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DR. CHRISTINE SUNJUNG AHN MD
NPI 1336307461
Emergency Medicine in Stony Brook, NY

Active since May 27, 2008PECOS Enrolled
STONY BROOK UNIVERSITY HOSPITAL, DEPT OF EMERGENCY MEDICINE, STONY BROOK, NY 11794(631) 444-2478(631) 444-3919 Get Directions Write a Review

NPPES record last updated: July 13, 2010. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Christine Sunjung Ahn Md NPPES

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

DR. CHRISTINE SUNJUNG AHN MD (NPI 1336307461) is an individual emergency medicine provider in Stony Brook, New York, licensed in New York (257406) and active in the NPI registry since May 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1336307461
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDR. CHRISTINE SUNJUNG AHNCredential: MD
Location AddressSTONY BROOK UNIVERSITY HOSPITAL, DEPT OF EMERGENCY MEDICINEStony Brook, NY 11794-7148
Mailing AddressStony Brook University Hospital, Dept Of Emergency Medicine, Hsc, L-4, Room 080Stony Brook, NY 11794-7148 · (631) 444-2478 · Fax (631) 444-3919
Phone(631) 444-2478
Fax(631) 444-3919
Sole ProprietorNo
Enumeration DateMay 27, 2008
Last NPPES UpdateJuly 13, 2010
✔ NPI 1336307461 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 · 257406
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.
STONY BROOK UNIVERSITY HOSPITAL, Stony Brook, NY 11794
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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 (PECOS)

Dr. Christine Sunjung Ahn 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.

Medicare Billing Reassignment

Medicare enrollment records show Christine Ahn reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Stony Brook Emergency Physicians, University Faculty Practice Corporat
0.4 mi
Emergency Medicine
SUNY @ STONY BROOK, UNIVERSITY HOSPITAL, L4, RM 515
Stony Brook, NY 11794
  • Reassigned Medicare billing, New York enrollment
  • 77 clinicians in this Medicare group
NPI 1265487672 (631) 444-2406

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 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.
406 services400 patients
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.
67 services66 patients
Electrocardiogram (ecg) 1 to 3 leads with review by physician only 93042
An Electrocardiogram (ECG) is a non-invasive test that records the electrical activity of your heart. 1 to 3 leads or sensors are placed on your body to capture this data. A physician then reviews the results to evaluate your heart's health.
28 services28 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.
12 services12 patients
Insertion of needle into vein (3 years or older) 36410
This procedure involves placing a small needle into a vein, typically in the arm. It's done to collect blood for testing or to deliver medication. You may feel a quick pinch, but it's usually over in seconds. It's a common, safe procedure.
11 services11 patients
Initial hospital care with same-day admission and discharge with high level of medical decision making, per day, if using time, at least 85 minutes 99236
This service involves a brief hospital stay for a serious health issue. Patients are admitted and discharged on the same day, typically within 55 minutes. It allows for close monitoring and immediate treatment, ensuring optimal care.
11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11794 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.

DR. BENJAMIN RICHARD HODSON M.D.
Emergency Medicine
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE T9
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
LUCAS JAMES MCARTHUR M.D.
Family Medicine
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE T14
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
JEFF SEAN CHUANG MD
Student in an Organized Health Care Education/Training Program
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
MISS SARAH ROSE PESTIEAU M.D.
Internal Medicine
STONY BROOK UNIVERSITY HOSPITAL, DEPARTMENT OF MEDICINE HSC-T16 020
STONY BROOK, NY 11794
Suffolk County (631) 444-1106
DR. ELAINE FOX M.D.
Student in an Organized Health Care Education/Training Program
STONY BROOK UNIVERSITY HOSPITAL, MEDICAL STAFF OFFICE T14
STONY BROOK, NY 11794
Suffolk County (631) 444-2754
DR. LAWRENCE WILLIAM KELLY JR. MD
Emergency Medicine
STONY BROOK UNIVERSITY HOSPITAL, DEPARTMENT OF EMERGENCY MEDICINE, HSC, L-4, ROOM 080
STONY BROOK, NY 11794
Suffolk County (631) 444-3880
MRS. SUZETTE CATHERINE SMOOKLER M.S., R.D., CDN
Dietitian, Registered
STONY BROOK UNIVERSITY HOSPITAL, NICOLLS ROAD, LEVEL 1 RM 747
STONY BROOK, NY 11794
Suffolk County (631) 444-7757
MRS. JANINE ELIZABETH ROMEO RPA-C
Physician Assistant
STONY BROOK UNIVERSITY HOSPITAL, 1 EDMUND PELLIGRINO DRIVE
STONY BROOK, NY 11794
Suffolk County (631) 444-1444

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 Christine Ahn's NPI number?

The NPI number for Christine Ahn is 1336307461. It was assigned to this individual provider in the NPPES registry on May 27, 2008.

Where is Christine Ahn located?

Christine Ahn practices at Stony Brook University Hospital Dept Of Emergency Medicine, Stony Brook, NY 11794. The listed phone number is (631) 444-2478.

What is Christine Ahn's specialty?

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

Is Christine Ahn enrolled in Medicare?

Yes. Christine Ahn is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Christine Ahn's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Christine Ahn reassigns Medicare benefits to Stony Brook Emergency Physicians, University Faculty Practice Corporat (Stony Brook, NY). The 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 Christine Ahn'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 Christine Ahn was last updated on July 13, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.