WILLIAM N SEGAL MD
NPI 1881694974
Internal Medicine - Gastroenterology in Princeton, NJ

Q: What is William Segal's NPI number?

The NPI number for William Segal is 1881694974. It was assigned to this individual provider in the NPPES registry on July 29, 2005.

Q: What is William Segal's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for William Segal was last updated on December 11, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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 July 29, 2005PECOS EnrolledAccepts Medicare Assignment

89.32/100

CMS Quality Rating

731 ALEXANDER RD, SUITE 100, PRINCETON, NJ 08540(609) 924-1422(609) 924-7473 Get Directions Write a Review

NPPES record last updated: December 11, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About William N Segal Md NPPES

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

WILLIAM N SEGAL MD (NPI 1881694974) is an individual gastroenterology provider in Princeton, New Jersey, licensed in New Jersey (25MA06364000) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, is affiliated with University Medical Center Of Princeton At Plainsboro, and is a graduate of Other (1990).

NPPES Registry Identity

NPI1881694974

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameWILLIAM N SEGALCredential: MD

Location Address731 ALEXANDER RD, SUITE 100Princeton, NJ 08540-6345

Mailing Address731 Alexander Rd, Suite 100Princeton, NJ 08540-6345 · (609) 924-1422 · Fax (609) 924-7473

Phone(609) 924-1422

Fax(609) 924-7473

Sole ProprietorNo

Medical School CMSOtherGraduated 1990

Enumeration DateJuly 29, 2005

Last NPPES UpdateDecember 11, 2019

✔ NPI 1881694974 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in NJ · 25MA06364000

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

731 ALEXANDER RD, Princeton, NJ 08540

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Other Identifiers 9

Medicaid7517106NJ

Other00795866Independence Blue Cross

Other1492643004Cigna

OtherP399224Oxford

Other000865670Amerihealth Pers. Choice

Other0821011000Keystone

Other100010067Railroad Medicare

Other000795866Personal Choice

Other0981974000Amerihealth Hmo

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 and accepts Medicare assignment

William N Segal Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID345260238

PECOS Enrollment IDI20100809000559

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 Reassignments

Medicare enrollment records show William Segal reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Princeton Healthcare Affiliated Physicians PC

2.2 mi

Internal Medicine

186 PRINCETON HIGHTSTOWN RD, BUILDING 3A, STE 101
West Windsor, NJ 08550

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

NPI 1568818623 (609) 443-1150

Clinical Health Care Associates Of New Jersey, PC

12 mi

Otolaryngology

719 US HIGHWAY 206 STE 101
Hillsborough, NJ 08844

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

NPI 1962977249 (908) 271-2102

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 13

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.

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.

214 services150 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

89 services89 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

79 services76 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.

63 services61 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

59 services59 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

48 services48 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

37 services37 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

37 services23 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.

32 services28 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

22 services22 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

15 services15 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

14 services14 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

13 services13 patients

Hospital Affiliations CMS Care Compare 2

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

Hospital Of Univ Of Pennsylvania

Acute Care Hospitals · Philadelphia, PA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number390111

Location34th & Spruce StsPhiladelphia, PA 19104 · Philadelphia 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.

89.32/100

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

Scored as part of a group practice

Quality

80.59

Promoting Interoperability

100

Improvement Activities

Other Providers at the Same Location NPPES 10

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

GLENN L OSIAS MD

Internal Medicine (Gastroenterology)

731 ALEXANDER RD, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 924-1422

AMY RUBIN SHRIVER M.D.

Internal Medicine (Gastroenterology)

731 ALEXANDER RD, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 924-1422

PRINCETON GASTROENTEROLOGY ASSOC

Internal Medicine (Gastroenterology)

731 ALEXANDER RD, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 924-1422

DR. BANU MAHALINGHAM MD

Specialist

731 ALEXANDER RD, SUITE 202
PRINCETON, NJ 08540

Mercer County (609) 921-7456

PRINCETON ENDOSCOPY CENTER LLC

Clinic/Center (Ambulatory Surgical)

731 ALEXANDER RD, SUITE 104
PRINCETON, NJ 08540

Mercer County (609) 452-1111

PRATEEK SINGH BAGHEL

Internal Medicine (Cardiovascular Disease)

731 ALEXANDER RD, STE 202
PRINCETON, NJ 08540

Mercer County (609) 921-7456

ROBERT F MEIROWITZ MD

Internal Medicine (Gastroenterology)

731 ALEXANDER RD, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 924-1422

AARON BELLOWS M.D.

Internal Medicine (Gastroenterology)

731 ALEXANDER RD, SUITE 100
PRINCETON, NJ 08540

Mercer County (609) 924-1422

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 William Segal's NPI number?

The NPI number for William Segal is 1881694974. It was assigned to this individual provider in the NPPES registry on July 29, 2005.

Where is William Segal located?

William Segal practices at 731 Alexander Rd Suite 100, Princeton, NJ 08540. The listed phone number is (609) 924-1422.

What is William Segal's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is William Segal enrolled in Medicare?

Yes. William Segal is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for William Segal's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Segal reassigns Medicare benefits to 2 organizations: Princeton Healthcare Affiliated Physicians PC (West Windsor, NJ) and Clinical Health Care Associates Of New Jersey, PC (Hillsborough, NJ). Each 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 William Segal's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Segal accept?

Health plans from Oscar Health list William Segal 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 William Segal affiliated with any hospitals?

According to CMS data, William Segal is affiliated with University Medical Center Of Princeton At Plainsboro and Hospital Of Univ Of Pennsylvania.

When was this NPI record last updated?

The NPPES record for William Segal was last updated on December 11, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.