Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Robert A Grillo Jr., M.D.
Psychiatry Physician in Groton, CT · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1770565566
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Robert A Grillo Jr.
Credential M.D.
Sex Male
Practice address 1 Wahoo Ave, Groton, CT, 06349
Phone (860) 694-4966
Fax (860) 694-3388
Enumeration date Nov 17, 2005
Last updated in NPPES Jun 20, 2023
Taxonomy & licenses
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 |
|---|---|---|---|
| 001264887 | Medicaid | CT | - |
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 Robert Grillo?
Robert Grillo is registered in NPPES with the primary taxonomy of Psychiatry Physician. 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 → David Lobozzo Psychiatry Physician · Groton, CT NPI 1063405132 Matthew Miller Periodontics · Groton, CT NPI 1043207004 Heidi Welch Family Nurse Practitioner · Groton, CT NPI 1700876000 Bruce Thompson Pharmacotherapy Pharmacist · Groton, CT NPI 1104801133 Willoughby Lloyd Pharmacist · Groton, CT NPI 1912986670 Dana Lacey Body Imaging Physician · Groton, CT NPI 1952372971 Mayela Llaurador-Castillo Clinical Psychologist · Groton, CT NPI 1073561429 James Davenport Audiologist · Groton, CT NPI 1225085673
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-20.