Frank T Grassi M.D.
NPI 1649320821 · Critical Care Medicine (Internal Medicine) Physician · San Diego, CA
Frank T Grassi M.D. is a Critical Care Medicine (Internal Medicine) Physician organization in San Diego, CA (NPI 1649320821).
Provider details
- NPI number
- 1649320821
- Entity type
- Organization
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Melissa Miller, Medical Biller(619) 299-2570
Specialties & taxonomies
Allopathic & Osteopathic Physicians
- Pulmonary Disease Physician207RP1001X
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
- 2007-01-11
- Last updated
- 2025-09-11
Frequently asked questions
- What is Frank T Grassi M.D.'s NPI number?
- Frank T Grassi M.D.'s National Provider Identifier (NPI) is 1649320821, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Frank T Grassi M.D.?
- Frank T Grassi M.D. is classified in the NPPES registry as Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Frank T Grassi M.D. located?
- Frank T Grassi M.D.'s practice location on file with NPPES is 4033 3rd Ave Ste 300, San Diego, CA 92103-2138.
- What is Frank T Grassi M.D.'s phone number?
- The practice phone number listed in the NPPES registry for Frank T Grassi M.D. is (619) 299-2570.
- Who is the authorized official for Frank T Grassi M.D.?
- The authorized official listed on Frank T Grassi M.D.'s NPPES record is Melissa Miller, Medical Biller. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Frank T Grassi M.D.'s NPI active?
- Yes — Frank T Grassi M.D.'s NPI (1649320821) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.