John Slack, OTR/L
NPI 1659542744 · Occupational Therapist · Spokane, WA
John Slack, OTR/L is a Occupational Therapist provider in Spokane, WA (NPI 1659542744).
Provider details
- NPI number
- 1659542744
- Entity type
- Individual
- Primary specialty
- Occupational TherapistRespiratory, Developmental, Rehabilitative and Restorative Service Providers
- Credential
- OTR/L
- Sex
- Male
- Sole proprietor
- No
- License
- OT00004359 (WA)
Specialties & taxonomies
Respiratory, Developmental, Rehabilitative and Restorative 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
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
- 2008-03-17
- Last updated
- 2011-09-02
Frequently asked questions
- What is John Slack's NPI number?
- John Slack's National Provider Identifier (NPI) is 1659542744, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Slack's specialty?
- John Slack is listed in the NPPES registry with a primary specialty of Occupational Therapist (Respiratory, Developmental, Rehabilitative and Restorative Service Providers).
- Where is John Slack located?
- John Slack's practice location on file with NPPES is 605 E Holland Ave, Spokane, WA 99218-2225.
- What is John Slack's phone number?
- The practice phone number listed in the NPPES registry for John Slack is (509) 838-2531.
- Is John Slack's NPI active?
- Yes — John Slack's NPI (1659542744) is active in the NPPES registry as of the last update on 2011-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.