Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Nicholas S Warren

Individual provider Critical Care Medicine Registered Nurse · NPI 1023538642

Nicholas S Warren is registered under Certified Registered Nurse Anesthetist (CRNA) in Livingston, New Jersey. Qualified in 2017, 9 years ago. Practices with Shrewsbury Ambulatory Anesthesia LLC, a 138-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
9
Licensed in
NJ
In the registry since
2017
Specialties on file
2
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Practice location Address checks out

94 Old Short Hills Rd
Livingston, NJ 07039-5672
Phone: (973) 322-5000
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 201 Lyons Ave, Newark, NJ 07112-2027 — (800) 843-2384

Specialties & licences

Certified Registered Nurse Anesthetist (primary) Taxonomy 367500000X · Licence 26NJ00776700 (NJ)
Critical Care Medicine Registered Nurse Taxonomy 163WC0200X · Licence 26NR15098000 (NJ)

Record details

NPI number1023538642
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedJune 24, 2017
Last updated in NPPESMarch 17, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCERTIFIED REGISTERED NURSE ANESTHETIST (CRNA)
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Shrewsbury Ambulatory Anesthesia Llc — 138 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients164
Services billed 185 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Shrewsbury Ambulatory Anesthesia LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 138 clinicians in the practice; 12 are shown here.

Other providers in Livingston