1. Home
  2. Directory
  3. New York
  4. New York New York
  5. Hospitalist
  6. NPI Profile

EVAN GELENN DIO SIAU M.D.
NPI 1205217973
Hospitalist in New York, NY

Active since June 17, 2015PECOS EnrolledAccepts Medicare Assignment
1ST AVENUE AT 16TH STREET, NEW YORK, NY 10003(212) 844-1808 Get Directions Write a Review

NPPES record last updated: August 4, 2023. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Oct 27, 2019, May 1, 2019 (2 updates tracked since 2019).

About Evan Gelenn Dio Siau M.d. NPPES

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

EVAN GELENN DIO SIAU M.D. (NPI 1205217973) is an individual hospitalist provider in New York, New York, licensed in New York (299726) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, is affiliated with Nyu Langone Hospitals, and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1205217973
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameEVAN GELENN DIO SIAUCredential: M.D.
Location Address1ST AVENUE AT 16TH STREETNew York, NY 10003
Mailing Address350 E 17th St, Fl 19, Suite 50New York, NY 10003-3805 · (212) 844-1808
Phone(212) 844-1808
Sole ProprietorYes
Medical School CMSOtherGraduated 2012
Enumeration DateJune 17, 2015
Last NPPES UpdateAugust 4, 20232 updates tracked since enumeration
NPPES CertifiedAugust 3, 2023
✔ NPI 1205217973 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in NY · 299726
Definition

Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.

1ST AVENUE AT 16TH STREET, New York, NY 10003
Open in Google Maps ↗

Secondary Practice Locations 4

Location 110 Union Sq ENew York, NY 10003-3314 · Phone (212) 844-1808
Location 2281 1st AveNew York, NY 10003-2925 · Phone (212) 844-1808
Location 34422 3rd Ave Bldg 3, Department of Internal MedicineBronx, NY 10457-2545 · Phone (718) 960-9000
Location 4350 E 17th StNew York, NY 10003-3805 · Phone (212) 420-4056

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Evan Gelenn Dio Siau M.d. 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 ID8628303864
PECOS Enrollment IDI20190711000070
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 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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
326 services134 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
311 services153 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.
55 services55 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
46 services46 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
45 services44 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.
33 services33 patients

Hospital Affiliations CMS Care Compare

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

Nyu Langone Hospitals

Acute Care Hospitals · New York, NY
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330214
Location550 First AvenueNew York, NY 10016 · New York County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10003 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
$150.24 typical visit price
range $65.69 – $198.19
Typical copayment $37.56 (range $16.42 – $49.54)
Most-billed visit code 99204
Established Patient
$114.88 typical visit price
range $21.20 – $160.66
Typical copayment $28.72 (range $5.30 – $40.16)
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 9

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

DR. DIMITRIOS VASILEIOS AVGERINOS MD
Specialist
1ST AVENUE AT 16TH STREET
NEW YORK, NY 10003
New York County (212) 428-4340
KUNAL JOSHI M.D.
Student in an Organized Health Care Education/Training Program
1ST AVENUE AT 16TH STREET, BETH ISRAEL MEDICAL CENTER
NEWYORK, NY 10003
New York County (630) 849-9769
CHRISTINE WIEST PAC
Physician Assistant
1ST AVENUE AT 16TH STREET
NEW YORK, NY 10003
New York County (212) 420-2953
MS. MARLA ANN SHU D.O.
Student in an Organized Health Care Education/Training Program
1ST AVENUE AT 16TH STREET, BETH ISRAEL MEDICAL CENTER
NEW YORK, NY 10003
New York County (347) 323-3087
ASHTON A MONDRAGON PA
Physician Assistant
1ST AVENUE AT 16TH STREET, EMERGENCY DEPARTMENT
NEW YORK, NY 10003
New York County (212) 420-2840
DR. CLAIRE LOUISE JACKSON-RABINOWITZ D.O.
Psychiatry & Neurology (Psychiatry)
1ST AVENUE AT 16TH STREET, MILTON AND CARROLL PETRIE DIVISION
NEW YORK, NY 10003
New York County (212) 420-2400
DR. CHIARRA MARIE ORNILLO M.D.
Internal Medicine (Nephrology)
1ST AVENUE AT 16TH STREET
NEW YORK, NY 10003
New York County (212) 420-4070
DR. MAY LI M.D.
Emergency Medicine
1ST AVENUE AT 16TH STREET
NEW YORK, NY 10003
New York County (212) 420-2840

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 Evan Siau's NPI number?

The NPI number for Evan Siau is 1205217973. It was assigned to this individual provider in the NPPES registry on June 17, 2015.

Where is Evan Siau located?

Evan Siau practices at 1st Avenue At 16th Street, New York, NY 10003. The listed phone number is (212) 844-1808.

What is Evan Siau's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Evan Siau enrolled in Medicare?

Yes. Evan Siau 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.

Is Evan Siau affiliated with any hospitals?

According to CMS data, Evan Siau is affiliated with Nyu Langone Hospitals.

When was this NPI record last updated?

The NPPES record for Evan Siau was last updated on August 4, 2023. NPI Profile syncs with the weekly NPPES data releases published by CMS.