Janja Viltuznik, M.D.
Adult Medicine Physician · Orange, CA
Janja Viltuznik, M.D. is an adult medicine physician with a practice address in Orange, California, and NPI 1639182702, issued on Aug 13, 2006. Check the license (California A42658, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Janja Viltuznik
- Credential
- M.D.
- Primary taxonomy
- Adult Medicine Physician 207QA0505X
- License number
- A42658 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2617 E Chapman Ave, Orange, CA 92869
- Phone
- (714) 538-6822
- Enumerated
- Aug 13, 2006
- Record last updated
- Oct 25, 2022
- Fax
- (714) 280-4826
- Medicare enrollment
- Enrolled (PECOS I20101012000108); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest adult medicine physician records → All 386 in California → Look up another NPI →
Also registered at 2617 E Chapman Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Janja Viltuznik in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A42658Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% more Medicare Part D claims than the average adult medicine physician in 2024
4,798 Medicare Part D claims for 423 beneficiaries, against an average of 3,002 among the 1,307 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 97 claims were for opioids.
Most prescribed
- Levothyroxine Sodium255 claims
- Atorvastatin Calcium250 claims
- Losartan Potassium184 claims
- Amlodipine Besylate153 claims
- Valsartan151 claims
- Lisinopril110 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: $2,255.22
67 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 664 providers of this specialty with any payment received $1,405.95 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
- Astra Medical GroupOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Janja Viltuznik among 386 adult medicine physician records in California
Janja Viltuznik, M.D. is one of 386 adult medicine physician records with a practice address in California. 69% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 65% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 48% of these records are
- Graduated1981 · median 2005 among the 187 with a school on file
- Record last updated2022 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0505X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Medicine Physician providers in California
There are 386 adult medicine physician records in California.
All 386 in California → Every provider in Orange → Adult Medicine Physician nationwide →
The 8 adult medicine physician records with the nearest ZIP codes
- Sean Breen, D.O.Orance, CA 928691780839217
- Philip Madrid, MDOrange, CA 928691578523692
- Jack Mossler, MDOrange, CA 928691619234887
- Mary Cerni, D.O.Placentia, CA 928701164519989
- Maryann Nuesse, D.O.Orange, CA 928661689633455
- William Nuesse, M.D.Orange, CA 928661952360729
- Harry EisenbachVilla Park, CA 928611619597671
- Kathryn Gibbs, M.D.Villa Park, CA 928611124238308
Common questions
What is Janja Viltuznik, M.D.'s NPI number?
Janja Viltuznik, M.D.'s National Provider Identifier (NPI) is 1639182702, issued on Aug 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Janja Viltuznik, M.D. located?
The NPPES record lists a practice address at 2617 E Chapman Ave, Orange, CA, 92869. Phone: (714) 538-6822. Providers update this record themselves, so call before visiting.
How can I verify Janja Viltuznik, M.D.'s license?
NPPES lists California license number A42658, 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 Janja Viltuznik, M.D. prescribe under Medicare Part D?
In 2024, Janja Viltuznik, M.D. had 4,798 Medicare Part D claims for 423 beneficiaries; the average among adult medicine physician prescribers was 3,002. 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.