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DR. RONALD KEITH WILLENBORG M.D.
NPI 1801897897
Internal Medicine in Upper Montclair, NJ

Active since August 02, 2005PECOS Enrolled
543 VALLEY RD STE 4, UPPER MONTCLAIR, NJ 07043(973) 746-6466(973) 746-0312 Get Directions Write a Review

NPPES record last updated: July 14, 2010. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Ronald Keith Willenborg M.d. NPPES

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

DR. RONALD KEITH WILLENBORG M.D. (NPI 1801897897) is an individual internal medicine provider in Upper Montclair, New Jersey, licensed in New Jersey (25MA03592100) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801897897
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. RONALD KEITH WILLENBORGCredential: M.D.
Location Address543 VALLEY RD STE 4Upper Montclair, NJ 07043-1844
Mailing Address543 Valley Rd Ste 4Upper Montclair, NJ 07043-1844 · (973) 746-6466 · Fax (973) 746-0312
Phone(973) 746-6466
Fax(973) 746-0312
Sole ProprietorYes
Enumeration DateAugust 2, 2005
Last NPPES UpdateJuly 14, 2010
✔ NPI 1801897897 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in NJ · 25MA03592100
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.
543 VALLEY RD STE 4, Upper Montclair, NJ 07043
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Other Identifiers 12

Other0004574647NJ · Aetna
OtherP3601332NJ · Oxford Health
Other110009806Railroad Medicare
Medicare ID-Type Unspecified509176
Medicaid3213803NJ
OtherJ2407NJ · Horizon Blue Cross/shield
Medicare UPINC56560
Other31D08NY · Empire Blue Shield
OtherNJ3106NJ · First Health
Other8971366NJ · Cigna
Other001130735NJ · United Healthcare
OtherOK0464NJ · Health Net

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ronald Keith Willenborg 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 07043 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
$144.86 typical visit price
range $63.84 – $190.92
Typical copayment $36.21 (range $15.96 – $47.73)
Most-billed visit code 99204
Established Patient
$111.57 typical visit price
range $20.97 – $155.92
Typical copayment $27.89 (range $5.24 – $38.98)
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 Ronald Willenborg's NPI number?

The NPI number for Ronald Willenborg is 1801897897. It was assigned to this individual provider in the NPPES registry on August 2, 2005.

Where is Ronald Willenborg located?

Ronald Willenborg practices at 543 Valley Rd Ste 4, Upper Montclair, NJ 07043. The listed phone number is (973) 746-6466.

What is Ronald Willenborg's specialty?

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

Is Ronald Willenborg enrolled in Medicare?

Yes. Ronald Willenborg is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Ronald Willenborg was last updated on July 14, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.