Quick answers
- Which hospitals does Katherine E. O'Brien work at?
- Medicare's official clinician data lists Katherine E. O'Brien at 3 hospitals: Englewood Hospital and Medical Center, Hackensack University Medical Center and Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Katherine E. O'Brien see patients?
- Medicare's clinician data lists 1 practice location in Denville, NJ. Call before your visit to confirm the address.
- What is Katherine E. O'Brien's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Katherine E. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine E. O'Brien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Katherine E. O'Brien?
- (973) 784-3935, as listed in official Medicare / NPI Registry data.
- What is Katherine E. O'Brien's NPI number?
- 1033159124. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Katherine E. O'Brien works
Medicare's Facility Affiliation Data lists Katherine E. O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Englewood Hospital and Medical CenterEnglewood, NJ · Acute Care Hospital · CCN 310045
- Hackensack University Medical CenterHackensack, NJ · Acute Care Hospital · CCN 310001
- Valley HospitalParamus, NJ · Acute Care Hospital · CCN 310012
Practice locations
Addresses where Katherine E. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 16 Pocono RdDenville, NJ 07834 (973) 784‑3935
Group practices
Medicare enrollment lists Katherine E. O'Brien as a member of this group (CMS data updated 2026-10-02).
- Lifeline Medical Associates LLC157 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Denville
Clinicians with the same Medicare primary specialty in Denville, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 2001 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033159124 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians