Bob Sun, M.D.
NPI 1679657944 · Rheumatology Physician · Evanston, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Bob Sun, M.D. is a Rheumatology Physician provider in Evanston, IL (NPI 1679657944).
Provider details
- NPI number
- 1679657944
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036118325 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,575 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 | 380 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 334 | $102 |
| 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 | 314 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 277 | $102 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 301 | 94 |
| Methotrexate Sodiumbrand: Methotrexate | 239 | 70 |
| Hydroxychloroquine Sulfate | 235 | 75 |
| Allopurinol | 180 | 47 |
| Alendronate Sodium | 85 | 30 |
| Colchicine | 68 | 23 |
| Tramadol Hcl | 66 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-24
- Last updated
- 2021-02-10
- Certified
- 2021-02-10
Frequently asked questions
- What is Bob Sun's NPI number?
- Bob Sun's National Provider Identifier (NPI) is 1679657944, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Bob Sun's specialty?
- Bob Sun is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Bob Sun located?
- Bob Sun's practice location on file with NPPES is 1000 Central St Ste 800, Evanston, IL 60201-1780.
- What is Bob Sun's phone number?
- The practice phone number listed in the NPPES registry for Bob Sun is (847) 570-2503.
- Does Bob Sun accept Medicare?
- Bob Sun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Bob Sun's NPI active?
- Yes — Bob Sun's NPI (1679657944) is active in the NPPES registry as of the last update on 2021-02-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.