DR. THOMAS WELCH GROSS M.D.
NPI 1174745525
Emergency Medicine in Vallejo, CA
NPI Status: Active since May 03, 2007
Contact Information
EMERGENCY DEPT., KAISER PERMANENTE MEDICAL CENTER
675 SERENO DR
VALLEJO, CA
ZIP 94589
Phone: (707) 651-4910
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Emergency Medicine
About THOMAS GROSS
This page provides the complete NPI Profile along with additional information for Thomas Gross, a provider established in Vallejo, California with a medical specialization in Emergency Medicine. The healthcare provider is registered in the NPI registry with number 1174745525 assigned on May 2007. The practitioner's primary taxonomy code is 207P00000X with license number G65532 (CA). The provider is registered as an individual and his NPI record was last updated May 2026.
- NPI
- 1174745525
- Provider Name
- DR. THOMAS WELCH GROSS M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- EMERGENCY DEPT., KAISER PERMANENTE MEDICAL CENTER 675 SERENO DR VALLEJO, CA 94589
- Location Phone
- (707) 651-4910
- Mailing Address
- 9636 CHERRY RIDGE RD SEBASTOPOL, CA 95472
- Mailing Phone
- (707) 829-7027
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 05-03-2007
- Last Update Date
- 05-31-2026
- 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
Emergency Medicine
- Taxonomy Code
- 207P00000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G65532
- License State
- CA
- Taxonomy Description
- An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
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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 1174745525, we treat the final digit (5) 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 55. The final step is to find the difference between that total and the next multiple of ten (60 - 55 = 5).
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 55 is 60. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1174745525, enumerated as an "individual" on May 03, 2007.
The provider is located at EMERGENCY DEPT., KAISER PERMANENTE MEDICAL CENTER 675 SERENO DR VALLEJO, CA 94589 and the phone number is (707) 651-4910.
Emergency Medicine with taxonomy code 207P00000X.
