Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark F Geer
Psychologist in Wellesley, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1609843507
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Registry record
Entity type Individual (Type 1)
Name Mark F Geer
Sex Male
Practice address 11 River St, Colony Care Behavioral Health, Wellesley, MA, 02481
Phone (781) 431-1177
Fax (781) 431-1181
Enumeration date Mar 1, 2006
Last updated in NPPES Jul 13, 2026
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0510645 | Medicaid | MA | - |
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
Where does Mark Geer practice?
The practice location on file with NPPES is in Wellesley, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Geer?
The National Provider Identifier (NPI) for Mark Geer is 1609843507, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Tracy Barnes Clinical Social Worker · Wellesley, MA NPI 1053395616 Tanya Cherkerzian Clinical Social Worker · Wellesley, MA NPI 1790760858 Susan Ruskin Psychiatry Physician · Wellesley, MA NPI 1073586780 Lois Ashcroft Mental Health Counselor · Wellesley, MA NPI 1700851490 Katherine Eyre Clinical Social Worker · Wellesley, MA NPI 1356316988 Colony Care Inc Mental Health Counselor · Wellesley, MA NPI 1720053408 Laura Kinney Clinical Social Worker · Wellesley, MA NPI 1487629176 Cathy Spear Clinical Social Worker · Wellesley, MA NPI 1619944519
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-13.