Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mr. William J. Duff, MA, LPC

Individual provider Professional Counselor · NPI 1134351869

Mr. William J. Duff, MA, LPC is a Professional Counselor in Tucson, Arizona. Practices as a sole proprietor. Licensed in Arizona.

Licensed in
AZ
In the registry since
2009
Specialties on file
2
What do these letters mean?
MA — Master of Arts
A graduate arts degree.
LPC — Licensed Professional Counselor
A licensed mental health counsellor.

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Practice location Address checks out

13862 E Langtry Ln
Tucson, AZ 85747-9635
Phone: (602) 524-0036
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Mental Health Counselor (primary) Taxonomy 101YM0800X · Licence LPC-24868 (AZ)
Professional Counselor Taxonomy 101YP2500X · Licence LPC-24868 (AZ)

Record details

NPI number1134351869
Entity typeIndividual (Type 1)
GenderMale
Credentials MA , LPC
Sole proprietorYes
NPI enumeratedAugust 13, 2009
Last updated in NPPESAugust 6, 2026
Certification dateAugust 6, 2026

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