Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Catherine Day
Psychologist in Frederick, MD · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1699636720
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Registry record
Entity type Individual (Type 1)
Name Dr. Catherine Day
Sex Female
Practice address 10 N Jefferson St Ste 203, Frederick, MD, 21701
Phone (202) 750-1028
Enumeration date Nov 19, 2025
Last updated in NPPES May 22, 2026
Taxonomy & licenses
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 is the NPI number for Catherine Day?
The National Provider Identifier (NPI) for Catherine Day is 1699636720, a Type 1 (individual) record in the CMS NPPES registry.
Where does Catherine Day practice?
The practice location on file with NPPES is in Frederick, MD. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Janeen Rao Clinical Social Worker · Frederick, MD NPI 1710264676 Laura Morlok Professional Counselor · Frederick, MD NPI 1699026567 Rachael Pomato Nutrition Education Nutritionist · Frederick, MD NPI 1790233252 Amber Frazier Clinical Social Worker · Frederick, MD NPI 1043739071 Marianne Riley Psychotherapy LLC Community/Behavioral Health Agency · Frederick, MD NPI 1689158883 Aliza Ifrah Mental Health Counselor · Frederick, MD NPI 1578153888 Maryland Child Therapy Specialists, LLC Clinical Social Worker · Frederick, MD NPI 1891459202 Harleigh Robbins Mental Health Counselor · Frederick, MD NPI 1003574104
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-22.