EVAN MARSHALL GREGG MD
NPI 1386207231
Psychiatry & Neurology - Psychiatry in Jb Andrews, MD
NPI Status: Active since April 17, 2019
Contact Information
1060 W PERIMETER RD
JB ANDREWS, MD
ZIP 20762
Phone: (888) 999-1212
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
NPPES record last updated: June 29, 2026. Verified against the NPPES registry weekly; last sync: July 12, 2026.
Record update history: Jan 13, 2021, Apr 17, 2019 (2 updates tracked since 2019).
- Individual
- Male
- Psychiatry & Neurology
- Psychiatry
About EVAN GREGG
This page provides the complete NPI Profile along with additional information for Evan Gregg, a provider established in Jb Andrews, Maryland with a medical specialization in Psychiatry & Neurology, focusing in psychiatry . The healthcare provider is registered in the NPI registry with number 1386207231 assigned on April 2019. The practitioner's primary taxonomy code is 2084P0800X with license number 0101271212 (VA). The provider is registered as an individual and his NPI record was last updated June 2026.
- NPI
- 1386207231
- Provider Name
- EVAN MARSHALL GREGG MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1060 W PERIMETER RD JB ANDREWS, MD 20762
- Location Phone
- (888) 999-1212
- Mailing Address
- 1060 W PERIMETER RD JB ANDREWS, MD 20762
- Mailing Phone
- (888) 999-1212
- Is Sole Proprietor?
- No
- Enumeration Date
- 04-17-2019
- Last Update Date
- 06-29-2026
- Code Navigator
A psychiatrist like Evan Gregg are primary mental health physicians diagnose and treat mental illnesses through psychotherapy, psychoanalysis, hospitalization and medication. Psychiatrist help patients find solutions through changes in their behavioral patterns, explorations of experiences, group and family therapy.
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
Psychiatry & Neurology Psychiatry
- Taxonomy Code
- 2084P0800X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 0101271212
- License State
- VA
- Taxonomy Description
- A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
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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 1386207231, we treat the final digit (1) 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 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 1).
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 59 is 60. 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.
ANDREWS AFB, MD 20762
JB ANDREWS, MD 20762
JB ANDREWS, MD 20762
JB ANDREWS, MD 20762
JB ANDREWS, MD 20762
JB ANDREWS, MD 20762
JB ANDREWS, MD 20762
JB ANDREWS, MD 20762
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1386207231, enumerated as an "individual" on April 17, 2019.
The provider is located at 1060 W PERIMETER RD JB ANDREWS, MD 20762 and the phone number is (888) 999-1212.
Psychiatry & Neurology with taxonomy code 2084P0800X and a focus in Psychiatry.
