Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William James Billett, M.D
Psychiatry Physician in Mobile, AL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1306848254
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Registry record
Entity type Individual (Type 1)
Name Dr. William James Billett
Credential M.D
Sex Male
Practice address 2400 Gordon Smith Dr, Mobile, AL, 36617
Phone (251) 473-4423
Enumeration date Aug 11, 2005
Last updated in NPPES Jul 9, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD 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 specialty is William Billett?
William Billett 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 → Marianne Saitz Psychiatry Physician · Mobile, AL NPI 1164424172 Norris Laurence Clinical Social Worker · Mobile, AL NPI 1285636183 Robert Ferguson Clinical Social Worker · Mobile, AL NPI 1841292596 Beverly Bryant Professional Counselor · Mobile, AL NPI 1861406951 Ramona Mcdaniel Professional Counselor · Mobile, AL NPI 1760541791 Ronald Finch Professional Counselor · Mobile, AL NPI 1598824773 Altapointe Health Systems, Inc. Mental Health Clinic/Center (Including Community Mental Health Center) · Mobile, AL NPI 1518095413 Judith Boswell Clinical Social Worker · Mobile, AL NPI 1508076720
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.