Mathew Kosik, LMSW, CAADC
NPI 1336428879 · Clinical Social Worker · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mathew Kosik, LMSW, CAADC is a Clinical Social Worker provider in Grand Rapids, MI (NPI 1336428879).
Provider details
- NPI number
- 1336428879
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LMSW, CAADC
- Sex
- Male
- Sole proprietor
- No
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 tenure28% of score
14 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
67 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Psychotherapy, 45 Minutes90834 | 67 | $69 |
Typical Medicare-allowed amounts for these services range $69–$69 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-08-16
- Last updated
- 2025-08-20
- Certified
- 2025-08-20
Frequently asked questions
- What is Mathew Kosik's NPI number?
- Mathew Kosik's National Provider Identifier (NPI) is 1336428879, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mathew Kosik's specialty?
- Mathew Kosik is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mathew Kosik located?
- Mathew Kosik's practice location on file with NPPES is 300 68th St Se, Grand Rapids, MI 49548-6927.
- What is Mathew Kosik's phone number?
- The practice phone number listed in the NPPES registry for Mathew Kosik is (616) 559-5896.
- Does Mathew Kosik accept Medicare?
- Mathew Kosik is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mathew Kosik's NPI active?
- Yes — Mathew Kosik's NPI (1336428879) is active in the NPPES registry as of the last update on 2025-08-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.