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

Dr. Mark E Lassise, MD

Individual provider Psychiatry Physician · NPI 1023002508

Dr. Mark E Lassise, MD is a Psychiatry in Mason City, Iowa. Graduated from University of Colorado School of Medicine, Denver in 1980, 46 years ago. Practices with North Iowa Mercy Clinics, a 300-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Iowa.

Years since qualifying
46
Trained at
University of Colorado School of Medicine, Denver
Licensed in
IA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

250 S Crescent Dr Ste 10
Mason City, IA 50401-2926
Phone: (641) 494-5170
Fax: (641) 494-5175
Show map & directions

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

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 22919 (IA)

Record details

NPI number1023002508
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 9, 2005
Last updated in NPPESJuly 6, 2020
Certification dateJuly 6, 2020
Mailing address250 S Crescent Dr, Mason City, IA 50401-2926

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolUNIVERSITY OF COLORADO SCHOOL OF MEDICINE, DENVER
Graduated 1980 (46 years in practice)
Group practice North Iowa Mercy Clinics — 300 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

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