Deepak Thiagarajan, MD
Geriatric Medicine (Internal Medicine) Physician · Rancho Cucamonga, CA
Deepak Thiagarajan, MD is a geriatric medicine (internal medicine) physician with a practice address in Rancho Cucamonga, California, and NPI 1205052990, issued on Apr 18, 2007. Check the license (California A 113059, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Deepak Thiagarajan
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License numbers
- A 113059 CA
LP00988 RI
MD12318 RI
Self-reported in NPPES; status is on the state search - Practice location
- 7974 Haven Ave Ste 210, Rancho Cucamonga, CA 91730
- Phone
- (909) 881-5994
- Enumerated
- Apr 18, 2007
- Record last updated
- Apr 4, 2024
- Fax
- (909) 248-7769
- Medicaid ID
- DT68425 RI
- Medicare enrollment
- Enrolled (PECOS I20110419000793); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 7974 Haven Ave Ste 210
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hussein Abidali, DOGastroenterology Physician1205274768
- Rishi Talwar, MDInternal Medicine Physician1699184184
- Brianna VigilPhysician Assistant1780391326
Verify Deepak Thiagarajan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A 113059Check 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% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
3,338 Medicare Part D claims for 153 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 122 claims were for opioids.
Most prescribed
- Atorvastatin Calcium235 claims
- Gabapentin134 claims
- Amlodipine Besylate123 claims
- Levetiracetam108 claims
- Eliquis106 claims
- Pantoprazole Sodium99 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
- United Hospitalist IncRancho Cucamonga, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Deepak Thiagarajan among 532 geriatric medicine (internal medicine) physician records in California
Deepak Thiagarajan, MD is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 34% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2002 · median 1999 among the 271 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in Rancho Cucamonga → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Harvey Cohen, MDRancho Cucamonga, CA 917301972517423
- Khine Phyu, MDEl Monte, CA 917311639296700
- Anthony Kingsley, MDEl Monte, CA 917331750456349
- Albert Bui, M.D.Hacienda Heights, CA 917451548536188
- Ryan Uyan, MDMonterey Park, CA 917541275996050
- Hedy Loa, MDOntario, CA 917621093720666
- Sudhakar Kona, MDPomona, CA 917671619080215
- Dan Tran, M.D.Rosemead, CA 917701487709747
Common questions
What is Deepak Thiagarajan, MD's NPI number?
Deepak Thiagarajan, MD's National Provider Identifier (NPI) is 1205052990, issued on Apr 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Deepak Thiagarajan, MD located?
The NPPES record lists a practice address at 7974 Haven Ave Ste 210, Rancho Cucamonga, CA, 91730. Phone: (909) 881-5994. Providers update this record themselves, so call before visiting.
How can I verify Deepak Thiagarajan, MD's license?
NPPES lists California license number A 113059, 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 Deepak Thiagarajan, MD prescribe under Medicare Part D?
In 2024, Deepak Thiagarajan, MD had 3,338 Medicare Part D claims for 153 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.