DR. THOMAS WEST GREIG MD, MPH, MSIST
NPI 1104788017
Preventive Medicine - Aerospace Medicine in Oakton, VA
NPI Status: Active since November 29, 2025
Contact Information
11711 LARIAT LN
OAKTON, VA
ZIP 22124
Phone: (571) 265-9340
- Individual
- Male
- Preventive Medicine
- Aerospace Medicine
About THOMAS GREIG
This page provides the complete NPI Profile along with additional information for Thomas Greig, a provider established in Oakton, Virginia with a medical specialization in Preventive Medicine, focusing in aerospace medicine . The healthcare provider is registered in the NPI registry with number 1104788017 assigned on November 2025. The practitioner's primary taxonomy code is 2083A0100X with license number 037222 (GA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1104788017
- Provider Name
- DR. THOMAS WEST GREIG MD, MPH, MSIST
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 11711 LARIAT LN OAKTON, VA 22124
- Location Phone
- (571) 265-9340
- Mailing Address
- 11711 LARIAT LN OAKTON, VA 22124
- Mailing Phone
- (571) 265-9340
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 11-29-2025
- Last Update Date
- 11-29-2025
- 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
Preventive Medicine Aerospace Medicine
- Taxonomy Code
- 2083A0100X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 037222
- License State
- GA
- Taxonomy Description
- Aerospace medicine focuses on the clinical care, research, and operational support of the health, safety, and performance of crewmembers and passengers of air and space vehicles, together with the support personnel who assist operation of such vehicles. This population often works and lives in remote, isolated, extreme, or enclosed environments under conditions of physical and psychological stress. Practitioners strive for an optimal human-machine match in occupational settings rich with environmental hazards and engineering countermeasures.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 2083C0008X | Allopathic & Osteopathic Physicians | Preventive Medicine | 037222 (GA) |
| 2 | 2083P0500X | Allopathic & Osteopathic Physicians | Preventive Medicine | 037222 (GA) |
| 3 | 2083X0100X | Allopathic & Osteopathic Physicians | Preventive Medicine | 037222 (GA) |
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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 1104788017, we treat the final digit (7) 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 7).
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 53 is 60. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1104788017, enumerated as an "individual" on November 29, 2025.
The provider is located at 11711 LARIAT LN OAKTON, VA 22124 and the phone number is (571) 265-9340.
Preventive Medicine with taxonomy code 2083A0100X and a focus in Aerospace Medicine.
