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DR. STEPHEN MASLAK M.D.
NPI 1083931497
Internal Medicine - Infectious Disease in New York, NY

Active since April 24, 2010PECOS EnrolledAccepts Medicare Assignment
NORTHWELL HEALTH PHYSICIAN PARTNERS, 178 E 85TH STREET, 4TH FLOOR, NEW YORK, NY 10028(212) 434-3427(212) 434-3639 Get Directions Write a Review

NPPES record last updated: August 14, 2018. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Aug 14, 2018, Jul 30, 2018 (2 updates tracked since 2018).

About Dr. Stephen Maslak M.d. NPPES

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

DR. STEPHEN MASLAK M.D. (NPI 1083931497) is an individual infectious disease provider in New York, New York, licensed in New York (265749) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, is affiliated with Lenox Hill Hospital, and is a graduate of Other (2009).

NPPES Registry Identity

NPI1083931497
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. STEPHEN MASLAKCredential: M.D.
Location AddressNORTHWELL HEALTH PHYSICIAN PARTNERS, 178 E 85TH STREET, 4TH FLOORNew York, NY 10028
Mailing Address1408 Richmond RdStaten Island, NY 10304-2312 · (718) 979-5646
Phone(212) 434-3427
Fax(212) 434-3639
Sole ProprietorNo
Medical School CMSOtherGraduated 2009
Enumeration DateApril 24, 2010
Last NPPES UpdateAugust 14, 20182 updates tracked since enumeration
✔ NPI 1083931497 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in NY · 265749
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
NORTHWELL HEALTH PHYSICIAN PARTNERS, New York, NY 10028
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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 and accepts Medicare assignment

Dr. Stephen Maslak 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 ID4183872609
PECOS Enrollment IDI20120907000023
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

2

Medicare enrollment records show Stephen Maslak reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

North Shore-Lij Medical PC
5.5 mi
Urology
1010 NORTHERN BLVD STE 110
Great Neck, NY 11021
  • Reassigned Medicare billing, New York enrollment
  • 9,353 clinicians in this Medicare group
NPI 1053688572 (516) 321-7400
Icahn School Of Medicine At Mount Sinai
7.9 mi
Thoracic Surgery (Cardiothoracic Vascular Surgery)
1111 AMSTERDAM AVENUE
New York, NY 10002
  • Reassigned Medicare billing, New York enrollment
  • 346 clinicians in this Medicare group
NPI 1124497912 (212) 523-4000

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 4

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.
549 services163 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.
113 services106 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
84 services43 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.
29 services19 patients

Hospital Affiliations CMS Care Compare

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

Lenox Hill Hospital

Acute Care Hospitals · New York, NY
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330119
Location100 East 77th StreetNew York, NY 10021 · New York County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10028 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.

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 Stephen Maslak's NPI number?

The NPI number for Stephen Maslak is 1083931497. It was assigned to this individual provider in the NPPES registry on April 24, 2010.

Where is Stephen Maslak located?

Stephen Maslak practices at Northwell Health Physician Partners 178 E 85th Street, 4th Floor, New York, NY 10028. The listed phone number is (212) 434-3427.

What is Stephen Maslak's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Stephen Maslak enrolled in Medicare?

Yes. Stephen Maslak 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 Stephen Maslak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Maslak reassigns Medicare benefits to 2 organizations: North Shore-Lij Medical PC (Great Neck, NY) and Icahn School Of Medicine At Mount Sinai (New York, 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 Stephen Maslak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Stephen Maslak affiliated with any hospitals?

According to CMS data, Stephen Maslak is affiliated with Lenox Hill Hospital.

When was this NPI record last updated?

The NPPES record for Stephen Maslak was last updated on August 14, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.