Timothy Earl Sass, M.D.
Internal Medicine Physician · Princeton, NJ
Timothy Earl Sass, M.D. is an internal medicine physician with a practice address in Princeton, New Jersey, and NPI 1265573166, issued on Feb 12, 2007. Check the license (New Jersey 25MA05084900, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Timothy Earl Sass
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 25MA05084900 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 281 Witherspoon St, Princeton, NJ 08540
- Phone
- (609) 921-3362
- Enumerated
- Feb 12, 2007
- Record last updated
- Jan 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (609) 921-3584
- Medicare enrollment
- Enrolled (PECOS I20051003000588); may accept Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 281 Witherspoon St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Timothy Earl Sass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA05084900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,690 Medicare Part D claims for 302 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Amlodipine Besylate317 claims
- Atorvastatin Calcium163 claims
- Valsartan154 claims
- Triamterene-Hydrochlorothiazid106 claims
- Rosuvastatin Calcium102 claims
- Etodolac100 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.
The MIPS final score for 2023 (Medicare payment program): 26.2 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $270.85
10 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Timothy Earl Sass among 4,632 internal medicine physician records in New Jersey
Timothy Earl Sass, M.D. is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% 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 50% of them.
- NPI issued2007 · 50% of these records are older, 41% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1984 · median 2000 among the 3,132 with a school on file
- Record last updated2012 · 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 207R00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
66 internal medicine physician records list a practice address in Princeton
They are 66 of the 1,622 NPPES records with a practice address in Princeton, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Princeton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Barile, MDPrinceton, NJ 085401063461283
- Erinn Beagin, M.D.Princeton, NJ 085401619924388
- Frances Chang, MDPrinceton, NJ 085401316996960
- Savneet Chattha, MDPrinceton, NJ 085401629055181
- Douglas Corazza, MDPrinceton, NJ 085401376520825
- Nataliya Dashevsky, MDPrinceton, NJ 085401902857139
- Ernest De La Cruz, MDPrinceton, NJ 085401821075334
- Chandani Fernando, MDPrinceton, NJ 085401679513501
Common questions
What is Timothy Earl Sass, M.D.'s NPI number?
Timothy Earl Sass, M.D.'s National Provider Identifier (NPI) is 1265573166, issued on Feb 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Earl Sass, M.D. located?
The NPPES record lists a practice address at 281 Witherspoon St, Princeton, NJ, 08540. Phone: (609) 921-3362. Providers update this record themselves, so call before visiting.
How can I verify Timothy Earl Sass, M.D.'s license?
NPPES lists New Jersey license number 25MA05084900, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Timothy Earl Sass, M.D. prescribe under Medicare Part D?
In 2024, Timothy Earl Sass, M.D. had 2,690 Medicare Part D claims for 302 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Timothy Earl Sass, M.D.'s MIPS final score?
The 2023 MIPS final score is 26.2 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.