DARREN S O'NEILL M.D.
NPI 1861434607
Internal Medicine in Enfield, CT

Q: What is Darren O'neill's NPI number?

The NPI number for Darren O'neill is 1861434607. It was assigned to this individual provider in the NPPES registry on June 12, 2006.

Q: What is Darren O'neill's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Darren O'neill was last updated on May 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 12, 2006PECOS EnrolledAccepts Medicare Assignment

701 ENFIELD ST, ENFIELD, CT 06082(860) 741-6058(413) 733-5860 Get Directions Write a Review

NPPES record last updated: May 19, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

On this page

About Darren S O'neill M.d. NPPES

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

DARREN S O'NEILL M.D. (NPI 1861434607) is an individual internal medicine provider in Enfield, Connecticut, licensed in Connecticut (36429) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Baystate Wing Hospital, and is a graduate of University Of Connecticut School Of Medicine (1994).

NPPES Registry Identity

NPI1861434607

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDARREN S O'NEILLCredential: M.D.

Location Address701 ENFIELD STEnfield, CT 06082-2961

Mailing Address280 Chestnut St Fl 2Springfield, MA 01199-1001 · (413) 794-3909

Phone(860) 741-6058

Fax(413) 733-5860

Sole ProprietorNo

Medical School CMSUniversity Of Connecticut School Of MedicineGraduated 1994

Enumeration DateJune 12, 2006

Last NPPES UpdateMay 19, 2026

NPPES CertifiedMay 19, 2026

✔ NPI 1861434607 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Licenses✔ Licensed in CT · 36429✔ Licensed in MA · 151285

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.

701 ENFIELD ST, Enfield, CT 06082

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Other Identifiers 5

Other151285MA · Tufts Health Plan

OtherJ18564MA · Blue Cross Blue Shield

Other24085MA · Health New England

Other010036429CT01CT · Blue Cross Blue Shield

Medicaid3176835MA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.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

Darren S 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 ID9739211491

PECOS Enrollment IDI20100929001009

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

Springfield Medical Associates, Inc

7.2 mi

Multi-Specialty

2150 MAIN ST
Springfield, MA 01104

Reassigned Medicare billing, Connecticut enrollment
8 clinicians in this Medicare group

NPI 1386661148 (413) 739-5676

Baystate Medical Practices, Inc

8.2 mi

Emergency Medical Services

759 CHESTNUT ST
Springfield, MA 01199

Reassigned Medicare billing, Connecticut enrollment
7 clinicians in this Medicare group

NPI 1548205909 (413) 794-5700

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 22

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.

1,177 services631 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.

655 services375 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

371 services371 patients

Anticoagulant management of patient taking warfarin 93793

Anticoagulant management with warfarin involves monitoring and adjusting your medication to prevent blood clots while minimizing the risk of bleeding. Regular blood tests measure your response to warfarin, helping adjust your dose if necessary. It's crucial to maintain a consistent diet and promptly report any changes in your health.

279 services30 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

199 services197 patients

Influenza vaccine split virus, preservative free 90662

The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.

183 services182 patients

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301

Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.

181 services35 patients

Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677

The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.

150 services149 patients

Administration of pneumococcal vaccine G0009

The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.

149 services148 patients

Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and G0180

This is a service where a doctor or authorized practitioner certifies that you require Medicare-covered home health services. They will communicate with the home health agency and review reports on your health status to ensure you receive appropriate care. This does not involve an in-person visit.

106 services71 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.

80 services75 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

75 services12 patients

Transitional care management services for problem of high complexity 99496

Transitional care management services are designed to ensure a smooth transition from a hospital to home or another care setting for patients with complex health issues. These services include medication management, patient education, and coordination with healthcare providers.

75 services60 patients

Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg J3420

This is a procedure where a small dose of Vitamin B-12, also known as Cyanocobalamin, is injected into your body. This vitamin is essential for nerve function and the production of red blood cells. It's often used to treat vitamin B-12 deficiency.

75 services12 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

64 services40 patients

Telephone medical discussion with physician, 5-10 minutes 99441

A telephone medical discussion with a physician is a brief, 5-10 minute call where you can discuss your health concerns. It's a convenient way to receive medical advice without needing to visit a clinic. It's important to prepare questions in advance to make the most of this time.

44 services42 patients

Physician or allowed practitioner re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians a G0179

This procedure involves a doctor or approved practitioner reviewing your health status and re-certifying your need for Medicare-covered home health services. It includes communication with the home health agency and assessment of your health reports, even when you're not physically present.

35 services15 patients

Removal of impacted ear wax 69210

Impacted ear wax removal is a safe procedure to clear blockages in the ear canal caused by hardened ear wax. A healthcare professional uses specialized tools or a gentle irrigation method to loosen and remove the wax, improving hearing and alleviating discomfort.

33 services31 patients

Telephone medical discussion with physician, 11-20 minutes 99442

This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.

26 services25 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

24 services23 patients

Transitional care management services for problem of at least moderate complexity 99495

Transitional care management services focus on coordinating and managing your care after you leave the hospital. For moderate complexity problems, this involves managing your medications, arranging further treatments, and ensuring you have the necessary follow-ups.

20 services17 patients

Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional 99211

This service involves an outpatient visit for established patients who may not need direct interaction with a healthcare professional. It could include reviewing test results, monitoring existing conditions, or adjusting treatment plans. It's typically done remotely, ensuring your comfort and convenience.

15 services15 patients

Hospital Affiliations CMS Care Compare 4

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

Baystate Wing Hospital

Acute Care Hospitals · Palmer, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number220030

Location40 Wright StreetPalmer, MA 01069 · Hampden County

Emergency services

Baystate Noble Hospital

Acute Care Hospitals · Westfield, MA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220065

Location115 West Silver StreetWestfield, MA 01085 · Hampden County

Emergency services

Mercy Medical Ctr

Acute Care Hospitals · Springfield, MA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220066

Location271 Carew StreetSpringfield, MA 01104 · Hampden County

Emergency services Birthing friendly

Baystate Medical Center

Acute Care Hospitals · Springfield, MA

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220077

Location759 Chestnut StreetSpringfield, MA 01199 · Hampden County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06082 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

$138.84 typical visit price

range $60.82 – $183.10

Typical copayment $34.71 (range $15.20 – $45.77)

Most-billed visit code 99204

Established Patient

$106.68 typical visit price

range $19.76 – $149.26

Typical copayment $26.67 (range $4.94 – $37.31)

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.

Referred Medical Equipment & Supplies CMS DME claims 23

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

19 suppliers62 claims172 services$6.30 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

11 suppliers29 claims39 services$1.04 avg. paid by Medicare

Tubing with integrated heating element for use with positive airway pressure device A4604

DME-Other DME · category DE001N

8 suppliers33 claims33 services$33.88 avg. paid by Medicare

Administration set, with small volume nonfiltered pneumatic nebulizer, disposable A7003

DME-Other DME · category DE000N

2 suppliers11 claims22 services$0.93 avg. paid by Medicare

Full face mask used with positive airway pressure device, each A7030

DME-Other DME · category DE001N

8 suppliers33 claims33 services$76.81 avg. paid by Medicare

Face mask interface, replacement for full face mask, each A7031

DME-Other DME · category DE001N

8 suppliers33 claims88 services$29.94 avg. paid by Medicare

Cushion for use on nasal mask interface, replacement only, each A7032

DME-Other DME · category DE001N

4 suppliers15 claims69 services$15.84 avg. paid by Medicare

Pillow for use on nasal cannula type interface, replacement only, pair A7033

DME-Other DME · category DE001N

5 suppliers17 claims95 services$12.64 avg. paid by Medicare

Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap A7034

DME-Other DME · category DE001N

4 suppliers20 claims20 services$46.84 avg. paid by Medicare

Headgear used with positive airway pressure device A7035

DME-Other DME · category DE001N

8 suppliers35 claims35 services$16.06 avg. paid by Medicare

Tubing used with positive airway pressure device A7037

DME-Other DME · category DE001N

4 suppliers30 claims30 services$10.36 avg. paid by Medicare

Filter, disposable, used with positive airway pressure device A7038

DME-Other DME · category DE001N

9 suppliers53 claims306 services$1.94 avg. paid by Medicare

Water chamber for humidifier, used with positive airway pressure device, replacement, each A7046

DME-Other DME · category DE001N

9 suppliers34 claims34 services$11.25 avg. paid by Medicare

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

3 suppliers27 claims27 services$13.69 avg. paid by Medicare

Nebulizer, with compressor E0570

DME-Other DME · category DE000N

1 supplier16 claims16 services$2.16 avg. paid by Medicare

Continuous positive airway pressure (cpap) device E0601

DME-Other DME · category DE001N

5 suppliers45 claims45 services$24.46 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

6 suppliers69 claims69 services$64.83 avg. paid by Medicare

Arformoterol, inhalation solution, fda approved final product, non-compounded, administered through dme, unit dose form, 15 micrograms J7605

DME-Drugs Administered Through DME · category DG006N

1 supplier12 claims720 services$4.41 avg. paid by Medicare

Albuterol, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose, 1 mg J7613

DME-Drugs Administered Through DME · category DG006N

5 suppliers20 claims4,014 services$0.03 avg. paid by Medicare

Budesonide, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, up to 0.5 mg J7626

DME-Drugs Administered Through DME · category DG000N

2 suppliers13 claims900 services$0.83 avg. paid by Medicare

Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553

DME-Other DME · category DE017N

3 suppliers18 claims18 services$189.44 avg. paid by Medicare

Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738

DME-Oxygen and Supplies · category DC000N

2 suppliers14 claims14 services$35.50 avg. paid by Medicare

Pharmacy dispensing fee for inhalation drug(s); per 30 days Q0513

DME-Other DME · category DE000N

5 suppliers33 claims33 services$22.90 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 14

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

SPINE DYNAMICS, INC.

Chiropractor

701 ENFIELD ST, SUITE 170
ENFIELD, CT 06082

Capitol Planning Region (860) 741-2187

KARA MARIE SAWYER MSN, NP-C

Nurse Practitioner

701 ENFIELD ST
ENFIELD, CT 06082

Capitol Planning Region (860) 741-6058

JULIE M WONDOLOWSKI PA-C

Physician Assistant (Medical)

701 ENFIELD ST
ENFIELD, CT 06082

Capitol Planning Region (860) 741-6058

KAITLIN G. PULITO P.A.-C

Physician Assistant (Medical)

701 ENFIELD ST
ENFIELD, CT 06082

Capitol Planning Region (860) 741-6058

CAILYN EVE BOLDUC PA-C

Physician Assistant (Medical)

701 ENFIELD ST
ENFIELD, CT 06082

Capitol Planning Region (860) 741-6058

MS. KAREN L KRUSTAPENTUS APRN, BC

Nurse Practitioner

701 ENFIELD ST, SPRINGFIELD MEDICAL ASSOCIATES
ENFIELD, CT 06082

Capitol Planning Region (860) 741-6058

ROSEMARIE THOMPSON, RD

Dietitian, Registered

701 ENFIELD ST, SUITE 202
ENFIELD, CT 06082

Capitol Planning Region (860) 741-3222

ROSEMARIE THOMPSON RD

Dietitian, Registered

701 ENFIELD ST, SUITE 202
ENFIELD, CT 06082

Capitol Planning Region (860) 741-3222

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 Darren O'neill's NPI number?

The NPI number for Darren O'neill is 1861434607. It was assigned to this individual provider in the NPPES registry on June 12, 2006.

Where is Darren O'neill located?

Darren O'neill practices at 701 Enfield St, Enfield, CT 06082. The listed phone number is (860) 741-6058.

What is Darren O'neill's specialty?

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

Is Darren O'neill enrolled in Medicare?

Yes. Darren 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.

Which organizations bill Medicare for Darren O'neill's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Darren O'neill reassigns Medicare benefits to 2 organizations: Springfield Medical Associates, Inc (Springfield, MA) and Baystate Medical Practices, Inc (Springfield, 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 Darren O'neill's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Darren O'neill accept?

Health plans from Anthem Blue Cross and Blue Shield list Darren O'neill 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 Darren O'neill affiliated with any hospitals?

According to CMS data, Darren O'neill is affiliated with Baystate Wing Hospital, Baystate Noble Hospital, Mercy Medical Ctr and Baystate Medical Center.

When was this NPI record last updated?

The NPPES record for Darren O'neill was last updated on May 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.