DARREN S. O'NEILL M.D. – NPI #1861434607
Internal Medicine

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.

Health Care Provider Taxonomy Code for Internal Medicine

DARREN O'NEILL is a physician located in ENFIELD, CT. NPPES has assigned the NPI number 1861434607 to DARREN O'NEILL on June 12, 2006. It is a Type-1 NPI, indicating this NPI number is associated with an individual. The primary taxonomy selected by this provider is 207R00000X from the Health Care Provider Taxonomy code set, which is classified as Internal Medicine.

The NPI profile was last updated on May 19, 2026. Use the NPI data found here to bill health insurance companies, identify providers enrolled in Medicare and Medicaid services or other HIPAA compliant transactions. See the complete NPI profile for DARREN O'NEILL below.

NPI Profile for
DARREN S. O'NEILL

NPI Number
1861434607
Enumeration Date

(about 20 years ago)
Entity Type
Type-1  Individual (Male)
Legal Name
DARREN S. O'NEILL
Credentials
M.D.
Primary location
701 ENFIELD ST
ENFIELD, CT 06082-2961
Phone: (860) 741-6058 Fax: (413) 733-5860
Mailing address
280 CHESTNUT ST FL 2
SPRINGFIELD, MA 01199-1001
Phone: (413) 794-3909 Fax:
Sole Proprietor
No
Updated
Certification Date
May 19, 2026

Note: NPPES allows providers to attest to the accuracy of their NPI data. When a provider request any change to the NPI record, they will be able to attest to their changed NPI data, resulting in an updated certification date.

Identifiers

Identifiers for DARREN O'NEILL

Identifiers are used to associate other provider identifiers such as Medicaid or other insurers (ie:, Blue Cross, Blue Shield, Aetna, Kaiser-Permanente, etc.), with their NPI number. These identifiers can be used in matching an NPI number to an insurer's records. However, not all providers have such numbers and not all providers choose to include them in their NPI information.

See identifiers
DescriptionIssuerStateIdentifier
otherBLUE CROSS BLUE SHIELDCT010036429CT01
otherBLUE CROSS BLUE SHIELDMAJ18564
otherHEALTH NEW ENGLANDMA24085
otherTUFTS HEALTH PLANMA151285
medicaidMA3176835
Taxonomy Code(s)

A taxonomy code is a code that describes the health care service provider's type, classification, and the area of specialization. The primary specialty for this provider is indicated as (Primary) below.

Taxonomy Classification / Specialization State License
207R00000X
- Internal Medicine (Primary)		 CT 36429

The taxonomy codes are selected by the provider at the time of NPI registration. Selection of a taxonomy code does not replace any credentialing or validation process that the provider requesting the code should complete.

Additional Information

Education
UNIVERSITY OF CONNECTICUT SCHOOL OF MEDICINE - Graduated 1994
Offers Telehealth Services
Yes - Telehealth services allows you to talk to your health care provider using audio/video communications, such as Zoom, without actually going in to the doctor's office
Accepts Medicare
This provider accepts Medicare-approved amount as payment in full. The Medicare-approved amount is the total the provider can be paid. When a provider accepts the Medicare-approved amount as payment, you won't be billed for more than the Medicare deductible & coinsureance.
Medicare Ordering & Referring
Provider can:
  • Refer to Part B
  • Order Durable Medical Equipment
  • Refer to Home Health Agency
  • Order Power Mobility Devices
Affiliations
DARREN O'NEILL is affiliated with the following medical group(s):
  • HOSPITAL
    • BAYSTATE MEDICAL CENTER
      759 CHESTNUT STREET
      SPRINGFIELD, MA 01199
    • BAYSTATE NOBLE HOSPITAL
      115 WEST SILVER STREET
      WESTFIELD, MA 01085
    • JOHNSON MEMORIAL HOSPITAL
      201 CHESTNUT HILL ROAD
      STAFFORD SPRINGS, CT 06076
    • MERCY MEDICAL CTR
      271 CAREW STREET
      SPRINGFIELD, MA 01104
  • HOME HEALTH AGENCY
    • AMEDISYS HOME HEALTH CARE
      67 HUNT STREET, SUITE 100 & 117
      AGAWAM, MA 01001
    • BAYSTATE HOME HEALTH
      30 CAPITAL DRIVE, STE A
      W SPRINGFIELD, MA 01089
    • ELARA CARING
      136 BERLIN ROAD
      CROMWELL, CT 06416
    • OVERLOOK VISITING NURSE ASSOCIATION INC
      88 MASONIC ROAD
      CHARLTON, MA 01507
    • TRINITY HEALTH OF NEW ENGLAND AT HOME
      76 BATTERSON PARK ROAD
      FARMINGTON, CT 06032
  • HOSPICE
    • BAYSTATE HOME HEALTH
      30 CAPITAL DR, SUITE A
      WEST SPRINGFIELD, MA 01089

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Can I hide my NPI profile from the public?
Unfortunately, No. The NPPES discloses health care provider data under the Freedom of Information Act to the public, which means anyone may request such information directly from the National Plan & Provider Enumeration System. See the complete CMS Data Dissemination Notice here.