Physician Profile
Unclaimed ProfileAbout DECKER
Willaim Allen Decker, PhD is a clinical psychologist practising in Alexandria, VA. Willaim is also listed as specialising in psychologist and psychologist — clinical.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Decker's specialty?
Dr. Decker is a clinical psychologist in Alexandria, VA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CLINICAL PSYCHOLOGIST”.
NPI registry
Where can I find Dr. Decker?
Dr. Decker is listed at 1423 POWHATAN ST SUITE 8, Alexandria, VA 22314. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Decker?
The number on file is (703) 836-3678. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Decker's NPI number?
Dr. Decker's National Provider Identifier is 1033234950. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Decker's medical education?
Dr. Decker attended Other, graduating in 1975. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Decker been practising?
Dr. Decker has 51 years experience. Calculated from a graduation year of 1975, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Decker known for?
According to Medicare billing data, Dr. Decker provides treatments such as psychotherapy, 1 hour and psychotherapy, 30 minutes. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Decker confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Decker. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (703) 836-3678
- Email not available
Practice Locations
1423 POWHATAN ST SUITE 8
Alexandria, VA 22314
Procedures Most Often Billed to Medicare
797 services · 51 patients · 3 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Psychotherapy, 1 hour | Treatment | 90837 |
646 |
| Psychotherapy, 30 minutes | Treatment | 90832 |
82 |
| Psychotherapy, 45 minutes | Treatment | 90834 |
69 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other clinical psychologists in Alexandria 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1975 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Psychotherapy, 1 hour 8
Providers in VA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.