Mark Grebener, LCSW LAC
NPI 1558462481 · Clinical Social Worker · Littleton, CO
Mark Grebener, LCSW LAC is a Clinical Social Worker provider in Littleton, CO (NPI 1558462481).
Provider details
- NPI number
- 1558462481
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW LAC
- Sex
- Male
- Sole proprietor
- No
- License
- LAC 127 (CO)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-25
- Last updated
- 2025-09-11
Frequently asked questions
- What is Mark Grebener's NPI number?
- Mark Grebener's National Provider Identifier (NPI) is 1558462481, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Grebener's specialty?
- Mark Grebener is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Grebener located?
- Mark Grebener's practice location on file with NPPES is 5574 S Prince St, Littleton, CO 80120.
- What is Mark Grebener's phone number?
- The practice phone number listed in the NPPES registry for Mark Grebener is (303) 883-4808.
- Is Mark Grebener's NPI active?
- Yes — Mark Grebener's NPI (1558462481) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.