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DR. WILLIAM J. KOSTIS PH.D., M.D.
NPI 1922203439
Internal Medicine in New Brunswick, NJ

Active since June 15, 2007PECOS EnrolledAccepts Medicare Assignment
75/100
CMS Quality Rating
125 PATERSON ST, CAB-5200, NEW BRUNSWICK, NJ 08901(732) 235-6561 Get Directions Write a Review

NPPES record last updated: April 30, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. William J. Kostis Ph.d., M.d. NPPES

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

DR. WILLIAM J. KOSTIS PH.D., M.D. (NPI 1922203439) is an individual internal medicine provider in New Brunswick, New Jersey, licensed in New Jersey (25MA09632800) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS, is affiliated with University Medical Center Of Princeton At Plainsboro, and is a graduate of Rutgers R W Johnson Medical School (cam/new Bruns/pisc) (2007).

NPPES Registry Identity

NPI1922203439
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WILLIAM J. KOSTISCredential: PH.D., M.D.
Location Address125 PATERSON ST, CAB-5200New Brunswick, NJ 08901-1962
Mailing Address125 Paterson St, Cab-5200New Brunswick, NJ 08901-1962 · (732) 235-6561
Phone(732) 235-6561
Sole ProprietorNo
Medical School CMSRutgers R W Johnson Medical School (cam/new Bruns/pisc)Graduated 2007
Enumeration DateJune 15, 2007
Last NPPES UpdateApril 30, 2024
NPPES CertifiedApril 30, 2024
✔ NPI 1922203439 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in NJ · 25MA09632800✔ Licensed in MA · 240190
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.
Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License 25MA09632800 (NJ), 240190 (MA)
Also ListedInternal Medicine · Clinical Cardiac ElectrophysiologyTaxonomy 207RC0001X · License 25MA09632800 (NJ), 240190 (MA)
125 PATERSON ST, New Brunswick, NJ 08901
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware, 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

Dr. William J. Kostis Ph.d., M.d. 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 ID4082871868
PECOS Enrollment IDI20150508001049
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 William Kostis reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Rutgers Health-Rwj Scleroderma Program
Same address
Rheumatology
125 PATERSON ST, SUITE 5200A
New Brunswick, NJ 08901
  • Reassigned Medicare billing, New Jersey enrollment
  • 641 clinicians in this Medicare group
NPI 1003988635 (732) 235-7217

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 16

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.

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
3,179 services2,159 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.
265 services179 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
171 services85 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.
131 services91 patients
Programming of dual lead pacemaker system 93280
Programming of a dual lead pacemaker system is a procedure to adjust your heart's pacemaker settings. This process involves a small device, called a programmer, that communicates with your pacemaker to ensure it's working optimally for your heart's needs.
85 services60 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
77 services70 patients

Hospital Affiliations CMS Care Compare 5

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

Robert Wood Johnson University Hospital

Acute Care Hospitals · New Brunswick, NJ
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310038
LocationOne Robert Wood Johnson PlaceNew Brunswick, NJ 08901 · Middlesex County
Emergency services Birthing friendly

Community Medical Center

Acute Care Hospitals · Toms River, NJ
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310041
Location99 Rt 37 WestToms River, NJ 08755 · Ocean County
Emergency services Birthing friendly

Robert Wood Johnson University Hospital - Somerset

Acute Care Hospitals · Somerville, NJ
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310048
Location110 Rehill AveSomerville, NJ 08876 · Somerset County
Emergency services Birthing friendly

Robert Wood Johnson University Hospital At Hamilton

Acute Care Hospitals · Hamilton, NJ
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310110
LocationOne Hamilton Health PlaceHamilton, NJ 08690 · Mercer County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 08901 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
$144.86 typical visit price
range $63.84 – $190.92
Typical copayment $36.21 (range $15.96 – $47.73)
Most-billed visit code 99204
Established Patient
$111.57 typical visit price
range $20.97 – $155.92
Typical copayment $27.89 (range $5.24 – $38.98)
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.

75/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice

Reported Quality Measures

e-Prescribing
At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.
96%877 patients4/55-star benchmark: 100%
Medication Reconciliation
The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.
93%243 patients4/55-star benchmark: 100%
Patient-Specific Education
The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.
8%432 patients1/55-star benchmark: 100%
Provide Patient Access
At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…
21%432 patients1/55-star benchmark: 100%
Secure Messaging
For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure…
50%432 patients3/55-star benchmark: 79%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

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

DR. RICARDO E VERDINER MD
Anesthesiology (Critical Care Medicine)
125 PATERSON ST
NEW BRUNSWICK, NJ 08901
Middlesex County (732) 235-6155
DR. IMRAN KHAN M.D., PH.D.
Internal Medicine
125 PATERSON ST, SUITE 5200
NEW BRUNSWICK, NJ 08901
Middlesex County (732) 235-6531
RUTGERS HEALTH-RWJ SCLERODERMA PROGRAM
Internal Medicine (Rheumatology)
125 PATERSON ST, SUITE 5200A
NEW BRUNSWICK, NJ 08901
Middlesex County (732) 235-7217
DOROTEA DEFRANCESCO PA
Physician Assistant (Surgical)
125 PATERSON ST, SUITE 4100
NEW BRUNSWICK, NJ 08901
Middlesex County (732) 235-7800
KRISH KHATRI M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
125 PATERSON ST
NEW BRUNSWICK, NJ 08901
Middlesex County (732) 235-7751
ADEOLA AWOMOLO MD
Obstetrics & Gynecology (Maternal & Fetal Medicine)
125 PATERSON ST
NEW BRUNSWICK, NJ 08901
Middlesex County (718) 909-4661
DR. MANISH S PATEL MD
Internal Medicine
125 PATERSON ST, ROOM 2330
NEW BRUNSWICK, NJ 08901
Middlesex County (732) 235-6539
FRANK JIANG
Internal Medicine
125 PATERSON ST, CLINICAL ACADEMIC BUILDING - SUITE 5100A
NEW BRUNSWICK, NJ 08901
Middlesex County (832) 235-6968

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 Kostis's NPI number?

The NPI number for William Kostis is 1922203439. It was assigned to this individual provider in the NPPES registry on June 15, 2007.

Where is William Kostis located?

William Kostis practices at 125 Paterson St Cab-5200, New Brunswick, NJ 08901. The listed phone number is (732) 235-6561.

What is William Kostis's specialty?

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

Is William Kostis enrolled in Medicare?

Yes. William Kostis 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 organization bills Medicare for William Kostis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Kostis reassigns Medicare benefits to Rutgers Health-Rwj Scleroderma Program (New Brunswick, 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 William Kostis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Kostis accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list William Kostis 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 Kostis affiliated with any hospitals?

According to CMS data, William Kostis is affiliated with University Medical Center Of Princeton At Plainsboro, Robert Wood Johnson University Hospital, Community Medical Center, Robert Wood Johnson University Hospital - Somerset and Robert Wood Johnson University Hospital At Hamilton.

When was this NPI record last updated?

The NPPES record for William Kostis was last updated on April 30, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.