Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mark Cieniawski, MD

Individual provider Internal Medicine Physician · NPI 1205870607

Mark Cieniawski, MD is an 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
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
Mailing address144 State St, Portland, ME 04101-3776

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

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