Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mary C Underhill, PSY.D.
Psychologist in Norman, OK · enumerated 2012.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1487900858
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Registry record
Entity type Individual (Type 1)
Name Dr. Mary C Underhill
Credential PSY.D.
Sex Female
Practice address 712 Wall St, Norman, OK, 73069
Phone (405) 579-7560
Fax (405) 579-7563
Enumeration date Aug 3, 2012
Last updated in NPPES Jul 8, 2026
Taxonomy & licenses
PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice.
About the PSYD 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 is the NPI number for Mary Underhill?
The National Provider Identifier (NPI) for Mary Underhill is 1487900858, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mary Underhill practice?
The practice location on file with NPPES is in Norman, OK. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Lois Goodgame Counselor · Norman, OK NPI 1215940267 Billy Sharp Clinical Psychologist · Norman, OK NPI 1225257447 Taylor English Psychologist · Norman, OK NPI 1376288985 Timothy Martin Professional Counselor · Norman, OK NPI 1790496693 Amy Ivy Psychiatric/Mental Health Nurse Practitioner · Norman, OK NPI 1215799473 Tichic Fikipo Professional Counselor · Norman, OK NPI 1669310918 Danny Boyd Professional Counselor · Norman, OK NPI 1487571527
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-08.