FRANK TRIESTE GRASSI
NPI 1659342624
Internal Medicine - Critical Care Medicine in San Diego, CA
NPI Status: Active since January 30, 2006
Contact Information
7901 FROST ST
SAN DIEGO, CA
ZIP 92123
Phone: (858) 939-3411
- Individual
- Male
- Years of Experience 30
- Internal Medicine
- Critical Care Medicine
- Accepts Medicare Approved Payment
- PECOS Enrolled
- Medicare Quality Reporting
About FRANK GRASSI
This page provides the complete NPI Profile along with additional information for Frank Grassi, an internist established in San Diego, California with a medical specialization in Internal Medicine, focusing in critical care medicine and more than 30 years of experience. He graduated from Tulane University School Of Medicine in 1997. The healthcare provider is registered in the NPI registry with number 1659342624 assigned on January 2006. The practitioner's primary taxonomy code is 207RC0200X with license number C52598 (CA). The provider is registered as an individual and his NPI record was last updated March 2026.
- NPI
- 1659342624
- Provider Name
- FRANK TRIESTE GRASSI
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 7901 FROST ST SAN DIEGO, CA 92123
- Location Phone
- (858) 939-3411
- Mailing Address
- 8555 AERO DR STE 104 SAN DIEGO, CA 92123
- Mailing Phone
- (858) 650-5036
- Mailing Fax
- Medical School Name
- TULANE UNIVERSITY SCHOOL OF MEDICINE
- Graduation Year
- 1997
- Is Sole Proprietor?
- No
- Enumeration Date
- 01-30-2006
- Last Update Date
- 03-30-2026
- Code Navigator
An internist like Frank Grassi is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Internal Medicine Critical Care Medicine
- Taxonomy Code
- 207RC0200X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- C52598
- License State
- CA
- Taxonomy Description
- An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
Medicare Participation & PECOS Enrollment Status
Frank Grassi is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.
Frank Grassi is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
PECOS PAC ID: 3476656323
What is the PECOS Associate Control ID?
A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.PECOS Enrollment ID: I20070313000579
What is the Provider Enrollment ID?
The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.Accepts Medicare Assignment? Yes
What does it mean "accepts medicare assignment"?
When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Critical care, first 30-74 minutes
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
This service was performed 19 times for 19 patientsPhysician Visit Costs
The typical physician office visit costs for Medicare beneficiaries in this area are: $35.05 for a new patient copayment and $27.1 for an established patient copayment.
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 92123 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $140.22
- Minimum New Patient Price $62.1
- Maximum New Patient Price $184.71
- Average New Patient Copayment $35.05
- Minimum New Patient Copayment $15.52
- Maximum New Patient Copayment $46.17
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $108.42
- Minimum Established Patient Price $20.62
- Maximum Established Patient Price $151.42
- Average Established Patient Copayment $27.1
- Minimum Established Patient Copayment $5.15
- Maximum Established Patient Copayment $37.85
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
Quality Reporting
The provider participated in CMS Quality Payment Program. The Quality Payment Program aims to improve population health, reduce costs and improve the care received by Medicare beneficiaries. The following quality measures meet Medicare's statistical reporting standards. Not all providers report the same information, because not all providers give the same services to patients. The quality information is just a snapshot of some the care providers give to their patients. Reporting more or less information is not a reflection of quality.
| Quality Measure | Performance | Number of Patients |
|---|---|---|
| Breast Cancer Screening | 55% | 185 |
| Percentage of women 50-74 years of age who had a mammogram to screen for breast cancer | ||
| Collection and follow-up on patient experience and satisfaction data on beneficiary engagement | Yes | N/A |
| Collection and follow-up on patient experience and satisfaction data on beneficiary engagement, including development of improvement plan. | ||
| Colorectal Cancer Screening | 58% | 374 |
| Percentage of adults 50-75 years of age who had appropriate screening for colorectal cancer | ||
| Documentation of Current Medications in the Medical Record | 81% | 1561 |
| Percentage of visits for patients aged 18 years and older for which the eligible professional or eligible clinician attests to documenting a list of current medications using all immediate resources available on the date of the encounter. This list must include ALL known prescriptions, over-the-counters, herbals, and vitamin/mineral/dietary (nutritional) supplements AND must contain the medications' name, dosage, frequency and route of administration | ||
| Implementation of formal quality improvement methods, practice changes, or other practice improvement processes | Yes | N/A |
| Adopt a formal model for quality improvement and create a culture in which all staff actively participates in improvement activities that could include one or more of the following such as: • Multi-Source Feedback; • Train all staff in quality improvement methods; • Integrate practice change/quality improvement into staff duties; • Engage all staff in identifying and testing practices changes; • Designate regular team meetings to review data and plan improvement cycles; • Promote transparency and accelerate improvement by sharing practice level and panel level quality of care, patient experience and utilization data with staff; and/or • Promote transparency and engage patients and families by sharing practice level quality of care, patient experience and utilization data with patients and families, including activities in which clinicians act upon patient experience data. | ||
| Pneumococcal Vaccination Status for Older Adults | 5% | 531 |
| Percentage of patients 65 years of age and older who have ever received a pneumococcal vaccine | ||
| Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan | 58% | 685 |
| Percentage of patients aged 18 years and older with a BMI documented during the current encounter or during the previous twelve months AND with a BMI outside of normal parameters, a follow-up plan is documented during the encounter or during the previous twelve months of the current encounter Normal Parameters: Age 18 years and older BMI >= 18.5 and < 25 kg/m2 | ||
| Preventive Care and Screening: Influenza Immunization | 2% | 416 |
| Percentage of patients aged 6 months and older seen for a visit between October 1 and March 31 who received an influenza immunization OR who reported previous receipt of an influenza immunization | ||
| Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention | 66% | 29 |
| Percentage of patients aged 18 years and older who were screened for tobacco use one or more times within 24 months AND who received tobacco cessation intervention if identified as a tobacco user | ||
| Use of Patient Safety Tools | Yes | N/A |
| Use of tools that assist specialty practices in tracking specific measures that are meaningful to their practice, such as use of a surgical risk calculator, evidence based protocols such as Enhanced Recovery After Surgery (ERAS) protocols, the CDC Guide for Infection Prevention for Outpatient Settings, (https://www.cdc.gov/hai/settings/outpatient/outpatient-care-guidelines.html), predictive algorithms, or other such tools. | ||
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NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1659342624, we treat the final digit (4) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 66 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 19 providers are registered at the same or a nearby location.
SAN DIEGO, CA 92123
SAN DIEGO, CA 92123
SAN DIEGO, CA 92123
SAN DIEGO, CA 92123
SAN DIEGO, CA 92123
SAN DIEGO, CA 92123
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1659342624, enumerated as an "individual" on January 30, 2006.
The provider is located at 7901 FROST ST SAN DIEGO, CA 92123 and the phone number is (858) 939-3411.
Internal Medicine with taxonomy code 207RC0200X and a focus in Critical Care Medicine.
