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

Mark Steven Larsen

Individual provider Certified Registered Nurse Anesthetist · NPI 1447223078

Mark Steven Larsen is registered under Certified Registered Nurse Anesthetist (CRNA) in Norwich, Connecticut. Qualified in 1990, 36 years ago. Practices with Integrated Anesthesia Associates LLC, a 402-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
36
Licensed in
CT
In the registry since
2006
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Practice location Address checks out

326 Washington St
Norwich, CT 06360-2740 Not confirmed with CMS for 14 years — call before visiting
Phone: (860) 823-6337
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Certified Registered Nurse Anesthetist (primary) Taxonomy 367500000X · Licence 001769 (CT)

Record details

NPI number1447223078
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedFebruary 13, 2006
Last updated in NPPESAugust 2, 2012

Medicare enrollment

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

Medicare specialtyCERTIFIED REGISTERED NURSE ANESTHETIST (CRNA)
Medical schoolOTHER
Graduated 1990 (36 years in practice)
Group practice Integrated Anesthesia Associates Llc — 402 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients115
Services billed 129 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Colleagues at Integrated Anesthesia Associates LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 402 clinicians in the practice; 12 are shown here.

Other providers in Norwich