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

Dr. Daniel L Hamilos, MD

Individual provider Allergy & Immunology Physician · NPI 1558347047

Dr. Daniel L Hamilos, MD is an Allergy/Immunology in Mason City, Iowa. Graduated from Northwestern University Feinberg Medical School in 1979, 47 years ago. Practices with North Iowa Mercy Clinics, a 300-clinician group and accepts Medicare assignment. Licensed in Iowa and Massachusetts.

Years since qualifying
47
Trained at
Northwestern University Feinberg Medical School
Licensed in
IA, MA
In the registry since
2005
Specialties on file
4
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
Mason City, IA 50401-2926
Phone: (641) 494-5380
Show map & directions

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

Specialties & licences

Allergy & Immunology Physician (primary) Taxonomy 207K00000X · Licence 52071 (IA)
Allergy & Immunology Physician Taxonomy 207K00000X · Licence 219164 (MA)
Clinical & Laboratory Immunology (Allergy & Immunology) Physician Taxonomy 207KI0005X · Licence 219164 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 219164 (MA)

Record details

NPI number1558347047
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 16, 2005
Last updated in NPPESOctober 23, 2023
Certification dateOctober 23, 2023
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 specialtyALLERGY/IMMUNOLOGY
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1979 (47 years in practice)
Group practice North Iowa Mercy Clinics — 300 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare