FRANK TRIESTE GRASSI
NPI 1659342624
Internal Medicine - Critical Care Medicine in San Diego, CA
About Frank Trieste Grassi NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
FRANK TRIESTE GRASSI (NPI 1659342624) is an individual critical care medicine provider in San Diego, California, licensed in California (C52598) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of Tulane University School Of Medicine (1997).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Frank Trieste Grassi is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Frank Grassi reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Diego, CA 92123
- Reassigned Medicare billing, California enrollment
- 1,437 clinicians in this Medicare group
San Diego, CA 92123
- Reassigned Medicare billing, California enrollment
- 50 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92123 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN DIEGO, CA 92123
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Frank Grassi's NPI number?
The NPI number for Frank Grassi is 1659342624. It was assigned to this individual provider in the NPPES registry on January 30, 2006.
Where is Frank Grassi located?
Frank Grassi practices at 7901 Frost St, San Diego, CA 92123. The listed phone number is (858) 939-3411.
What is Frank Grassi's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Frank Grassi enrolled in Medicare?
Yes. Frank Grassi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Frank Grassi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Frank Grassi reassigns Medicare benefits to 2 organizations: Emergency And Acute Care Medical Corporation (San Diego, CA) and Chest Medicine And Critical Care Medical Group, Inc. (San Diego, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Frank Grassi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Frank Grassi was last updated on March 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Frank Trieste Grassi · NPI 1659342624
Critical Care Medicine physician in San Diego, California. Individual provider, active in the CMS NPPES registry since January 30, 2006.
## Identity
- **NPI:** 1659342624 (Entity type: Individual)
- **Enumerated:** January 30, 2006
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** C52598 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 7901 FROST ST, San Diego, CA 92123-2701
- **Phone:** (858) 939-3411
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Emergency And Acute Care Medical Corporation (NPI 1437103942, San Diego, CA); Chest Medicine And Critical Care Medical Group, Inc. (NPI 1841292521, San Diego, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tulane University School Of Medicine, class of 1997
## Record status
- **NPPES last updated:** March 30, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1659342624) · Data from the CMS NPPES public registry.