JOHN J. O'CONNOR JR. M.D.
NPI 1295988921
Anesthesiology in Worcester, MA

Q: What is John O'connor's NPI number?

The NPI number for John O'connor is 1295988921. It was assigned to this individual provider in the NPPES registry on October 26, 2008.

Q: What is John O'connor's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Q: When was this NPI record last updated?

The NPPES record for John O'connor was last updated on October 8, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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 October 26, 2008PECOS EnrolledAccepts Medicare Assignment

82.78/100

CMS Quality Rating

55 LAKE AVE N, DEPARTMENT OF ANESTHESIOLOGY, WORCESTER, MA 01655(508) 334-3271(508) 856-5911 Get Directions Write a Review

NPPES record last updated: October 8, 2009. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About John J. O'connor Jr. M.d. NPPES

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

JOHN J. O'CONNOR JR. M.D. (NPI 1295988921) is an individual anesthesiology provider in Worcester, Massachusetts, licensed in Massachusetts (238964) and active in the NPI registry since October 2008. He is enrolled in Medicare PECOS, is affiliated with South Shore Hospital, and is a graduate of Other (2005).

NPPES Registry Identity

NPI1295988921

Entity TypeIndividualMale

Primary Taxonomy207L00000X

Provider Legal NameJOHN J. O'CONNOR JR.Credential: M.D.

Location Address55 LAKE AVE N, DEPARTMENT OF ANESTHESIOLOGYWorcester, MA 01655-0002

Mailing AddressPo Box 415348Boston, MA 02241-5348

Phone(508) 334-3271

Fax(508) 856-5911

Sole ProprietorNo

Medical School CMSOtherGraduated 2005

Enumeration DateOctober 26, 2008

Last NPPES UpdateOctober 8, 2009

✔ NPI 1295988921 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207L00000X

License✔ Licensed in MA · 238964

Definition

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

55 LAKE AVE N, Worcester, MA 01655

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Other Identifiers 2

Medicaid110082046AMA

Medicare PIN001174701MA

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

John J. O'connor Jr. 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 ID3779637780

PECOS Enrollment IDI20090810000601

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 John O'connor reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Coastal Medical Associates

42 mi

Anesthesiology

55 FOGG RD
Weymouth, MA 02190

Reassigned Medicare billing, Massachusetts enrollment
671 clinicians in this Medicare group

NPI 1932175684 (781) 340-4293

South Suburban Gastroenterology, PC

42 mi

Gastroenterology

1085 MAIN ST
South Weymouth, MA 02190

Reassigned Medicare billing, Massachusetts enrollment
93 clinicians in this Medicare group

NPI 1114948478 (781) 331-2922

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 19

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.

Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand 01810

Anesthesia for procedures on the forearm, wrist, and hand involves administering medication to block sensation in these areas. This helps ensure comfort and painlessness during surgeries or treatments involving nerves, muscles, tendons, and tissue in these regions.

62 services61 patients

Ultrasonic guidance for needle placement 76942

Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.

40 services40 patients

Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) 64415

This procedure involves injecting a numbing agent or steroid into your arm's nerve bundle. It's done to manage pain or inflammation. The injection helps block nerve signals that cause discomfort, providing relief. It's a safe, common procedure.

25 services25 patients

Anesthesia for retinal surgery 00145

Anesthesia for retinal surgery involves using medications to numb your eye and surrounding area. This prevents pain and discomfort during the procedure. You may also receive medication to help you relax. The anesthesia can be local (just your eye) or general (you're asleep).

24 services24 patients

Anesthesia for procedure for total knee joint replacement 01402

Anesthesia for a total knee joint replacement numbs your body to eliminate pain during surgery. This could be general anesthesia where you're unconscious, or regional anesthesia where only the leg is numb. It's administered by a specialist, ensuring safety and comfort.

22 services22 patients

Anesthesia for other procedure on top of arm bone and shoulder joint 01630

Anesthesia for a procedure on the arm bone or shoulder joint involves using medication to numb the area or make you unconscious during surgery. This ensures you feel no pain during the procedure. It's a common and safe practice in medical surgeries.

21 services21 patients

Anesthesia for other procedure or exam of knee joint using an endoscope 01400

Anesthesia for a knee joint procedure or exam using an endoscope involves administering medication to numb the area or put you in a sleep-like state. This ensures you don't feel pain during the procedure. The endoscope, a thin tube with a camera, allows the doctor to view the knee joint internally without making large incisions.

18 services18 patients

Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) 64447

This procedure involves injecting a numbing agent and/or steroid into a nerve in your thigh. It's done to alleviate pain or inflammation. A needle will be carefully positioned near the nerve, and the medicine will be administered.

18 services18 patients

Anesthesia for procedure on anus and rectum 00902

Anesthesia for procedures on the anus and rectum ensures comfort during medical procedures. It involves the administration of medication to numb the area or induce sleep, so you don't feel pain or discomfort. This helps doctors perform necessary procedures smoothly and effectively.

16 services16 patients

Anesthesia for other procedure on lower leg, ankle, and foot bones 01480

Anesthesia for procedures on lower leg, ankle, and foot bones involves administering medication to block pain and sensation in these areas. This allows doctors to perform necessary treatments or surgeries without causing discomfort. The type of anesthesia used can vary based on the specific procedure.

16 services15 patients

Anesthesia for other procedure on forearm, wrist, or hand bones 01830

Anesthesia for procedures on forearm, wrist, or hand bones involves administering medications to block sensation in the specific area. It ensures you don't feel pain during the procedure. It can be local (numbing a small area) or regional (numbing a larger part of the body).

16 services16 patients

Anesthesia for other procedure on upper abdomen 00790

Anesthesia for an upper abdomen procedure involves using medications to help you feel no pain during the operation. It can be general, where you're unconscious, or regional, where just the abdomen area is numbed. It ensures comfort and stillness, aiding a successful procedure.

14 services14 patients

Anesthesia for x-ray or radiation therapy 01922

Anesthesia for x-ray or radiation therapy involves administering medication to help you relax or sleep during the procedure. It's used to ensure comfort, minimize movement, and reduce anxiety. The type of anesthesia used depends on the procedure and patient's health.

14 services14 patients

Insertion of artery tube for blood sampling or infusion through skin 36620

This procedure involves placing a small tube into an artery, usually in the wrist or elbow, to collect blood samples or administer medication. It's done under local anesthesia and is a common, safe practice.

13 services11 patients

Anesthesia for total hip replacement 01214

Anesthesia for total hip replacement is a medical service where medication is given to eliminate pain during surgery. Two types are commonly used: general anesthesia, making you unconscious, or spinal anesthesia, numbing the lower body. The choice depends on your health and your doctor's recommendation.

12 services12 patients

Anesthesia for procedure on upper 2/3rd of thigh bone 01230

Anesthesia for a procedure on the upper 2/3rd of the thigh bone involves administering medication to numb the area or make you unconscious, ensuring you don't feel pain during the operation. It's a safe and routine part of surgical procedures.

12 services12 patients

Anesthesia for other procedure on skin of arms, legs, and front body 00400

Anesthesia for procedures on the skin of your arms, legs, and front body is a service that numbs the area being treated. This ensures you don't feel pain during procedures like biopsies, stitches, or minor surgeries. It's administered through a small injection or a topical cream.

11 services11 patients

Anesthesia for other procedure on lower abdomen 00840

Anesthesia for a lower abdomen procedure involves medication to eliminate pain during surgery. You might be awake but relaxed and pain-free, or you may be completely unconscious. It's administered to ensure comfort and safety throughout the operation.

11 services11 patients

Anesthesia for other procedure on urinary system through urethra 00910

Anesthesia for a procedure on the urinary system through the urethra involves using medicine to numb sensation in the area. This is done to ensure you feel no pain or discomfort during the procedure. The medicine can be given locally, regionally, or generally, depending on the specifics of your procedure.

11 services11 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

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.

HILLARY R. IRONS MD

Emergency Medicine

55 LAKE AVE N
WORCESTER, MA 01655

Worcester County (508) 421-1400

MS. EILEEN A. DUHAMEL NP

Nurse Practitioner

55 LAKE AVE N, DEPARTMENT OF RADIOLOGY
WORCESTER, MA 01655

Worcester County (508) 334-2710

EWA HRYNISZYN CRNA

Nurse Anesthetist, Certified Registered

55 LAKE AVE N, DEPARTMENT OF ANESTHESIOLOGY
WORCESTER, MA 01655

Worcester County (508) 334-3271

HELEN COPSEY PA-C

Physician Assistant

55 LAKE AVE N
WORCESTER, MA 01655

Worcester County (508) 334-8585

DR. ADEPEJU GBADEBO CHAMPION M.D.

Internal Medicine

55 LAKE AVE N
WORCESTER, MA 01655

Worcester County (508) 334-2731

SOWMYA KORAPATI

Internal Medicine (Hematology & Oncology)

55 LAKE AVE N
WORCESTER, MA 01655

Worcester County (508) 334-3550

LAYLA FAKHRZADEH M.D.

Anesthesiology

55 LAKE AVE N, ANESTHESIOLOGY
WORCESTER, MA 01655

Worcester County (508) 334-3271

YOONYIE CHO M.D.

Anesthesiology

55 LAKE AVE N
WORCESTER, MA 01655

Worcester County (508) 334-1000

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 John O'connor's NPI number?

The NPI number for John O'connor is 1295988921. It was assigned to this individual provider in the NPPES registry on October 26, 2008.

Where is John O'connor located?

John O'connor practices at 55 Lake Ave N Department Of Anesthesiology, Worcester, MA 01655. The listed phone number is (508) 334-3271.

What is John O'connor's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is John O'connor enrolled in Medicare?

Yes. John O'connor 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 John O'connor's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John O'connor reassigns Medicare benefits to 2 organizations: Coastal Medical Associates (Weymouth, MA) and South Suburban Gastroenterology, PC (South Weymouth, MA). 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 John O'connor's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is John O'connor affiliated with any hospitals?

According to CMS data, John O'connor is affiliated with South Shore Hospital.

When was this NPI record last updated?

The NPPES record for John O'connor was last updated on October 8, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.