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DIA O'BRIEN APRN
NPI 1750168951
Nurse Practitioner - Psychiatric/Mental Health in New Haven, CT

Active since September 11, 2023PECOS EnrolledAccepts Medicare Assignment
34 PARK ST, NEW HAVEN, CT 06519(203) 974-7560 Get Directions Write a Review

NPPES record last updated: September 11, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dia O'brien Aprn NPPES

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

DIA O'BRIEN APRN (NPI 1750168951) is an individual psychiatric/mental health provider in New Haven, Connecticut, licensed in Connecticut (12121) and active in the NPI registry since September 2023. She is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1750168951
Entity TypeIndividualFemale
Primary Taxonomy363LP0808X
Provider Legal NameDIA O'BRIENCredential: APRN
Location Address34 PARK STNew Haven, CT 06519-1109
Mailing Address185 Patterson StTorrington, CT 06790-5536 · (860) 491-6577
Phone(203) 974-7560
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateSeptember 11, 2023
NPPES CertifiedSeptember 11, 2023
✔ NPI 1750168951 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0808X
License✔ Licensed in CT · 12121
34 PARK ST, New Haven, CT 06519
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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

Dia O'brien Aprn 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 ID1456796424
PECOS Enrollment IDI20240229001174
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

2

Medicare enrollment records show Dia O'brien reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Charlotte Hungerford Hospital
35 mi
General Acute Care Hospital
540 LITCHFIELD ST
Torrington, CT 06790
  • Reassigned Medicare billing, Connecticut enrollment
  • 374 clinicians in this Medicare group
NPI 1629075734 (860) 496-6729
State Of Connecticut
50 mi
Magnetic Resonance Imaging (MRI)
850 BOLTON RD UNIT 1271
Storrs, CT 06269
  • Reassigned Medicare billing, Connecticut enrollment
  • 186 clinicians in this Medicare group
NPI 1871095851 (860) 486-3108

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06519 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
$93.86 typical visit price
range $60.82 – $183.10
Typical copayment $23.46 (range $15.20 – $45.77)
Most-billed visit code 99203
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.

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.

CELESTE ERIKA VALENCIA M.D.
Psychiatry & Neurology (Psychiatry)
34 PARK ST
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-7158
JEANNE LAURA STEINER DO
Psychiatry & Neurology (Psychiatry)
34 PARK ST, CONNECTICUT MENTAL HEALTH CENTER
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-7417
DR. JOHN R SAKSA PSY.D.
Psychologist (Clinical)
34 PARK ST, RM. B-38
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-7043
DR. VINOD H SRIHARI MD
Psychiatry & Neurology (Psychiatry)
34 PARK ST, CONNECTICUT MENTAL HEALTH CENTER
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-7417
JO R KREMER MD
Psychiatry & Neurology (Psychiatry)
34 PARK ST, CONNECTICUT MENTAL HEALTH CENTER
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-7417
ANDREA PATRICIA MENDIOLA IPARRAGUIRRE
Student in an Organized Health Care Education/Training Program
34 PARK ST
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (475) 217-6217
PAYAL KHENGAR
Student in an Organized Health Care Education/Training Program
34 PARK ST
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-5777
MRS. NANCY ELIZABETH WATSKY APRN
Nurse Practitioner (Psychiatric/Mental Health)
34 PARK ST, CONNECTICUT MENTAL HEALTH CENTER
NEW HAVEN, CT 06519
South Central Connecticut Planning Region (203) 974-7417

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 Dia O'brien's NPI number?

The NPI number for Dia O'brien is 1750168951. It was assigned to this individual provider in the NPPES registry on September 11, 2023.

Where is Dia O'brien located?

Dia O'brien practices at 34 Park St, New Haven, CT 06519. The listed phone number is (203) 974-7560.

What is Dia O'brien's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Is Dia O'brien enrolled in Medicare?

Yes. Dia O'brien 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 Dia O'brien's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Dia O'brien reassigns Medicare benefits to 2 organizations: The Charlotte Hungerford Hospital (Torrington, CT) and State Of Connecticut (Storrs, CT). 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 Dia O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Dia O'brien was last updated on September 11, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.