Mark Holderbach, M.S.W., L.C.S.W.
NPI 1649397183 · Clinical Social Worker · Gresham, OR
Mark Holderbach, M.S.W., L.C.S.W. is a Clinical Social Worker provider in Gresham, OR (NPI 1649397183).
Provider details
- NPI number
- 1649397183
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- M.S.W., L.C.S.W.
- Sex
- Male
- Sole proprietor
- No
- License
- L3497 (OR)
Specialties & taxonomies
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
- 2007-03-22
- Last updated
- 2007-07-09
Frequently asked questions
- What is Mark Holderbach's NPI number?
- Mark Holderbach's National Provider Identifier (NPI) is 1649397183, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Holderbach's specialty?
- Mark Holderbach is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Holderbach located?
- Mark Holderbach's practice location on file with NPPES is 4101 Ne Division St, Gresham, OR 97030-4617.
- What is Mark Holderbach's phone number?
- The practice phone number listed in the NPPES registry for Mark Holderbach is (503) 666-6575.
- Is Mark Holderbach's NPI active?
- Yes — Mark Holderbach's NPI (1649397183) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.