Quick answers
- Does Arthur M. Mandelin Ii accept Medicare assignment?
- Yes. Medicare's clinician data says Arthur M. Mandelin Ii accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Arthur M. Mandelin Ii see?
- In 2024, CMS data shows 556 Original Medicare patients and 98,760 services for Arthur M. Mandelin Ii. This counts Original Medicare only and measures volume, not quality.
- What is Arthur M. Mandelin Ii's NPI number?
- 1669655569. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Arthur M. Mandelin Ii, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 556 |
|---|---|
| Services billed to Medicare | 98,760 |
| Different services or procedures | 75 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Injection, tocilizumab, 1 mg (J3262)24,640 services
- Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use) (Q0138)13,770 services
- Injection, vedolizumab, intravenous, 1 mg (J3380)11,400 services
- Injection, golimumab, 1 mg, for intravenous use (J1602)10,600 services
- Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered) (J0129)7,625 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Arthritis73%
- High cholesterol71%
- High blood pressure68%
- Osteoporosis40%
- Ischemic heart disease30%
- Diabetes28%
Hospitals where Arthur M. Mandelin Ii works
Medicare's Facility Affiliation Data lists Arthur M. Mandelin Ii at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Northwestern Lake Forest HospitalLake Forest, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140130
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140242
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140211
- Northwestern Memorial HospitalChicago, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140281
- Palos Community HospitalPalos Heights, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140062
Practice locations
Addresses where Arthur M. Mandelin Ii is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 20; the Medicare profile lists all.
- 1135 S Delano Ct EChicago, IL 60605 (630) 933‑1500
- 1135 W Delano Ct, A201Chicago, IL 60605 (312) 695‑0665
- 1333 W Belmont AveChicago, IL 60657
- 1630 Sherman AveEvanston, IL 60201
- 233 S Gary AveBloomingdale, IL 60108 (630) 358‑4414
Group practices
Medicare enrollment lists Arthur M. Mandelin Ii as a member of this group (CMS data updated October 2, 2026).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
Specialties
- Rheumatologyprimary
- Internal Medicinealso
Other rheumatologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Other clinicians in Northwestern Medical Faculty Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2002 (24 years since medical school) |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1669655569 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians