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DR. MARY DERRANE MD
NPI 1366637084
Emergency Medicine in New Milford, CT

Active since September 06, 2007PECOS Enrolled
21 ELM STREET, NEW MILFORD, CT 06776(860) 350-7222 Get Directions Write a Review

NPPES record last updated: August 8, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Mary Derrane Md NPPES

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

DR. MARY DERRANE MD (NPI 1366637084) is an individual emergency medicine provider in New Milford, Connecticut, licensed in Connecticut (045768) and active in the NPI registry since September 2007. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1366637084
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDR. MARY DERRANECredential: MD
Location Address21 ELM STREETNew Milford, CT 06776
Mailing Address21 Elm StreetNew Milford, CT 06776 · (860) 350-7222
Phone(860) 350-7222
Sole ProprietorYes
Enumeration DateSeptember 6, 2007
Last NPPES UpdateAugust 8, 2025
NPPES CertifiedAugust 8, 2025
✔ NPI 1366637084 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in CT · 045768✔ Licensed in NY · 243200
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.
21 ELM STREET, New Milford, CT 06776
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Other Names 1

Former Name (1)Dr. Mary Mackessy Md

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mary Derrane Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 3

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 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.
59 services57 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.
36 services36 patients
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.
32 services32 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06776 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 2

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

MICHELE LEE MACDONNELL R.D.
Dietitian, Registered
21 ELM STREET, NEW MILFORD HOSPITAL
NEW MILFORD, CT 06776
Western Connecticut Planning Region (860) 350-7289
HEATHER GWEN MILLIGAN R.D.
Dietitian, Registered
21 ELM STREET, NEW MILFORD HOSPITAL
NEW MILFORD, CT 06776
Western Connecticut Planning Region (860) 350-7289

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 Derrane's NPI number?

The NPI number for Mary Derrane is 1366637084. It was assigned to this individual provider in the NPPES registry on September 6, 2007. The provider is also known as Dr. Mary Mackessy MD.

Where is Mary Derrane located?

Mary Derrane practices at 21 Elm Street, New Milford, CT 06776. The listed phone number is (860) 350-7222.

What is Mary Derrane's specialty?

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

Is Mary Derrane enrolled in Medicare?

Yes. Mary Derrane is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mary Derrane was last updated on August 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.