Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Gregory K. Johnson, M.D.
Specialist in Haverhill, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1922049402
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Registry record
Entity type Individual (Type 1)
Name Dr. Gregory K. Johnson
Credential M.D.
Sex Male
Practice address 288 Groveland St, Haverhill, MA, 01830
Phone (978) 373-3851
Fax (978) 521-6542
Enumeration date Jun 8, 2006
Last updated in NPPES Jul 8, 2007
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 |
|---|---|---|---|
| 3097391 | 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
What is the NPI number for Gregory Johnson?
The National Provider Identifier (NPI) for Gregory Johnson is 1922049402, a Type 1 (individual) record in the CMS NPPES registry.
Where does Gregory Johnson practice?
The practice location on file with NPPES is in Haverhill, MA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.