Nathaniel Grassi, MS
NPI 1881371615 · Mental Health Counselor · Jacksonville, FL
Nathaniel Grassi, MS is a Mental Health Counselor provider in Jacksonville, FL (NPI 1881371615).
Provider details
- NPI number
- 1881371615
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Credential
- MS
- Sex
- Female
- Sole proprietor
- No
- License
- MH25377 (FL)
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
2 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 820 Prudential Dr Ste 510Jacksonville, FL 32207-8207Phone: (904) 376-3800
Registry dates
- Enumerated
- 2023-07-03
- Last updated
- 2026-04-27
- Certified
- 2026-04-27
Frequently asked questions
- What is Nathaniel Grassi's NPI number?
- Nathaniel Grassi's National Provider Identifier (NPI) is 1881371615, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathaniel Grassi's specialty?
- Nathaniel Grassi is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Nathaniel Grassi located?
- Nathaniel Grassi's practice location on file with NPPES is 836 Prudential Dr Ste 1507, Jacksonville, FL 32207-8342.
- What is Nathaniel Grassi's phone number?
- The practice phone number listed in the NPPES registry for Nathaniel Grassi is (904) 376-3800.
- Is Nathaniel Grassi's NPI active?
- Yes — Nathaniel Grassi's NPI (1881371615) is active in the NPPES registry as of the last update on 2026-04-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.