Melissa Williamson, CADCI
NPI 1184822033 · Addiction (Substance Use Disorder) Counselor · Oregon City, OR
Melissa Williamson, CADCI is a Addiction (Substance Use Disorder) Counselor provider in Oregon City, OR (NPI 1184822033).
Provider details
- NPI number
- 1184822033
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- CADCI
- Sex
- Female
- Sole proprietor
- No
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
18 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2007-07-03
- Last updated
- 2007-07-08
Frequently asked questions
- What is Melissa Williamson's NPI number?
- Melissa Williamson's National Provider Identifier (NPI) is 1184822033, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Melissa Williamson's specialty?
- Melissa Williamson is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Melissa Williamson located?
- Melissa Williamson's practice location on file with NPPES is 998 Library Ct, Oregon City, OR 97045-4041.
- What is Melissa Williamson's phone number?
- The practice phone number listed in the NPPES registry for Melissa Williamson is (503) 655-8401.
- Is Melissa Williamson's NPI active?
- Yes — Melissa Williamson's NPI (1184822033) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.