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

Deana L Dy, MD

Individual provider Allergy & Immunology Physician · NPI 1518950781

Deana L Dy, MD is an Allergy & Immunology Physician in Crystal Lake, Illinois. Practices as a sole proprietor. Licensed in Illinois.

Licensed in
IL
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

25 S Virginia St Ste 203
Crystal Lake, IL 60014-5800
Phone: (815) 459-5440
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 036-057986 (IL)

Record details

NPI number1518950781
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedAugust 23, 2005
Last updated in NPPESJuly 8, 2007

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