Charles Waller, PSY.D.
NPI 1659866556 · Clinical Psychologist · Fairfax, VA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Waller, PSY.D. is a Clinical Psychologist provider in Fairfax, VA (NPI 1659866556).
Provider details
- NPI number
- 1659866556
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Mental Health Counselor101YM0800X
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
104 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Psychotherapy, 45 Minutes90834 | 69 | $105 |
| Psychotherapy, 30 Minutes90832 | 19 | $78 |
| Psychiatric Diagnostic Evaluation90791 | 16 | $178 |
Typical Medicare-allowed amounts for these services range $78–$178 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 8140 Ashton Ave Ste 200Manassas, VA 20109-5701Phone: (703) 330-9933
Registry dates
- Enumerated
- 2018-06-25
- Last updated
- 2026-05-27
- Certified
- 2026-05-27
Frequently asked questions
- What is Charles Waller's NPI number?
- Charles Waller's National Provider Identifier (NPI) is 1659866556, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Waller's specialty?
- Charles Waller is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Charles Waller located?
- Charles Waller's practice location on file with NPPES is 8221 Willow Oaks Corporate Dr, Fairfax, VA 22031-4512.
- What is Charles Waller's phone number?
- The practice phone number listed in the NPPES registry for Charles Waller is (703) 559-3000.
- Does Charles Waller accept Medicare?
- Charles Waller is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Waller's NPI active?
- Yes — Charles Waller's NPI (1659866556) is active in the NPPES registry as of the last update on 2026-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.