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Mark Nahnsen, LCSW
NPI 1831480128 · Clinical Social Worker · Woodstock, NY
Mark Nahnsen, LCSW is a Clinical Social Worker provider in Woodstock, NY (NPI 1831480128).
Provider details
- NPI number
- 1831480128
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 077353-1 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(82/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 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
339 Ohayo Mountain Rd
Woodstock, NY 12498-2519
Phone: (845) 679-6429
Fax: (845) 331-4875
Street-level locationGet directions
Mailing address
339 Ohayo Mnt Road
Woodstock, NY 12498-2519
Registry dates
- Enumerated
- 2011-04-21
- Last updated
- 2011-04-21
Frequently asked questions
- What is Mark Nahnsen's NPI number?
- Mark Nahnsen's National Provider Identifier (NPI) is 1831480128, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nahnsen's specialty?
- Mark Nahnsen is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Nahnsen located?
- Mark Nahnsen's practice location on file with NPPES is 339 Ohayo Mountain Rd, Woodstock, NY 12498-2519.
- What is Mark Nahnsen's phone number?
- The practice phone number listed in the NPPES registry for Mark Nahnsen is (845) 679-6429.
- Is Mark Nahnsen's NPI active?
- Yes — Mark Nahnsen's NPI (1831480128) is active in the NPPES registry as of the last update on 2011-04-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.