Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William G. Johnston Jr., M.D.
Urology Physician in Hyannis, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1568449320
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Registry record
Entity type Individual (Type 1)
Name Dr. William G. Johnston Jr.
Credential M.D.
Sex Male
Practice address 110 Main St, Hyannis, MA, 02601
Phone (508) 771-9550
Fax (508) 790-9304
Enumeration date Dec 22, 2005
Last updated in NPPES Nov 2, 2010
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 |
|---|---|---|---|
| 2045133 | Medicaid | MA | - |
| 340000696 | Other | MA | RAILROAD MEDICARE |
| 000000029926 | Other | MA | BMC HEALTHNET |
| 2077564001 | Other | MA | CIGNA |
| L15100 | Other | MA | BLUE CROSS BLUE SHIELD |
| 27036 | Other | MA | HARVARD PILGRIM HEALTH |
| 757982 | Other | MA | TUFTS HEALTH PLAN |
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 William Johnston?
William Johnston is registered in NPPES with the primary taxonomy of Urology 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 → Evangelos Geraniotis Urology Physician · Hyannis, MA NPI 1174500953 Robert Hartnett Urology Physician · Hyannis, MA NPI 1295712925 John Homa Urology Physician · Hyannis, MA NPI 1013994748 Mary Jo Jollett Certified Registered Nurse Anesthetist · Hyannis, MA NPI 1700851573 Brian Kowal Urology Physician · Hyannis, MA NPI 1790841310 Kevin Vilsaint Anesthesiology Physician · Hyannis, MA NPI 1710146030 Urology Outpatient Center of Cape Cod, PC Ambulatory Surgical Clinic/Center · Hyannis, MA NPI 1477881282 Raquel Amoldoni Certified Registered Nurse Anesthetist · Hyannis, MA NPI 1740511708
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-02.