NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Deana L Dy, M.D.

Allergy & Immunology Physician in Crystal Lake, IL · enumerated 2005 · practices at Allerclinic,Ltd..

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1518950781

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Registry record

Entity type Individual (Type 1)
Name Deana L Dy
Credential M.D.
Sex Female
Practice address Crystal Lake, IL, 60014
Phone (815) 459-5440
Enumeration date Aug 23, 2005
Last updated in NPPES Jul 8, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License 036-057986 (IL) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
BCBS4901048 Other IL BCBS

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1518950781 active?
Yes, as of the latest NPPES snapshot, NPI 1518950781 is active (record last updated 2007-07-08).
How do I verify Deana Dy's NPI record?
Cross-check NPI 1518950781 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.