DR. MARY JOAN O'NEILL M.D.
NPI 1861431959
Emergency Medicine in Milford, MA

Q: What is Mary Joan O'neill's NPI number?

The NPI number for Mary Joan O'neill is 1861431959. It was assigned to this individual provider in the NPPES registry on June 5, 2006.

Q: What is Mary Joan O'neill'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 Mary Joan O'neill was last updated on September 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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 June 05, 2006PECOS EnrolledAccepts Medicare Assignment

100/100

CMS Quality Rating

14 PROSPECT ST, MILFORD, MA 01757(508) 422-2810(508) 634-3276 Get Directions Write a Review

NPPES record last updated: September 8, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

On this page

About Dr. Mary Joan O'neill M.d. NPPES

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

DR. MARY JOAN O'NEILL M.D. (NPI 1861431959) is an individual emergency medicine provider in Milford, Massachusetts, licensed in Massachusetts (152946) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS, is affiliated with Milford Regional Medical Center, and is a graduate of University Of Massachusetts Medical School (1994).

NPPES Registry Identity

NPI1861431959

Entity TypeIndividualFemale

Primary Taxonomy207P00000X

Provider Legal NameDR. MARY JOAN O'NEILLCredential: M.D.

Location Address14 PROSPECT STMilford, MA 01757-3003

Mailing Address300 Longwood AveBoston, MA 02115-5724 · (617) 355-6000

Phone(508) 422-2810

Fax(508) 634-3276

Sole ProprietorNo

Medical School CMSUniversity Of Massachusetts Medical SchoolGraduated 1994

Enumeration DateJune 5, 2006

Last NPPES UpdateSeptember 8, 2025

NPPES CertifiedSeptember 8, 2025

✔ NPI 1861431959 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

License✔ Licensed in MA · 152946

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.

Also ListedPediatrics · Pediatric Emergency MedicineTaxonomy 2080P0204X · License 152946 (MA)

Other Identifiers 9

Other0008333Nhp

Other34623Fallon

OtherJ18057Blue Cross Blue Shield

Other999541Network Health

Other000000021079Bmc Healthnet

Other613214Harvard Pilgrim Health Care

Other930104656Railroad Medicare

Other152946Tufts

Medicaid3172155MA

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

Dr. Mary Joan O'neill 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 ID4688750102

PECOS Enrollment IDI20080325000201

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 4

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.

238 services228 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.

56 services56 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.

23 services22 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.

14 services14 patients

Hospital Affiliations CMS Care Compare

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

Milford Regional Medical Center

Acute Care Hospitals · Milford, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number220090

Location14 Prospect StreetMilford, MA 01757 · Worcester County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01757 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.

100/100

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

Scored as part of a group practice

Quality

100

Improvement Activities

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. SETH WAKEFIELD MD

Internal Medicine

14 PROSPECT ST
MILFORD, MA 01757

Worcester County (508) 473-1190

SONIA MCCARTHY RD, LDN

Dietitian, Registered (Nutrition, Obesity and Weight Management)

14 PROSPECT ST
MILFORD, MA 01757

Worcester County (508) 473-1190

MONA S KADDIS M.D.

Internal Medicine (Hematology & Oncology)

14 PROSPECT ST, 2ND FLOOR
MILFORD, MA 01757

Worcester County (508) 478-2061

VERA HERNANDEZ-HOLMES PA-C, RD

Physician Assistant (Medical)

14 PROSPECT ST
MILFORD, MA 01757

Worcester County (508) 473-1190

MR. MONZOLESSO JOEL BAGAH-KOGNAGBA MD

Internal Medicine

14 PROSPECT ST
MILFORD, MA 01757

Worcester County (508) 473-1190

ADALIA JUN-O'CONNELL M.D.

Psychiatry & Neurology (Vascular Neurology)

14 PROSPECT ST
MILFORD, MA 01757

Worcester County (508) 381-5016

MAURA JEAN EATON PT, DPT

Physical Therapist

14 PROSPECT ST
MILFORD, MA 01757

Worcester County (508) 442-2552

MILFORD IMAGING, INC.

Specialist

14 PROSPECT ST, DEPARTMENT OF RADIOLOGY
MILFORD, MA 01757

Worcester County (508) 422-2922

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 Mary Joan O'neill's NPI number?

The NPI number for Mary Joan O'neill is 1861431959. It was assigned to this individual provider in the NPPES registry on June 5, 2006.

Where is Mary Joan O'neill located?

Mary Joan O'neill practices at 14 Prospect St, Milford, MA 01757. The listed phone number is (508) 422-2810.

What is Mary Joan O'neill's specialty?

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

Is Mary Joan O'neill enrolled in Medicare?

Yes. Mary Joan O'neill 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.

Is Mary Joan O'neill affiliated with any hospitals?

According to CMS data, Mary Joan O'neill is affiliated with Milford Regional Medical Center.

When was this NPI record last updated?

The NPPES record for Mary Joan O'neill was last updated on September 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.