Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Yongching Chang-Allen, M.A. CCC-A

Audiologist-Hearing Aid Fitter in Alhambra, CA · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1285843821

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Registry record

Entity type Individual (Type 1)

Name Ms. Yongching Chang-Allen

Credential M.A. CCC-A

Sex Female

Practice address 41 N Garfield Ave, Suite #101, Alhambra, CA, 91801

Phone (626) 284-4633

Fax (626) 284-4162

Enumeration date May 21, 2007

Last updated in NPPES Aug 6, 2015

Taxonomy & licenses

237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License AU 1955 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
AU0019550	Medicaid	CA	-

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.

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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 Yongching Chang-Allen?

Yongching Chang-Allen is registered in NPPES with the primary taxonomy of Audiologist-Hearing Aid Fitter. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-08-06.