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

Mark Grebener, LLC

Organization Addiction (Substance Use Disorder) Counselor · NPI 1063697738

Mark Grebener, LLC is an Addiction (Substance Use Disorder) Counselor in Denver, Colorado. Licensed in Colorado and Illinois. Registered with an NPI since 2007.

Licensed in
CO, IL
In the registry since
2007
Specialties on file
3
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

7900 E Union Ave Ste 1100
Denver, CO 80237-2735
Phone: (303) 883-4808
Fax: (303) 794-6736
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence CSW434 (CO)
Addiction (Substance Use Disorder) Counselor Taxonomy 101YA0400X · Licence LAC127 (CO)
Clinical Social Worker Taxonomy 1041C0700X (IL)

Record details

NPI number1063697738
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Grebener — Principal · (303) 883-4808
NPI enumeratedDecember 31, 2007
Last updated in NPPESDecember 31, 2007
Mailing address1418 E Irwin Ln, Centennial, CO 80122-3081

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