Iwan Nyotowidjojo, M.D.
Internal Medicine Physician · Rancho Santa Margarita, CA
Iwan Nyotowidjojo, M.D. is an internal medicine physician with a practice address in Rancho Santa Margarita, California, and NPI 1578976270, issued on Jun 10, 2014. Check the license (California A167115, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Iwan Nyotowidjojo
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A167115 CA
45679 AL
68913 AZ
R74508 AZ
DR.0069772 CO
and 10 more
Self-reported in NPPES; status is on the state search - Practice location
- 29472 Avenida DE Las Banderas, Rancho Santa Margarita, CA 92688
- Phone
- (949) 459-9968
- Enumerated
- Jun 10, 2014
- Record last updated
- Jul 17, 2024
- Fax
- (949) 766-2565
- Medicare enrollment
- Enrolled (PECOS I20230607000005); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 29472 Avenida DE Las Banderas
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kimberly Aguilar, DNP FNP-C, RNFamily Nurse Practitioner1104539295
- Eriel Datuin, MDFamily Medicine Physician1487230249
- John Foley, MDFamily Medicine Physician1699235515
- Huy Huynh, DOFamily Medicine Physician1851975866
- Annelise Merriner, PA-CPhysician Assistant1811238777
- Tri Tran, PA-CMedical Physician Assistant1427447713
Verify Iwan Nyotowidjojo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A167115Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,607 Medicare Part D claims for 287 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 11 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium94 claims
- Amlodipine Besylate82 claims
- Atorvastatin Calcium79 claims
- Levothyroxine Sodium53 claims
- Lisinopril47 claims
- Losartan Potassium43 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
- Friends OF Family Health CenterTustin, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Iwan Nyotowidjojo among 17,696 internal medicine physician records in California
Iwan Nyotowidjojo, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2014 · median 2004 among the 11,065 with a school on file
- Record last updated2024 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 internal medicine physician records list a practice address in Rancho Santa Margarita
They are 7 of the 479 NPPES records with a practice address in Rancho Santa Margarita, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Rancho Santa Margarita → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Yolanda Gomez, MDRancho Santa Margarita, CA 926881306842877
- Gwendolyn Gore, MDRancho Santa Margarita, CA 926881811900129
- Sridhar Kundula, M.D.Rancho Santa Margarita, CA 926881518301449
- Deepak Patel, MDRancho Santa Margarita, CA 926881437123965
- Lilian Tran, MDRancho Santa Margarita, CA 926881134190234
- Siamak Zamani, M.D.Rancho Santa Margarita, CA 926881730245358
- Bahman Badie, M.D.Mission Viejo, CA 926911396721916
- Sherif El Sokkary, M.D.Mission Viejo, CA 926911710964432
Common questions
What is Iwan Nyotowidjojo, M.D.'s NPI number?
Iwan Nyotowidjojo, M.D.'s National Provider Identifier (NPI) is 1578976270, issued on Jun 10, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Iwan Nyotowidjojo, M.D. located?
The NPPES record lists a practice address at 29472 Avenida DE Las Banderas, Rancho Santa Margarita, CA, 92688. Phone: (949) 459-9968. Providers update this record themselves, so call before visiting.
How can I verify Iwan Nyotowidjojo, M.D.'s license?
NPPES lists California license number A167115, 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 Iwan Nyotowidjojo, M.D. prescribe under Medicare Part D?
In 2024, Iwan Nyotowidjojo, M.D. had 1,607 Medicare Part D claims for 287 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.