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

Individual provider Internal Medicine Physician · NPI 1205870607

Mark Cieniawski, MD practises Internal Medicine in Portland, Maine. Graduated from Northwestern University Feinberg Medical School in 1991, 35 years ago. Practices with Northern Maine Medical Center, a 44-clinician group and accepts Medicare assignment. Licensed in Maine.

Years since qualifying
35
Trained at
Northwestern University Feinberg Medical School
Licensed in
ME
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

144 State St
Portland, ME 04101-3776 Not confirmed with CMS for 19 years — call before visiting
Phone: (207) 879-3040
Fax: (207) 879-3947
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 013544 (ME)

Record details

NPI number1205870607
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 15, 2006
Last updated in NPPESSeptember 4, 2007

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1991 (35 years in practice)
Group practice Northern Maine Medical Center — 44 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 patients21
Services billed 27 a service is one billed item, such as a visit, a test or a procedure
Average patient age67

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.

  • Northern Maine Medical Center Hospital · Fort Kent, ME
  • Valley Home Health Services Home health agency · Caribou, ME · listed as Valley Home Health Services, LLC
  • Northern Light A R Gould Hospital Hospital · Presque Isle, ME
  • Northern Light Home Care & Hospice Home health agency · So Portland, ME
  • Northern Light Home Care & Hospice Hospice · South Portland, ME

Colleagues at Northern Maine Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 44 clinicians in the practice; 12 are shown here.

Other providers in Portland