Tatiana Grelli
NPI 1255792669 · Addiction (Substance Use Disorder) Counselor · San Mateo, CA
Tatiana Grelli is a Addiction (Substance Use Disorder) Counselor provider in San Mateo, CA (NPI 1255792669).
Provider details
- NPI number
- 1255792669
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- 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
10 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
- 2016-03-11
- Last updated
- 2016-03-11
Frequently asked questions
- What is Tatiana Grelli's NPI number?
- Tatiana Grelli's National Provider Identifier (NPI) is 1255792669, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tatiana Grelli's specialty?
- Tatiana Grelli is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Tatiana Grelli located?
- Tatiana Grelli's practice location on file with NPPES is 2015 Pioneer Ct Ste B, San Mateo, CA 94403-1736.
- What is Tatiana Grelli's phone number?
- The practice phone number listed in the NPPES registry for Tatiana Grelli is (650) 348-6603.
- Is Tatiana Grelli's NPI active?
- Yes — Tatiana Grelli's NPI (1255792669) is active in the NPPES registry as of the last update on 2016-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.