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DR. DONNA M TIMCHAK MD
NPI 1689641623
Pediatrics - Pediatric Cardiology in Morristown, NJ

Active since March 08, 2006PECOS Enrolled
100 MADISON AVE, MORRISTOWN, NJ 07960(973) 971-5996(973) 290-7979 Get Directions Write a Review

NPPES record last updated: June 3, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 3, 2026, Apr 4, 2019 (2 updates tracked since 2019).

About Dr. Donna M Timchak Md NPPES

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

DR. DONNA M TIMCHAK MD (NPI 1689641623) is an individual pediatric cardiology provider in Morristown, New Jersey, licensed in New Jersey (25MA05469800) and active in the NPI registry since March 2006. She is enrolled in Medicare PECOS and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1689641623
Entity TypeIndividualFemale
Primary Taxonomy2080P0202X
Provider Legal NameDR. DONNA M TIMCHAKCredential: MD
Location Address100 MADISON AVEMorristown, NJ 07960-6136
Mailing AddressPo Box 416457Boston, MA 02241-6457 · (973) 971-7163 · Fax (973) 898-3905
Phone(973) 971-5996
Fax(973) 290-7979
Sole ProprietorNo
Enumeration DateMarch 8, 2006
Last NPPES UpdateJune 3, 20262 updates tracked since enumeration
NPPES CertifiedJune 3, 2026
✔ NPI 1689641623 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0202X
Licenses✔ Licensed in NJ · 25MA05469800✔ Licensed in NY · 167609
Definition
A pediatric cardiologist provides comprehensive care to patients with cardiovascular problems. This specialist is skilled in selecting, performing and evaluating the structural and functional assessment of the heart and blood vessels, and the clinical evaluation of cardiovascular disease.
100 MADISON AVE, Morristown, NJ 07960
Open in Google Maps ↗

Secondary Practice Locations 4

Location 111 Overlook Rd Ste 230Summit, NJ 07901-3580 · Phone (973) 971-5996 · Fax (973) 290-7979
Location 299 Beauvoir AveSummit, NJ 07901-3533 · Phone (973) 971-5996 · Fax (973) 290-7979
Location 355 Madison Ave Fl 2Morristown, NJ 07960-7337 · Phone (973) 971-5996 · Fax (973) 290-7979
Location 455 Madison Ave Fl 1Morristown, NJ 07960-7337 · Phone (973) 971-7520 · Fax (973) 267-4165

Other Identifiers 1

Medicaid01546652NY

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Donna M Timchak Md 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 Donna Timchak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Practice Associates Medical Group
Same address
Internal Medicine
100 MADISON AVENUE, INTEROFFICE #68
Morristown, NJ 07960
  • Reassigned Medicare billing, New Jersey enrollment
  • 1,699 clinicians in this Medicare group
NPI 1427016385 (844) 264-2250

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 20

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

MELISSA LOPES M.D
Anesthesiology
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (201) 943-5831
MORRISTOWN MEMORIAL HOSPITAL
General Acute Care Hospital
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (888) 250-9947
VINCENT MAIXNER LCSW
Social Worker (Clinical)
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000
MEGAN LYNN CATHEY NP-C
Nurse Practitioner (Adult Health)
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5358
ANTHONY RIZZUTI
Nurse Anesthetist, Certified Registered
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (800) 991-9133
OMAR MOHAMMED ABDELFATTAH MBBCH
Student in an Organized Health Care Education/Training Program
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000
ALEXANDER CASCAIS MD
Student in an Organized Health Care Education/Training Program
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000
DEVEA RANI DE MD
Student in an Organized Health Care Education/Training Program
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000

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 Donna Timchak's NPI number?

The NPI number for Donna Timchak is 1689641623. It was assigned to this individual provider in the NPPES registry on March 8, 2006.

Where is Donna Timchak located?

Donna Timchak practices at 100 Madison Ave, Morristown, NJ 07960. The listed phone number is (973) 971-5996.

What is Donna Timchak's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.

Is Donna Timchak enrolled in Medicare?

Yes. Donna Timchak is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Donna Timchak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Donna Timchak reassigns Medicare benefits to Practice Associates Medical Group (Morristown, NJ). 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 Donna Timchak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Donna Timchak accept?

Health plans from Oscar Health list Donna Timchak as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Donna Timchak was last updated on June 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.