Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Seir Fen Davidson, PHARMD
Pharmacist in Crystal Lake, IL · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1417557596
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Registry record
Entity type Individual (Type 1)
Name Dr. Seir Fen Davidson
Credential PHARMD
Sex Female
Practice address 1205 S Il Route 31, Crystal Lake, IL, 60014
Phone (815) 455-4409
Enumeration date Oct 28, 2020
Last updated in NPPES Oct 28, 2020
Taxonomy & licenses
PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy.
About the PHARMD credential
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.
Frequently asked questions
What specialty is Seir Fen Davidson?
Seir Fen Davidson is registered in NPPES with the primary taxonomy of Pharmacist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-28.