WILLIAM W. TOLLEFSEN MD
NPI 1841462876
Emergency Medicine in Worcester, MA

Q: What is William Tollefsen's NPI number?

The NPI number for William Tollefsen is 1841462876. It was assigned to this individual provider in the NPPES registry on March 31, 2008.

Q: What is William Tollefsen's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Q: When was this NPI record last updated?

The NPPES record for William Tollefsen was last updated on November 13, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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 March 31, 2008PECOS EnrolledAccepts Medicare Assignment

82.78/100

CMS Quality Rating

119 BELMONT ST, DEPARTMENT OF EMERGENCY MEDICINE, WORCESTER, MA 01605(508) 421-1400(508) 421-1490 Get Directions Write a Review

NPPES record last updated: November 13, 2012. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About William W. Tollefsen Md NPPES

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

WILLIAM W. TOLLEFSEN MD (NPI 1841462876) is an individual emergency medicine provider in Worcester, Massachusetts, licensed in Massachusetts (243758) and active in the NPI registry since March 2008. He is enrolled in Medicare PECOS, is affiliated with South Shore Hospital, and is a graduate of New York Medical College (2008).

NPPES Registry Identity

NPI1841462876

Entity TypeIndividualMale

Primary Taxonomy207P00000X

Provider Legal NameWILLIAM W. TOLLEFSENCredential: MD

Location Address119 BELMONT ST, DEPARTMENT OF EMERGENCY MEDICINEWorcester, MA 01605-2903

Mailing AddressPo Box 415348Boston, MA 02241-5348

Phone(508) 421-1400

Fax(508) 421-1490

Sole ProprietorNo

Medical School CMSNew York Medical CollegeGraduated 2008

Enumeration DateMarch 31, 2008

Last NPPES UpdateNovember 13, 2012

✔ NPI 1841462876 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

License✔ Licensed in MA · 243758

Definition

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

119 BELMONT ST, Worcester, MA 01605

Open in Google Maps ↗

Other Identifiers 2

Medicaid110091833AMA

Medicare PIN002792603MA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William W. Tollefsen 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 ID3870741127

PECOS Enrollment IDI20120912000310

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.

Areas of Expertise CMS Part B claims 9

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.

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

136 services135 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.

64 services53 patients

Emergency department visit with moderate level of medical decision making 99284

An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.

43 services43 patients

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

24 services24 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.

23 services23 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.

20 services20 patients

Hospital Affiliations CMS Care Compare

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

South Shore Hospital

Acute Care Hospitals · South Weymouth, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220100

Location55 Fogg RoadSouth Weymouth, MA 02190 · Norfolk County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01605 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

$90.70 typical visit price

range $58.86 – $177.36

Typical copayment $22.67 (range $14.71 – $44.34)

Most-billed visit code 99203

Established Patient

$103.48 typical visit price

range $19.11 – $144.84

Typical copayment $25.87 (range $4.77 – $36.21)

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.

82.78/100

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

Scored as part of a group practice

Quality

88.33

Promoting Interoperability

Improvement Activities

Cost

69.53

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. PANKAJ ANIL KSHEERSAGAR M.B.B.S.,M.D

Family Medicine