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

Robert Mesirow, DO

Individual provider Anesthesiology Physician · NPI 1801828942

Robert Mesirow, DO practises Anesthesiology in Hyannis, Massachusetts. Graduated from Chicago College of Osteopathy in 1991, 35 years ago. Practices with On Demand Anesthesia LLC, a 20-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
35
Trained at
Chicago College of Osteopathy
Licensed in
MA
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

27 Park St Cape Cod Hospital Anesthesia Dept
Hyannis, MA 02601 Not confirmed with CMS for 19 years — call before visiting
Phone: (508) 771-1800
Fax: (508) 790-1674
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence 209473 (MA)

Record details

NPI number1801828942
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 7, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolCHICAGO COLLEGE OF OSTEOPATHY
Graduated 1991 (35 years in practice)
Group practice On Demand Anesthesia Llc — 20 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients90
Services billed 90 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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.

Colleagues at On Demand Anesthesia LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 20 clinicians in the practice; 6 are shown here.

Other providers in Hyannis