Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ellen Ludwig, M.S. L.AC.
Acupuncturist in Phoenix, AZ · enumerated 2021.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1255002119
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Registry record
Entity type Individual (Type 1)
Name Ellen Ludwig
Credential M.S. L.AC.
Sex Female
Practice address 4545 N 36th St Ste 100, Phoenix, AZ, 85018
Phone (480) 525-7411
Enumeration date Sep 21, 2021
Last updated in NPPES Sep 21, 2021
Taxonomy & licenses
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
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.
What specialty is Ellen Ludwig?
Ellen Ludwig is registered in NPPES with the primary taxonomy of Acupuncturist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-09-21.