NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1033536735 M.D.
Verify on CMS → Robert Chao, M.D.
Rheumatology Physician in Tysons, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,181 in Rheumatology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
581
Medicare Part D claims · 108 beneficiaries · Rheumatology Physician avg: 2K
MIPS score
81.3/100
▼ 2 pts below national avg 83.1 · Above neutral
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Robert Chao, M.D. reported a CMS MIPS final score of 81.3/100 - below the 83.1 national average - and filed 581 Medicare Part D claims in 2023.
- 81.3/100
- MIPS score · -2 vs avg
- 581
- Part D claims, 2023
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Robert Chao, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
81 36th percentile higher than 36% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Robert Chao, M.D. sits
This provider among rheumatology physician peers
Across the 2,181 rheumatology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Robert Chao, M.D. writes more Part D claims than 14% of them and scores higher on MIPS quality than 39% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one rheumatology physician peer from a representative sample of 60; the gold marker is Robert Chao, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Robert Chao, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Robert Chao, M.D.?
Near national averagePrimary specialty
Rheumatology Physician
Medicare Part D claims
581 72% vs specialty avg
MIPS final score
81.3/100 1.8 pts vs avg
Specialty distribution in Virginia
How Rheumatology Physician compares to other specialties among Virginia providers
Medicare quality performance, MIPS
Robert Chao, M.D.'s 2023 MIPS final score plotted against the Rheumatology Physician national average
- MIPS Final Score
- 81.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Rheumatology Physician) - 81.3/100 vs national avg 83.1
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Robert Chao, M.D. appears in the CMS NPPES registry as a Rheumatology Physician provider holding M.D. credentials at 8100 BOONE BLVD STE 700, Tysons, VA, 22182, with a listed phone of (571) 423-5699. NPI 1033536735 was issued on 03/20/2014.
Medicare Part D records for calendar year 2023 show 581 prescription claims written by this provider, covering 108 Medicare beneficiaries and totaling roughly $620K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 81.3/100 for the 2023 performance year (Quality 70.8, Cost 66.8), compared with the national average of 83.1.
Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1033536735 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/20/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
81.283
Final Score
Avg: 83.1
70.77
Quality
66.84
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Robert Chao, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Inova Health Care Services
Falls Church, VA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
581
Total Claims
$620K
Total Drug Cost
108
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,105
- Total Day Supply
- 32,440
- Generic Drug Cost
- $20K
Patient Demographics
- Average Patient Age
- 70.5 years
- Avg HCC Risk Score
- 1.56
- Gender Split
- 69% female / 31% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Robert Chao, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
152 claims
- Prednisone
Prednisone
84 claims
- Methotrexate
Methotrexate
72 claims
- Allopurinol 31
Allopurinol
31 claims
- Alendronate Sodium 25
Alendronate Sodium
25 claims
- Leflunomide 23
Leflunomide
23 claims
- Meloxicam 19
Meloxicam
19 claims
- Simponi 14
Simponi
14 claims
| Drug | Claims |
|---|---|
| Hydroxychloroquine Sulfate | 152 |
| Prednisone | 84 |
| Methotrexate Methotrexate Sodium | 72 |
| Allopurinol | 31 |
| Alendronate Sodium | 25 |
| Leflunomide | 23 |
| Meloxicam | 19 |
| Simponi Golimumab | 14 |
| Actemra Tocilizumab | 13 |
| Folic Acid | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Robert Chao, M.D. fits within the Rheumatology Physician landscape nationally.
6,181
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
Robert Chao, M.D.'s 581 claims are below the specialty average of 2,054.
Nearby Rheumatology Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Chao.
Dr. Romy Abou Mrad
MD
Harrisonburg, VA
Dr. Claude Abujrab-Saba
M.D.
Reston, VA
Dr. Gold Adkins
MD
Charlottesville, VA
Dr. Navera Ahmed
M. D.
Falls Church, VA
Dr. Avnit Ahuja
MD
Richmond, VA
Compare Rheumatology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Virginia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Rheumatology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Robert Chao, M.D.'s specialty? ▼
Robert Chao, M.D. specializes in Rheumatology Physician and practices in Tysons, Virginia. Credentials: M.D..
How much does Robert Chao, M.D. prescribe under Medicare Part D? ▼
In 2023, Robert Chao, M.D. wrote 581 Medicare Part D claims totaling $620K in drug costs for 108 beneficiaries.
What is Robert Chao, M.D.'s Medicare quality score? ▼
Robert Chao, M.D. has a CMS MIPS Final Score of 81.3/100 (Quality: 70.8, Cost: 66.8). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Robert Chao, M.D. located? ▼
Robert Chao, M.D. is located at 8100 BOONE BLVD STE 700, Tysons, VA, 22182. Phone: (571) 423-5699.
What is Robert Chao, M.D.'s NPI number? ▼
Robert Chao, M.D.'s National Provider Identifier (NPI) is 1033536735, issued on 03/20/2014.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,181 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does Robert Chao, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Chao, M.D.'s most frequently prescribed drugs include Hydroxychloroquine Sulfate, Prednisone, Methotrexate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Chao, M.D. accept Medicare? ▼
Robert Chao, M.D. appears in CMS Medicare data with 581 Part D claims and 108 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Chao, M.D.'s credentials? ▼
Robert Chao, M.D.'s NPI is 1033536735 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.