Julia Sun, M.D.
NPI 1235589912 · Rheumatology Physician · Lake Forest, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Julia Sun, M.D. is a Rheumatology Physician provider in Lake Forest, IL (NPI 1235589912).
Provider details
- NPI number
- 1235589912
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 125.068435 (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
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,275 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) |
|---|---|---|
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 254 | $15 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 155 | $9 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 155 | $66 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 130 | $135 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 105 | $96 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Each Additional Hour96366 | 96 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 104 | 46 |
| Hydroxychloroquine Sulfate | 90 | 35 |
| Methotrexate Sodiumbrand: Methotrexate | 68 | 30 |
| Allopurinol | 50 | 18 |
| Tramadol Hcl | 37 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 22 | — |
| Sulfasalazine |
Practice location
Mailing address
Additional practice locations (1)
- 5841 S Maryland AveM/C 7082Chicago, IL 60637-1447Phone: (773) 795-0232Fax: (773) 702-2230
Registry dates
- Enumerated
- 2016-06-14
- Last updated
- 2021-09-27
- Certified
- 2021-09-27
Frequently asked questions
- What is Julia Sun's NPI number?
- Julia Sun's National Provider Identifier (NPI) is 1235589912, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Julia Sun's specialty?
- Julia Sun is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Julia Sun located?
- Julia Sun's practice location on file with NPPES is 800 N Westmoreland Rd Ste 201, Lake Forest, IL 60045-1687.
- What is Julia Sun's phone number?
- The practice phone number listed in the NPPES registry for Julia Sun is (847) 388-0603.
- Does Julia Sun accept Medicare?
- Julia Sun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Julia Sun's NPI active?
- Yes — Julia Sun's NPI (1235589912) is active in the NPPES registry as of the last update on 2021-09-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.