Mark Devries, PH.D.
NPI 1265476220 · Clinical Neuropsychologist · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Devries, PH.D. is a Clinical Neuropsychologist provider in Grand Rapids, MI (NPI 1265476220).
Provider details
- NPI number
- 1265476220
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 6301008596 (MI)
Specialties & taxonomies
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
74 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) |
|---|---|---|
| Evaluation of Neuropsychological Test, Each Additional Hour96133 | 44 | $93 |
| Psychiatric Diagnostic Evaluation90791 | 17 | $165 |
| Evaluation of Neuropsychological Test, First Hour96132 | 13 | $123 |
Typical Medicare-allowed amounts for these services range $93–$165 (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
Additional practice locations (1)
- 30 Jefferson Ave SeGrand Rapids, MI 49503-4304Phone: (616) 303-1313
Registry dates
- Enumerated
- 2006-06-16
- Last updated
- 2026-02-23
- Certified
- 2026-02-23
Frequently asked questions
- What is Mark Devries's NPI number?
- Mark Devries's National Provider Identifier (NPI) is 1265476220, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Devries's specialty?
- Mark Devries is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is Mark Devries located?
- Mark Devries's practice location on file with NPPES is 300 68th St Se, Grand Rapids, MI 49548-6927.
- What is Mark Devries's phone number?
- The practice phone number listed in the NPPES registry for Mark Devries is (616) 455-5000.
- Does Mark Devries accept Medicare?
- Mark Devries is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Devries's NPI active?
- Yes — Mark Devries's NPI (1265476220) is active in the NPPES registry as of the last update on 2026-02-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.