DR. DEENA ELIANA MERZEL M.D.
NPI 1881191690
Pediatrics - Pediatric Gastroenterology in Syosset, NY

Q: What is Deena Merzel's NPI number?

The NPI number for Deena Merzel is 1881191690. It was assigned to this individual provider in the NPPES registry on April 9, 2018. The provider is also known as Dr. Deena Eliana Miller M.D..

Q: What is Deena Merzel's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Gastroenterology, with taxonomy code 2080P0206X.

Q: When was this NPI record last updated?

The NPPES record for Deena Merzel was last updated on July 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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 April 09, 2018PECOS Enrolled

575 UNDERHILL BLVD STE 200, SYOSSET, NY 11791(516) 822-4404 Get Directions Write a Review

NPPES record last updated: July 22, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Apr 12, 2022, Nov 10, 2021, Apr 9, 2018 (3 updates tracked since 2018).

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About Dr. Deena Eliana Merzel M.d. NPPES

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

DR. DEENA ELIANA MERZEL M.D. (NPI 1881191690) is an individual pediatric gastroenterology provider in Syosset, New York, licensed in New York (308687) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1881191690

Entity TypeIndividualFemale

Primary Taxonomy2080P0206X

Provider Legal NameDR. DEENA ELIANA MERZELCredential: M.D.

Location Address575 UNDERHILL BLVD STE 200Syosset, NY 11791-3416

Mailing Address575 Underhill Blvd Ste 200Syosset, NY 11791-3416

Phone(516) 822-4404

Sole ProprietorNo

Enumeration DateApril 9, 2018

Last NPPES UpdateJuly 22, 20253 updates tracked since enumeration

NPPES CertifiedJuly 22, 2025

✔ NPI 1881191690 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code2080P0206X

License✔ Licensed in NY · 308687

Definition

A pediatrician who specializes in the diagnosis and treatment of diseases of the digestive systems of infants, children and adolescents. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using lighted scopes to see internal organs.

575 UNDERHILL BLVD STE 200, Syosset, NY 11791

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Other Names 1

Former Name (1)Dr. Deena Eliana Miller M.d.

Secondary Practice Locations 2

Location 1111 E 210th StBronx, NY 10467-2401 · Phone (718) 741-2332 · Fax (718) 515-5426

Location 2100 Woods RdValhalla, NY 10595-1530 · Phone (914) 493-7000

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Deena Eliana Merzel M.d. 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 Deena Merzel reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Optum Medical Care, P.C.

29 mi

Cardiovascular Disease

90 SOUTH BEDFORD RD, MT KISCO MEDICAL GROUP PC
Mount Kisco, NY 10549

Reassigned Medicare billing, New York enrollment
Medicare enrollment name: Optum Medical Care PC
1,601 clinicians in this Medicare group

NPI 1982643003 (914) 241-1050

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11791 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

$154.28 typical visit price

range $67.40 – $203.53

Typical copayment $38.57 (range $16.85 – $50.88)

Most-billed visit code 99204

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

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

TERESA BIANCHI D.O.

Physical Medicine & Rehabilitation (Pain Medicine)

575 UNDERHILL BLVD STE 200
SYOSSET, NY 11791

Nassau County (516) 622-6105

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 Deena Merzel's NPI number?

The NPI number for Deena Merzel is 1881191690. It was assigned to this individual provider in the NPPES registry on April 9, 2018. The provider is also known as Dr. Deena Eliana Miller M.D..

Where is Deena Merzel located?

Deena Merzel practices at 575 Underhill Blvd Ste 200, Syosset, NY 11791. The listed phone number is (516) 822-4404.

What is Deena Merzel's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Gastroenterology, with taxonomy code 2080P0206X.

Is Deena Merzel enrolled in Medicare?

Yes. Deena Merzel is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Deena Merzel's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Deena Merzel reassigns Medicare benefits to Optum Medical Care, P.C. (Mount Kisco, 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 Deena Merzel'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 Deena Merzel was last updated on July 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.