Maria Chou, MD
NPI 1689738452 · Rheumatology Physician · Reston, VA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Maria Chou, MD is a Rheumatology Physician provider in Reston, VA (NPI 1689738452).
Provider details
- NPI number
- 1689738452
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 0101233943 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
3,143 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 606 | $147 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 412 | $203 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 301 | $19 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 227 | $8 |
| Aspiration And/Or Injection of Fluid Large Joint Using Ultrasound Guidance20611 | 221 | $141 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 245 | 68 |
| Prednisone | 164 | 39 |
| Hydroxychloroquine Sulfate | 142 | 41 |
| Allopurinol | 136 | 37 |
| Meloxicam | 109 | 35 |
| Alendronate Sodium | 80 | 31 |
| Gabapentin | 65 | 20 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$990 across 50 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-19
- Last updated
- 2017-03-23
Frequently asked questions
- What is Maria Chou's NPI number?
- Maria Chou's National Provider Identifier (NPI) is 1689738452, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maria Chou's specialty?
- Maria Chou is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Maria Chou located?
- Maria Chou's practice location on file with NPPES is 1860 Town Center Dr, Reston, VA 20190-5896.
- What is Maria Chou's phone number?
- The practice phone number listed in the NPPES registry for Maria Chou is (703) 709-9174.
- Does Maria Chou accept Medicare?
- Maria Chou is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Maria Chou's NPI active?
- Yes — Maria Chou's NPI (1689738452) is active in the NPPES registry as of the last update on 2017-03-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.