MATTHEW SCOTT HOWLETT MD
NPI 1649039066
Radiology - Vascular & Interventional Radiology in San Francisco, CA
NPI Status: Active since March 18, 2024
Contact Information
400 PARNASSUS AVE
SAN FRANCISCO, CA
ZIP 94143
Phone: (415) 476-1000
- Individual
- Male
- Radiology
- Vascular & Interventional Radiology
About MATTHEW HOWLETT
This page provides the complete NPI Profile along with additional information for Matthew Howlett, a provider established in San Francisco, California with a medical specialization in Radiology, focusing in vascular & interventional radiology . The healthcare provider is registered in the NPI registry with number 1649039066 assigned on March 2024. The practitioner's primary taxonomy code is 2085R0204X with license number 2087584 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1649039066
- Provider Name
- MATTHEW SCOTT HOWLETT MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 400 PARNASSUS AVE SAN FRANCISCO, CA 94143
- Location Phone
- (415) 476-1000
- Mailing Address
- 2130 POST ST APT 311 SAN FRANCISCO, CA 94115
- Mailing Phone
- (916) 293-1903
- Is Sole Proprietor?
- No
- Enumeration Date
- 03-18-2024
- Last Update Date
- 08-14-2025
- Code Navigator
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
Radiology Vascular & Interventional Radiology
- Taxonomy Code
- 2085R0204X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 2087584
- License State
- CA
- Taxonomy Description
- A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tomography, sonography and magnetic resonance imaging.
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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 1649039066, we treat the final digit (6) 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 64. The final step is to find the difference between that total and the next multiple of ten (70 - 64 = 6).
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 64 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1649039066, enumerated as an "individual" on March 18, 2024.
The provider is located at 400 PARNASSUS AVE SAN FRANCISCO, CA 94143 and the phone number is (415) 476-1000.
Radiology with taxonomy code 2085R0204X and a focus in Vascular & Interventional Radiology.
