949) 709-5100
- Enumerated
- Sep 20, 2006
- Record last updated
- Nov 27, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (949) 709-5151
- Medicare enrollment
- Enrolled (PECOS I20110330000972); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At Houston, 1985
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 29809 Santa Margarita Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Natalia Bilan, MDFamily Medicine Physician1376644377
- Alexa Desilva, PA-CFamily Medicine Physician1023630753
Verify Peter S. Desilva in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A44436Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% more Medicare Part D claims than the average family medicine physician in 2024
4,278 Medicare Part D claims for 408 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 83 claims were for opioids.
Most prescribed
- Atorvastatin Calcium704 claims
- Lisinopril162 claims
- Tamsulosin Hcl160 claims
- Metformin Hcl Er149 claims
- Levothyroxine Sodium148 claims
- Amlodipine Besylate136 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: $786.08
32 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 55,478 providers of this specialty with any payment received $902.55 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
- Excel Physicians Medical CorporationRancho Santa Margarita, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter S. Desilva among 17,133 family medicine physician records in California
Peter S. Desilva, MD is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1985 · median 2005 among the 10,652 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 family medicine physician records list a practice address in Rancho Santa Margarita
They are 14 of the 479 NPPES records with a practice address in Rancho Santa Margarita, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Rancho Santa Margarita → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Mark Adlard, M.D.Rancho Santa Margarita, CA 926881346265766
- Natalia Bilan, MDRancho Santa Margarita, CA 926881376644377
- Mark Cianciola, MDRancho Santa Margarita, CA 926881750371035
- Eriel Datuin, MDRancho Santa Margarita, CA 926881487230249
- Alexa Desilva, PA-CRancho Santa Margarita, CA 926881023630753
- John Foley, MDRancho Santa Margarita, CA 926881699235515
- Huy Huynh, DORancho Santa Margarita, CA 926881851975866
- Kenneth Kazenelson, M.D.Rancho Santa Margarita, CA 926881275539637
Common questions
What is Peter S. Desilva, MD's NPI number?
Peter S. Desilva, MD's National Provider Identifier (NPI) is 1316045636, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter S. Desilva, MD located?
The NPPES record lists a practice address at 29809 Santa Margarita Pkwy, Rancho Santa Margarita, CA, 92688. Phone: (949) 709-5100. Providers update this record themselves, so call before visiting.
How can I verify Peter S. Desilva, MD's license?
NPPES lists California license number A44436, 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 S. Desilva, MD prescribe under Medicare Part D?
In 2024, Peter S. Desilva, MD had 4,278 Medicare Part D claims for 408 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.