Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Douglas Nelson Callen, PH.D.

Audiologist-Hearing Aid Fitter in Kittanning, PA · enumerated 2005 · practices at Armstrong Speech & Hearing Aid Center.

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

National Provider Identifier

1043217128

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Registry record

Entity type Individual (Type 1)

Name Dr. Douglas Nelson Callen

Credential PH.D.

Sex Male

Practice address Kittanning, PA, 16201

Phone (724) 548-4455

Fax (724) 543-4491

Enumeration date Jul 5, 2005

Last updated in NPPES Apr 12, 2012

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License AT000075L (PA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
251537307	Other	PA	UPMC, UMWA FUNDS
0014183060003	Medicaid	PA	-
1015995	Other	PA	GATEWAY

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

What specialty is Douglas Callen?

Douglas Callen 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.

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.

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Armstrong Speech & Hearing Aid Center Audiologist-Hearing Aid Fitter · Kittanning, PA NPI 1730446055

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-12.