Siegfried Willem Tjonajong, DMD MSD
Dentist · Ridgewood, NJ
Siegfried Willem Tjonajong, DMD MSD is a dentist with a practice address in Ridgewood, New Jersey, and NPI 1801049234, issued on Oct 29, 2008. Check the license (New Jersey 22DIO1785000, as entered in NPPES) with the New Jersey board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Siegfried Willem Tjonajong
- Credential
- DMD MSD
- Primary taxonomy
- Dentist 122300000X
- License numbers
- 22DIO1785000 NJ
NJ-3807 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 947 Linwood Ave Ste 1, Ridgewood, NJ 07450
- Phone
- (201) 670-4800
- Enumerated
- Oct 29, 2008
- Record last updated
- Oct 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (201) 670-6776
- Entity
- Type 1 · individual
8 nearest dentist records → All 2,742 in New Jersey → Look up another NPI →
Verify Siegfried Willem Tjonajong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New Jersey board licenses this profession
Search for license 22DIO1785000Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% more Medicare Part D claims than the average dentist in 2024
108 Medicare Part D claims for 37 beneficiaries, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin24 claims
- Chlorhexidine Gluconate20 claims
- Alprazolam13 claims
- Doxycycline Hyclate11 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.
Siegfried Willem Tjonajong among 2,742 dentist records in New Jersey
Siegfried Willem Tjonajong, DMD MSD is one of 2,742 dentist records with a practice address in New Jersey. 63% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 44% of them.
- NPI issued2008 · 44% of these records are older, 47% newer
- In a Medicare fileYes · 63% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2008 · 74% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 dentist records list a practice address in Ridgewood
They are 14 of the 1,059 NPPES records with a practice address in Ridgewood, and 2,742 dentist records in New Jersey.
All 2,742 in New Jersey → Every provider in Ridgewood → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Laurie Addvensky, D.M.D.Ridgewood, NJ 074501003027160
- Lindsay Bachrach, DMDRidgewood, NJ 074501306287545
- Warren Boardman, DMDRidgewood, NJ 074501427096924
- Michael Fleisig, DDSRidgewood, NJ 074501922286293
- John Ianzano, D.M.D., M.S.D.Ridgewood, NJ 074501962583385
- Albert Kurpis, DDSRidgewood, NJ 074501972727303
- Robert Miner, Dds, ROBERT D. MINER, DDSRidgewood, NJ 074501689893216
- Ibrahim Mirkhan, DMDRidgewood, NJ 074501780739326
Common questions
What is Siegfried Willem Tjonajong, DMD MSD's NPI number?
Siegfried Willem Tjonajong, DMD MSD's National Provider Identifier (NPI) is 1801049234, issued on Oct 29, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Siegfried Willem Tjonajong, DMD MSD located?
The NPPES record lists a practice address at 947 Linwood Ave Ste 1, Ridgewood, NJ, 07450. Phone: (201) 670-4800. Providers update this record themselves, so call before visiting.
How can I verify Siegfried Willem Tjonajong, DMD MSD's license?
NPPES lists New Jersey license number 22DIO1785000, as entered by the provider. Search the New Jersey board that licenses this profession; the NPPES record confirms identity only.
How much does Siegfried Willem Tjonajong, DMD MSD prescribe under Medicare Part D?
In 2024, Siegfried Willem Tjonajong, DMD MSD had 108 Medicare Part D claims for 37 beneficiaries; the average among dentist prescribers was 86. 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.