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DR. MITCHELL KLEINBERG M.D.
NPI 1447367537
Pediatrics - Adolescent Medicine in Holbrook, NY

Active since August 24, 2006PECOS Enrolled
270 UNION AVE, HOLBROOK, NY 11741(631) 558-4442(631) 471-3039 Get Directions Write a Review

NPPES record last updated: April 10, 2012. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Mitchell Kleinberg M.d. NPPES

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

DR. MITCHELL KLEINBERG M.D. (NPI 1447367537) is an individual adolescent medicine provider in Holbrook, New York, licensed in New York (154133) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1447367537
Entity TypeIndividualMale
Primary Taxonomy2080A0000X
Provider Legal NameDR. MITCHELL KLEINBERGCredential: M.D.
Location Address270 UNION AVEHolbrook, NY 11741-1823
Mailing Address270 Union AveHolbrook, NY 11741-1823 · (631) 588-4442 · Fax (631) 471-3039
Phone(631) 558-4442
Fax(631) 471-3039
Sole ProprietorYes
Enumeration DateAugust 24, 2006
Last NPPES UpdateApril 10, 2012
✔ NPI 1447367537 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Adolescent MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080A0000X
License✔ Licensed in NY · 154133
Definition
A pediatrician who specializes in adolescent medicine is a multi-disciplinary healthcare specialist trained in the unique physical, psychological and social characteristics of adolescents, their healthcare problems and needs.
270 UNION AVE, Holbrook, NY 11741
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Other Identifiers 2

Medicaid00765857NY
Medicare UPINA6388NY

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mitchell Kleinberg 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 Mitchell Kleinberg reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Optum Medical Care, P.C.
43 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.

Other Providers at the Same Location NPPES 19

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

MS. LACI NICOLE COOK CPNP
Nurse Practitioner (Pediatrics)
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-4442
FREED, SCHERZ, KLEINBERG, NUSSBAUM & FESTA, MD, LLP
Legal Medicine
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-7973
DEBRA ANNE REILLY PNP
Nurse Practitioner (Pediatrics)
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-4442
MRS. BARBARA LORETTA KOLK-SEDA RPAC
Physician Assistant (Medical)
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-4442
MRS. PHYLLIS G SIMON-GOLDMAN MD
Pediatrics (Adolescent Medicine)
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 331-6200
DR. JASON KRONBERG D.O.
Pediatrics
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-4442
DR. ROBERT S FESTA M.D., LIC
Pediatrics (Adolescent Medicine)
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-4442
DR. MICHAEL NUSSBAUM M.D.
Pediatrics (Adolescent Medicine)
270 UNION AVE
HOLBROOK, NY 11741
Suffolk County (631) 588-4442

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 Mitchell Kleinberg's NPI number?

The NPI number for Mitchell Kleinberg is 1447367537. It was assigned to this individual provider in the NPPES registry on August 24, 2006.

Where is Mitchell Kleinberg located?

Mitchell Kleinberg practices at 270 Union Ave, Holbrook, NY 11741. The listed phone number is (631) 558-4442.

What is Mitchell Kleinberg's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Adolescent Medicine, with taxonomy code 2080A0000X.

Is Mitchell Kleinberg enrolled in Medicare?

Yes. Mitchell Kleinberg is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mitchell Kleinberg's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mitchell Kleinberg 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 Mitchell Kleinberg'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 Mitchell Kleinberg was last updated on April 10, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.