Robert Chao, M.D.
NPI 1033536735 · Rheumatology Physician · Tysons, VA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Chao, M.D. is a Rheumatology Physician provider in Tysons, VA (NPI 1033536735).
Provider details
- NPI number
- 1033536735
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 0101269638 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
477 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) |
|---|---|---|
| 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 | 187 | $18 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 174 | $141 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 56 | $184 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 34 | $101 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 13 | $213 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 113 | 40 |
| Methotrexate Sodiumbrand: Methotrexate | 84 | 25 |
| Prednisone | 83 | 37 |
| Adalimumabbrand: Humira(cf) Pen | 33 | — |
| Allopurinol | 27 | — |
| Alendronate Sodium | 23 | — |
| Apremilastbrand: Otezla | 18 |
Practice location
Mailing address
Additional practice locations (4)
- 506 6th StBrooklyn, NY 11215-3609Phone: (240) 515-6592
- 8501 Arlington Blvd Ste 340Fairfax, VA 22031-4625Phone: (703) 259-9050Fax: (703) 259-9040
- 8501 Arlington Blvd Ste 340Fairfax, VA 22031-4625Phone: (702) 259-9050Fax: (703) 259-9040
- 3300 Gallows RdFalls Church, VA 22042-3300Phone: (703) 776-4001Fax: (703) 776-7113
Registry dates
- Enumerated
- 2014-03-20
- Last updated
- 2023-05-10
- Certified
- 2023-05-10
Frequently asked questions
- What is Robert Chao's NPI number?
- Robert Chao's National Provider Identifier (NPI) is 1033536735, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Chao's specialty?
- Robert Chao is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Chao located?
- Robert Chao's practice location on file with NPPES is 8100 Boone Blvd Ste 700, Tysons, VA 22182-2683.
- What is Robert Chao's phone number?
- The practice phone number listed in the NPPES registry for Robert Chao is (571) 423-5699.
- Does Robert Chao accept Medicare?
- Robert Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Chao's NPI active?
- Yes — Robert Chao's NPI (1033536735) is active in the NPPES registry as of the last update on 2023-05-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.