DAVID ALLAN WILLIAMSON M.B., CH.B.
NPI 1215183512
Psychiatry & Neurology - Brain Injury Medicine in Bethesda, MD
NPI Status: Active since August 18, 2008
Contact Information
WALTER REED NATIONAL MILITARY CTR
8901 ROCKVILLE PIKE
BETHESDA, MD
ZIP 20889
Phone: (301) 295-1928
Fax: (410) 571-0625
- Individual
- Male
- Psychiatry & Neurology
- Brain Injury Medicine
- PECOS Enrolled
About DAVID WILLIAMSON
This page provides the complete NPI Profile along with additional information for David Williamson, a provider established in Bethesda, Maryland with a medical specialization in Psychiatry & Neurology, focusing in brain injury medicine . The healthcare provider is registered in the NPI registry with number 1215183512 assigned on August 2008. The practitioner's primary taxonomy code is 2084P0301X with license number R0977 (TX). The provider is registered as an individual and his NPI record was last updated February 2026.
- NPI
- 1215183512
- Provider Name
- DAVID ALLAN WILLIAMSON M.B., CH.B.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- WALTER REED NATIONAL MILITARY CTR 8901 ROCKVILLE PIKE BETHESDA, MD 20889
- Location Phone
- (301) 295-1928
- Location Fax
- (410) 571-0625
- Mailing Address
- 8901 ROCKVILLE PIKE BETHESDA, MD 20889
- Mailing Phone
- (410) 463-0560
- Is Sole Proprietor?
- No
- Enumeration Date
- 08-18-2008
- Last Update Date
- 02-27-2026
- 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
Psychiatry & Neurology Brain Injury Medicine
- Taxonomy Code
- 2084P0301X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- R0977
- License State
- TX
- Taxonomy Description
- A Brain Injury Medicine physician specializes in disorders of brain function due to injury and disease. These disorders encompass a range of medical, physical, neurologic, cognitive, sensory, and behavioral disorders that result in psychosocial, educational, and vocational consequences.
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 | 2084B0040X | Allopathic & Osteopathic Physicians | Psychiatry & Neurology | R0977 (TX) |
| 2 | 2084B0040X | Allopathic & Osteopathic Physicians | Psychiatry & Neurology | D43756 (MD) |
| 3 | 2084P0301X | Allopathic & Osteopathic Physicians | Psychiatry & Neurology | D43756 (TX) |
Medicare Participation & PECOS Enrollment Status
David Williamson 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
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
Reviews for DAVID ALLAN WILLIAMSON M.B., CH.B.
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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 1215183512, we treat the final digit (2) 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 58. The final step is to find the difference between that total and the next multiple of ten (60 - 58 = 2).
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 58 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.
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
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BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1215183512, enumerated as an "individual" on August 18, 2008.
The provider is located at WALTER REED NATIONAL MILITARY CTR 8901 ROCKVILLE PIKE BETHESDA, MD 20889 and the phone number is (301) 295-1928.
Psychiatry & Neurology with taxonomy code 2084P0301X and a focus in Brain Injury Medicine.
