Frank Grassi
NPI 1659342624 · Critical Care Medicine (Internal Medicine) Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Frank Grassi is a Critical Care Medicine (Internal Medicine) Physician provider in San Diego, CA (NPI 1659342624).
Provider details
- NPI number
- 1659342624
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- C52598 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
27 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 27 | $213 |
Typical Medicare-allowed amounts for these services range $213–$213 (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
- 2006-01-30
- Last updated
- 2026-03-30
- Certified
- 2026-03-30
Frequently asked questions
- What is Frank Grassi's NPI number?
- Frank Grassi's National Provider Identifier (NPI) is 1659342624, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frank Grassi's specialty?
- Frank Grassi is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Frank Grassi located?
- Frank Grassi's practice location on file with NPPES is 7901 Frost St, San Diego, CA 92123-2701.
- What is Frank Grassi's phone number?
- The practice phone number listed in the NPPES registry for Frank Grassi is (858) 939-3411.
- Does Frank Grassi accept Medicare?
- Frank Grassi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Frank Grassi's NPI active?
- Yes — Frank Grassi's NPI (1659342624) is active in the NPPES registry as of the last update on 2026-03-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.