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RYAN O'HALLORAN MD, MS
NPI 1396107488
Emergency Medicine in White Plains, NY

Active since March 28, 2016PECOS EnrolledAccepts Medicare Assignment
41 E POST RD, WHITE PLAINS, NY 10601(914) 681-1158 Get Directions Write a Review

NPPES record last updated: March 9, 2023. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Mar 9, 2023, Feb 6, 2023, Jul 23, 2020 and 1 more (4 updates tracked since 2016).

About Ryan O'halloran Md, Ms NPPES

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

RYAN O'HALLORAN MD, MS (NPI 1396107488) is an individual emergency medicine provider in White Plains, New York, licensed in New York (299876) and active in the NPI registry since March 2016. He is enrolled in Medicare PECOS, is affiliated with Montefiore New Rochelle Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1396107488
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameRYAN O'HALLORANCredential: MD, MS
Location Address41 E POST RDWhite Plains, NY 10601
Mailing Address41 E Post RdWhite Plains, NY 10601-4699 · (914) 681-1158
Phone(914) 681-1158
Sole ProprietorYes
Medical School CMSOtherGraduated 2016
Enumeration DateMarch 28, 2016
Last NPPES UpdateMarch 9, 20234 updates tracked since enumeration
NPPES CertifiedMarch 9, 2023
✔ NPI 1396107488 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in NY · 299876
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.
41 E POST RD, White Plains, NY 10601
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Secondary Practice Locations 2

Location 17901 BroadwayElmhurst, NY 11373 · Phone (718) 334-3050
Location 21 Gustave L Levy Pl # 1149New York, NY 10029-6504 · Phone (212) 824-8069 · Fax (212) 241-1279

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

Ryan O'halloran Md, Ms 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 ID2365788866
PECOS Enrollment IDI20200706000459
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

3

Medicare enrollment records show Ryan O'halloran reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

East Post Road Medical Services PC
Same address
Emergency Medicine
41 E POST RD
White Plains, NY 10601
  • Reassigned Medicare billing, New York enrollment
  • 479 clinicians in this Medicare group
NPI 1841767274 (914) 681-1210
Downtown Bronx Medical Associates PC
17 mi
Emergency Medical Services
234 E 149TH ST, STE 8D200
Bronx, NY 10451
  • Reassigned Medicare billing, New York enrollment
  • 971 clinicians in this Medicare group
NPI 1689618407 (718) 576-6200
Icahn School Of Medicine At Mount Sinai
20 mi
Anesthesiology
7901 BROADWAY
Elmhurst, NY 11373
  • Reassigned Medicare billing, New York enrollment
  • 836 clinicians in this Medicare group
NPI 1063766038 (718) 334-1591

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 6

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.
271 services257 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.
210 services208 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
55 services54 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
53 services51 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
48 services48 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.
43 services43 patients

Hospital Affiliations CMS Care Compare 2

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

Montefiore New Rochelle Hospital

Acute Care Hospitals · New Rochelle, NY
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330184
Location16 Guion PlaceNew Rochelle, NY 10802 · Westchester County
Emergency services Birthing friendly

White Plains Hospital Center

Acute Care Hospitals · White Plains, NY
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330304
Location41 East Post R0adWhite Plains, NY 10601 · Westchester County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10601 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
$105.06 typical visit price
range $67.40 – $203.53
Typical copayment $26.26 (range $16.85 – $50.88)
Most-billed visit code 99203
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
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.

WHITE PLAINS CARDIOLOGY AND NEUROLOGY ASSOCIATES,P.C.
Specialist
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 948-3630
WEILL MEDICAL COLLEGE OF CORNELL UNIVERSITY
Internal Medicine (Cardiovascular Disease)
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 681-0600
MR. OBIOMA GODSWILL ATUFUNWA PA
Physician Assistant
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 681-0600
SAAD MOHAMMAD MD
Anesthesiology
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 681-2663
DR. KENWARD YUE M.D.
Anesthesiology
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 681-0600
JOSEPHINE CASH
Nurse Anesthetist, Certified Registered
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 681-0600
ISABELLA MARTYNA CHOJNACKI MD
Internal Medicine
41 E POST RD
WHITE PLAINS, NY 10601
Westchester County (914) 681-0600
DR. SHARON D NEEMAN M.D.
Psychiatry & Neurology (Psychiatry)
41 E POST RD, DEPARTMET OF BEHAVIORAL HEALTH
WHITE PLAINS, NY 10601
Westchester County (914) 681-2573

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 Ryan O'halloran's NPI number?

The NPI number for Ryan O'halloran is 1396107488. It was assigned to this individual provider in the NPPES registry on March 28, 2016.

Where is Ryan O'halloran located?

Ryan O'halloran practices at 41 E Post Rd, White Plains, NY 10601. The listed phone number is (914) 681-1158.

What is Ryan O'halloran's specialty?

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

Is Ryan O'halloran enrolled in Medicare?

Yes. Ryan O'halloran 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 Ryan O'halloran's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ryan O'halloran reassigns Medicare benefits to 3 organizations: East Post Road Medical Services PC (White Plains, NY), Downtown Bronx Medical Associates PC (Bronx, NY) and Icahn School Of Medicine At Mount Sinai (Elmhurst, NY). 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 Ryan O'halloran's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Ryan O'halloran affiliated with any hospitals?

According to CMS data, Ryan O'halloran is affiliated with Montefiore New Rochelle Hospital and White Plains Hospital Center.

When was this NPI record last updated?

The NPPES record for Ryan O'halloran was last updated on March 9, 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.