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ADVANCED INTERNAL MEDICINE GROUP PC
NPI 1669548087
Internal Medicine in Greenvale, NY

Active since November 28, 2006CLIA 33D0155442 · Certificate of Compliance
2200 NORTHERN BLVD, SUITE 133, GREENVALE, NY 11548(516) 352-8100(516) 352-7348 Get Directions Write a Review

NPPES record last updated: April 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 29, 2026, Mar 27, 2025, Aug 31, 2020 and 1 more (4 updates tracked since 2017).

About Advanced Internal Medicine Group Pc NPPES

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

ADVANCED INTERNAL MEDICINE GROUP PC (NPI 1669548087) is a healthcare organization registered as an internal medicine in Greenvale, New York and active in the NPI registry since November 2006. The organization holds a CLIA Certificate of Compliance certificate valid through May 17, 2028 and lists Leon Schwechter, President, as its authorized official.

NPPES Registry Identity

NPI1669548087
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameADVANCED INTERNAL MEDICINE GROUP PC
Location Address2200 NORTHERN BLVD, SUITE 133Greenvale, NY 11548-1219
Mailing Address2200 Northern Blvd Ste 133Greenvale, NY 11548-1226 · (516) 352-8100 · Fax (516) 352-7348
Phone(516) 352-8100
Fax(516) 352-7348
Organization SubpartNo
Authorized OfficialLeon SchwechterPresident · (516) 352-8100
Enumeration DateNovember 28, 2006
Last NPPES UpdateApril 29, 20264 updates tracked since enumeration
NPPES CertifiedApril 29, 2026
✔ NPI 1669548087 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in NY · 138681
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · Geriatric MedicineTaxonomy 207RG0300X
2200 NORTHERN BLVD, Greenvale, NY 11548
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Other Identifiers 3

Other1225078314NY · Leon Schwecher Npi #
Other1508806712NY · Javier Morales Npi #
OtherW87631NY · Group Medicare Provider #

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Advanced Internal Medicine Group Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by March 31, 2027

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateNew YorkEnrollment IDO20040326000709Non-DME Part B · Clinic/Group PracticeDue dateMarch 31, 2027
Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

9

Medicare enrollment records show 9 clinicians reassign Medicare billing to Advanced Internal Medicine Group PC, which bills Medicare for the services they deliver. Of these, 3 practice at this address and 5 within 10 miles. They are listed nearest first.

Clinicians, nearest first (9)

Alicia Hamid, NURSE PRACTITIONER
Nurse Practitioner
NPI 1831846948
2200 NORTHERN BLVD STE 133
Greenvale, NY 11548
(516) 352-8100
✔ PECOS✔ Accepts MedicareSame address
Javier Morales, M.D.
Internal Medicine
NPI 1508806712
2200 NORTHERN BLVD SUITE 133
Greenvale, NY 11548
(516) 352-8100
✔ PECOS✔ Accepts MedicareSame address
Leon Schwechter, D.O.
Internal Medicine
NPI 1225078314
2200 NORTHERN BLVD SUITE 133
Greenvale, NY 11548
(516) 352-8100
✔ PECOS✔ Accepts MedicareSame address
Erin Morrissey, NP
Nurse Practitioner
NPI 1225416969
310 E SHORE RD SUITE 103
Great Neck, NY 11023
(516) 352-8100
✔ PECOS✔ Accepts Medicare4.1 mi
Keva Galdamez, FNP
Nurse Practitioner
NPI 1891110912
27005 76TH AVE
New Hyde Park, NY 11040
(516) 470-7310
✔ PECOS✔ Accepts Medicare5.1 mi
Ania Friedrich
Nurse Practitioner
NPI 1720167836
1250 WATERS PLACE
Bronx, NY 10461
(212) 298-7800
✔ PECOS✔ Accepts Medicare11 mi
Craig Grobman, D.O.
Internal Medicine
NPI 1639119621
900 WALT WHITMAN ROAD #205
Melville, NY 11747
(516) 817-6423
✔ PECOS12 mi
Neena Shah, MD
Geriatric Medicine
NPI 1275626210
3304 93RD ST SUITE 1W
Jackson Heights, NY 11372
(718) 335-4747
✔ PECOS✔ Accepts Medicare13 mi
Jennifer Dennehy, APN
Nurse Practitioner
NPI 1689125478
650 COMMACK RD
Commack, NY 11725
(631) 623-4100
✔ PECOS✔ Accepts Medicare18 mi

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Compliance 33D0155442

Advanced Internal Medicine Group · E Hills, NY
Active · expires May 17, 2028
CLIA Number33D0155442
Laboratory TypePhysician Office
Certificate Effective DateMay 18, 2026
Certificate Expiration DateMay 17, 2028
Laboratory DirectorDr. Leon Schwechter
Laboratory Phone(516) 352-8100
Laboratory LocationAdvanced Internal Medicine Group2200 Northern Boulevard, Suite 133, E Hills, NY 11548
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

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 Advanced Internal Medicine Group PC's NPI number?

The NPI number for Advanced Internal Medicine Group PC is 1669548087. It was assigned to this organization in the NPPES registry on November 28, 2006.

Where is Advanced Internal Medicine Group PC located?

Advanced Internal Medicine Group PC is located at 2200 Northern Blvd Suite 133, Greenvale, NY 11548. The listed phone number is (516) 352-8100.

What is Advanced Internal Medicine Group PC's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Advanced Internal Medicine Group PC enrolled in Medicare?

Yes. Advanced Internal Medicine Group PC is registered in the Medicare PECOS enrollment system.

When is Advanced Internal Medicine Group PC's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (New York, Clinic/Group Practice) is due for revalidation by March 31, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through Advanced Internal Medicine Group PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 9 clinicians in 3 Medicare specialties reassign their Medicare billing to Advanced Internal Medicine Group PC. A 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 the clinician's services. The largest specialties are Nurse Practitioner (5), Internal Medicine (3) and Geriatric Medicine (1). Of these, 3 practice at this address and 5 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Advanced Internal Medicine Group PC hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 33D0155442) is associated with this NPI, valid through May 17, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Advanced Internal Medicine Group PC was last updated on April 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.