DR. AARON RYOO MD
NPI 1023549912
Emergency Medicine in Brooklyn, NY

Q: What is Aaron Ryoo's NPI number?

The NPI number for Aaron Ryoo is 1023549912. It was assigned to this individual provider in the NPPES registry on March 23, 2017.

Q: What is Aaron Ryoo's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Aaron Ryoo was last updated on June 8, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.

Active since March 23, 2017PECOS Enrolled

506 6TH ST, BROOKLYN, NY 11215(718) 780-5040 Get Directions Write a Review

NPPES record last updated: June 8, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 8, 2020, Mar 23, 2017 (2 updates tracked since 2017).

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About Dr. Aaron Ryoo Md NPPES

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

DR. AARON RYOO MD (NPI 1023549912) is an individual emergency medicine provider in Brooklyn, New York, licensed in New York (304545-01) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS and maintains a secondary practice location in Brooklyn.

NPPES Registry Identity

NPI1023549912

Entity TypeIndividualMale

Primary Taxonomy207P00000X

Provider Legal NameDR. AARON RYOOCredential: MD

Location Address506 6TH STBrooklyn, NY 11215-3609

Mailing Address506 6th StBrooklyn, NY 11215-3609

Phone(718) 780-5040

Sole ProprietorYes

Enumeration DateMarch 23, 2017

Last NPPES UpdateJune 8, 20202 updates tracked since enumeration

NPPES CertifiedJune 8, 2020

✔ NPI 1023549912 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

License✔ Licensed in NY · 304545-01

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.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

506 6TH ST, Brooklyn, NY 11215

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Secondary Practice Location 1

Location 14802 10th Ave, 4802 10th AvenueBrooklyn, NY 11219-2916 · Phone (718) 283-8000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Aaron Ryoo 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 Reassignments

Medicare enrollment records show Aaron Ryoo reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Kings Physician Services, PC

Same address

Emergency Medicine

506 6TH STREET, DEPARTMENT OF EMERGENCY MEDICINE
Brooklyn, NY 11215

Reassigned Medicare billing, New York enrollment
1,029 clinicians in this Medicare group

NPI 1326698879 (718) 780-3424

Brookdale Hospital Medical Center

2.0 mi

General Acute Care Hospital

1 BROOKDALE PLZ STE 666
Brooklyn, NY 11212

Reassigned Medicare billing, New York enrollment
782 clinicians in this Medicare group

NPI 1720028772 (718) 240-8352

Maimonides Medical Center - Mmc Emergency Physicians Fpp

2.2 mi

Emergency Medicine

4802 10TH AVE
Brooklyn, NY 11219

Reassigned Medicare billing, New York enrollment
189 clinicians in this Medicare group

NPI 1982708202 (718) 283-8773

Interfaith Emergency Medicine, P.C.

2.3 mi

Emergency Medicine

1545 ATLANTIC AVE
Brooklyn, NY 11213

Reassigned Medicare billing, New York enrollment
Medicare enrollment name: Interfaith Emergency Medicine PC
145 clinicians in this Medicare group

NPI 1457643785 (718) 240-8352

Kingsbrook Medical Associates, PC

2.5 mi

Multi-Specialty

585 SCHENECTADY AVE
Brooklyn, NY 11203

Reassigned Medicare billing, New York enrollment
192 clinicians in this Medicare group

NPI 1104112838 (718) 604-5532

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.

171 services169 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.

121 services121 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.

54 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.

27 services27 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.

13 services13 patients

Ultrasound of heart, follow-up 93308

A follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11215 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. VIVIAN JOLLEY BEA M.D.

Surgery

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-3288

YANJIN YANG

Internal Medicine

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-3000

JOY THERESE MULLEN RN, NP

Nurse Practitioner (Adult Health)

506 6TH ST, EP2
BROOKLYN, NY 11215

Kings County (718) 780-5040

ASHWAD AFZAL M.D.

Internal Medicine

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-5246

DR. DANIAH ALBOKHARI M.D.

Student in an Organized Health Care Education/Training Program

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-5260

SASIS SIRIKANJANAPONG

Pathology (Anatomic Pathology)

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-3634

DR. DANIELLE ABADI MD

Pediatrics

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-5260

KOREN H KWAG MD

Student in an Organized Health Care Education/Training Program

506 6TH ST
BROOKLYN, NY 11215

Kings County (718) 780-3000

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 Aaron Ryoo's NPI number?

The NPI number for Aaron Ryoo is 1023549912. It was assigned to this individual provider in the NPPES registry on March 23, 2017.

Where is Aaron Ryoo located?

Aaron Ryoo practices at 506 6th St, Brooklyn, NY 11215. The listed phone number is (718) 780-5040.

What is Aaron Ryoo's specialty?

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

Is Aaron Ryoo enrolled in Medicare?

Yes. Aaron Ryoo is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Aaron Ryoo's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Ryoo reassigns Medicare benefits to 5 organizations: Kings Physician Services, PC (Brooklyn, NY), Brookdale Hospital Medical Center (Brooklyn, NY), Maimonides Medical Center - Mmc Emergency Physicians Fpp (Brooklyn, NY), Interfaith Emergency Medicine, P.C. (Brooklyn, NY) and Kingsbrook Medical Associates, PC (Brooklyn, 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 Aaron Ryoo'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 Aaron Ryoo was last updated on June 8, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.