Quick answers
- Does Aparna Natarajan accept Medicare assignment?
- Yes. Medicare's clinician data says Aparna Natarajan 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 Aparna Natarajan see?
- In 2024, CMS data shows 167 Original Medicare patients and 575 services for Aparna Natarajan. This counts Original Medicare only and measures volume, not quality.
- What is Aparna Natarajan's NPI number?
- 1417264144. 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 Aparna Natarajan, 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 | 167 |
|---|---|
| Services billed to Medicare | 575 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)309 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)93 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)75 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)32 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)19 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).
- High blood pressure75%
- High cholesterol75%
- Diabetes75%
- Chronic kidney disease75%
- Ischemic heart disease60%
- Heart failure60%
Hospitals where Aparna Natarajan works
Medicare's Facility Affiliation Data lists Aparna Natarajan 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.
- Humboldt Park HealthChicago, IL · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 140206
- Presence Saints Mary and Elizabeth Medical CenterChicago, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140180
- Rush University Medical CenterChicago, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140119
- Saint Anthony HospitalChicago, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140095
Practice locations
Addresses where Aparna Natarajan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1725 W Harrison St, Suite 762Chicago, IL 60612 (312) 942‑8120
- 2222 W Division St, Suite 210Chicago, IL 60622 (773) 227‑2004
Group practices
Medicare enrollment lists Aparna Natarajan as a member of these groups (CMS data updated October 2, 2026).
- Rush University Medical Group1,551 clinicians in the group
- Northwest Medical Associates of Chicago LLC3 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Other clinicians in Rush University Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2006 (20 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417264144 |
| 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