TIMOTHY EARL SASS M.D.
NPI 1265573166
Internal Medicine in Princeton, NJ

Q: What is Timothy Sass's NPI number?

The NPI number for Timothy Sass is 1265573166. It was assigned to this individual provider in the NPPES registry on February 12, 2007.

Q: What is Timothy Sass's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Timothy Sass was last updated on January 12, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since February 12, 2007PECOS Enrolled

26.15/100

CMS Quality Rating

281 WITHERSPOON ST, SUITE 220, PRINCETON, NJ 08540(609) 921-3362(609) 921-3584 Get Directions Write a Review

NPPES record last updated: January 12, 2012. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Timothy Earl Sass M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

TIMOTHY EARL SASS M.D. (NPI 1265573166) is an individual internal medicine provider in Princeton, New Jersey, licensed in New Jersey (25MA05084900) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with University Medical Center Of Princeton At Plainsboro, and is a graduate of George Washington University School Of Medicine (1984).

NPPES Registry Identity

NPI1265573166

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameTIMOTHY EARL SASSCredential: M.D.

Location Address281 WITHERSPOON ST, SUITE 220Princeton, NJ 08540-3210

Mailing Address281 Witherspoon St, Suite 220Princeton, NJ 08540-3210 · (609) 921-3362 · Fax (609) 921-3584

Phone(609) 921-3362

Fax(609) 921-3584

Sole ProprietorNo

Medical School CMSGeorge Washington University School Of MedicineGraduated 1984

Enumeration DateFebruary 12, 2007

Last NPPES UpdateJanuary 12, 2012

✔ NPI 1265573166 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in NJ · 25MA05084900

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

281 WITHERSPOON ST, Princeton, NJ 08540

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Other Identifiers 4

Other204543356NJ · Tax Id Number

Other223457805NJ · Tax Id Number

Medicare ID-Type Unspecified885917NJ

Medicare UPINC57784NJ

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Timothy Earl Sass M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID5799710307

PECOS Enrollment IDI20051003000588

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Timothy Sass reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Princeton Internal Medicine Associates, P.C.

4.0 mi

Internal Medicine

88 PRINCETON HIGHTSTOWN RD STE 210
West Windsor, NJ 08550

Reassigned Medicare billing, New Jersey enrollment
3 clinicians in this Medicare group

NPI 1740321660 (609) 799-0100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 29

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Test to measure oxygen level in blood using ear or finger device continuously overnight 94762

This procedure involves using a small device, placed on your ear or finger, to continuously monitor your blood oxygen level overnight. It's painless, non-invasive, and helps assess your body's oxygen supply during sleep.

832 services285 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

335 services247 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

322 services166 patients

Urinalysis, manual test 81002

A urinalysis is a simple, non-invasive test that checks the urine for various elements such as sugar, protein, and signs of infection. It can help detect many common conditions, including kidney disease and diabetes. The manual test involves a lab technician examining a urine sample.

299 services255 patients

Analysis of substance using immunoassay technique, single step method 83518

This is a test that identifies specific substances in a sample. The immunoassay technique uses antibodies to detect these substances. It's a single-step method, meaning it's quick and straightforward. It's commonly used to detect drugs, hormones, or other substances in the body.

299 services254 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

295 services160 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

294 services235 patients

Blood glucose (sugar) test performed by hand-held instrument 82962

A blood glucose test uses a handheld device to measure the amount of sugar in your blood. A small prick on your finger allows a drop of blood to be placed on a test strip, which is then read by the device. This helps monitor and manage diabetes effectively.

274 services236 patients

Hemoglobin a1c level 83036

Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.

273 services235 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

255 services227 patients

Annual alcohol misuse screening, 5 to 15 minutes G0442

An annual alcohol misuse screening is a 15-minute check-up to assess your drinking habits. It helps identify if you're consuming alcohol in a way that could harm your health. This is not a judgment, but a tool to promote your wellbeing.

241 services241 patients

Stool analysis for blood to screen for colon tumors 82270

A stool analysis for blood is a non-invasive procedure used to check for the presence of hidden blood in your stool. This can be an early sign of colon tumors. The test involves collecting a small sample of stool at home and sending it to a lab for analysis.

234 services234 patients

Annual depression screening, 5 to 15 minutes G0444

An annual depression screening is a short, routine evaluation to check for signs of depression. It involves answering a series of questions about your feelings, thoughts, and behaviors. The process takes about 15 minutes and helps detect depression early for better management.

203 services203 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

196 services196 patients

Assessment of emotional or behavioral problems 96127

Assessment of emotional or behavioral problems involves a thorough evaluation of your feelings, thoughts, and behaviors. It's a process where professionals study patterns over time to identify potential issues like anxiety, depression, or other mental health conditions.

128 services103 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

125 services117 patients

Influenza vaccine split virus, preservative free 90662

The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.

119 services112 patients

Brief face-to-face behavioral counseling for alcohol misuse, 15 minutes G0443

This service involves a short, 15-minute counseling session to address alcohol misuse. A healthcare professional will discuss your drinking habits, potential risks, and strategies for change. It's a supportive, confidential space to explore healthier behaviors.

113 services71 patients

Administration of pneumococcal vaccine G0009

The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.

52 services51 patients

Pneumococcal vaccine, 23-valent 90732

The 23-valent pneumococcal vaccine is an injection that helps protect against serious infections caused by 23 types of pneumococcal bacteria. It's vital for those at risk, like older adults or people with certain health conditions, to prevent pneumonia, meningitis, and bloodstream infections.

47 services47 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

45 services16 patients

Telephone medical discussion with physician, 21-30 minutes 99443

This service involves a 21-30 minute phone conversation with a physician. It's a chance for you to discuss your health concerns, symptoms or treatment plans. It's similar to an in-person consultation, but conducted over the phone for your convenience and safety.

30 services27 patients

Transitional care management services for problem of high complexity 99496

Transitional care management services are designed to ensure a smooth transition from a hospital to home or another care setting for patients with complex health issues. These services include medication management, patient education, and coordination with healthcare providers.

27 services20 patients

Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg J3420

This is a procedure where a small dose of Vitamin B-12, also known as Cyanocobalamin, is injected into your body. This vitamin is essential for nerve function and the production of red blood cells. It's often used to treat vitamin B-12 deficiency.

25 services13 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

20 services20 patients

Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment G0402

An Initial Preventive Physical Examination, also known as a "Welcome to Medicare" visit, is a one-time, face-to-face visit during your first 12 months of Medicare enrollment. It includes a review of your health, as well as education and counseling about preventive services and further screenings.

20 services20 patients

Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report G0403

An Electrocardiogram (ECG) with 12 leads is a non-invasive test that measures the electrical activity of your heart. It's performed during your initial physical examination to screen for heart conditions. The results are interpreted and compiled into a report for further evaluation.

16 services16 patients

Test to measure expiratory airflow and volume 94010

This test, known as spirometry, assesses how well your lungs work. It measures how much air you can inhale, how much you can exhale and how quickly you can exhale. It's non-invasive and helps diagnose conditions like asthma or COPD.

15 services15 patients

Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit G0438

An annual wellness visit is a yearly appointment with your doctor to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's an opportunity to discuss your health status and goals and get a plan tailored for you.

14 services14 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

University Medical Center Of Princeton At Plainsboro

Acute Care Hospitals · Plainsboro, NJ

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number310010

LocationOne-Five Plainsboro RoadPlainsboro, NJ 08536 · Middlesex County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 08540 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$140.34 typical visit price

range $61.59 – $185.05

Typical copayment $35.08 (range $15.39 – $46.26)

Most-billed visit code 99204

Established Patient

$107.94 typical visit price

range $20.08 – $150.98

Typical copayment $26.98 (range $5.02 – $37.74)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

26.15/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Quality

Improvement Activities

Cost

87.19

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STEFANIE NICOSIA APN

Nurse Practitioner

281 WITHERSPOON ST, STE 210
PRINCETON, NJ 08540

Mercer County (609) 921-7456

DR. ROBERT L PICKENS M.D.

Urology

281 WITHERSPOON ST, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 924-6626

UROLOGY SURGICAL PRACTICE OF PRINCETON

Clinic/Center (Ambulatory Surgical)

281 WITHERSPOON ST, SUITE P
PRINCETON, NJ 08540

Mercer County (609) 924-6692

INTERNAL MEDICINE ASSOCIATES AT PRINCETON, LLC

Internal Medicine

281 WITHERSPOON ST, SUITE 220
PRINCETON, NJ 08540

Mercer County (609) 921-3362

PRINCETON ANESTHESIA SERVICES, PC

Anesthesiology

281 WITHERSPOON ST
PRINCETON, NJ 08540

Mercer County (609) 430-7174

PRINCETON WOMENS HEALTH

Obstetrics & Gynecology (Gynecology)

281 WITHERSPOON ST, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 921-8816

PROFESSIONAL OCCUPATIONAL & PHYSICAL THERAPY, PLLC

Occupational Therapist

281 WITHERSPOON ST
PRINCETON, NJ 08540

Mercer County (609) 279-2194

PRINCETON OSTEOPOROSIS CENTER PA

Internal Medicine (Rheumatology)

281 WITHERSPOON ST, SUITE 200
PRINCETON, NJ 08540

Mercer County (609) 921-3331

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Timothy Sass's NPI number?

The NPI number for Timothy Sass is 1265573166. It was assigned to this individual provider in the NPPES registry on February 12, 2007.

Where is Timothy Sass located?

Timothy Sass practices at 281 Witherspoon St Suite 220, Princeton, NJ 08540. The listed phone number is (609) 921-3362.

What is Timothy Sass's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Timothy Sass enrolled in Medicare?

Yes. Timothy Sass is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Timothy Sass's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Sass reassigns Medicare benefits to Princeton Internal Medicine Associates, P.C. (West Windsor, NJ). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Timothy Sass's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Timothy Sass accept?

Health plans from Oscar Health list Timothy Sass as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Timothy Sass affiliated with any hospitals?

According to CMS data, Timothy Sass is affiliated with University Medical Center Of Princeton At Plainsboro.

When was this NPI record last updated?

The NPPES record for Timothy Sass was last updated on January 12, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.