DR. APARNA NATARAJAN MD
NPI 1417264144
Internal Medicine - Nephrology in Chicago, IL

Q: What is Aparna Natarajan's NPI number?

The NPI number for Aparna Natarajan is 1417264144. It was assigned to this individual provider in the NPPES registry on September 1, 2010.

Q: What is Aparna Natarajan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Q: When was this NPI record last updated?

The NPPES record for Aparna Natarajan was last updated on May 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since September 01, 2010PECOS EnrolledAccepts Medicare Assignment

1725 W HARRISON ST STE 762, CHICAGO, IL 60612(312) 563-1230 Get Directions Write a Review

NPPES record last updated: May 5, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 5, 2026, Jun 28, 2021, Apr 23, 2018 (3 updates tracked since 2018).

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About Dr. Aparna Natarajan Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. APARNA NATARAJAN MD (NPI 1417264144) is an individual nephrology provider in Chicago, Illinois, licensed in Illinois (036132096) and active in the NPI registry since September 2010. She is enrolled in Medicare PECOS, is affiliated with Saint Anthony Hospital, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1417264144

Entity TypeIndividualFemale

Primary Taxonomy207RN0300X

Provider Legal NameDR. APARNA NATARAJANCredential: MD

Location Address1725 W HARRISON ST STE 762Chicago, IL 60612-3852

Mailing Address1725 W Harrison St Ste 762Chicago, IL 60612-3852 · (312) 563-1230

Phone(312) 563-1230

Sole ProprietorNo

Medical School CMSOtherGraduated 2006

Enumeration DateSeptember 1, 2010

Last NPPES UpdateMay 5, 20263 updates tracked since enumeration

NPPES CertifiedMay 5, 2026

✔ NPI 1417264144 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians

Taxonomy Code207RN0300X

License✔ Licensed in IL · 036132096

Definition

An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.

1725 W HARRISON ST STE 762, Chicago, IL 60612

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Secondary Practice Location 1

Location 12222 W Division St Ste 210Chicago, IL 60622-3094 · Phone (773) 484-4330

Other Identifiers 1

Medicaid036132096IL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Aparna Natarajan Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3072747799

PECOS Enrollment IDI20131014000441

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Aparna Natarajan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Rush University Medical Group

0.2 mi

Internal Medicine

1620 W HARRISON ST
Chicago, IL 60612

Reassigned Medicare billing, Illinois enrollment
2,169 clinicians in this Medicare group

NPI 1093819542 (312) 942-5000

Rush Medical Group

0.2 mi

Internal Medicine

1620 W HARRISON ST
Chicago, IL 60612

Reassigned Medicare billing, Illinois enrollment
548 clinicians in this Medicare group

NPI 1467312850 (312) 942-5000

Northwest Medical Associates Of Chicago LLC

1.9 mi

Specialist

2875 W 19TH ST
Chicago, IL 60623

Reassigned Medicare billing, Illinois enrollment
4 clinicians in this Medicare group

NPI 1932218708 (773) 262-4588

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

309 services86 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

93 services46 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

75 services66 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

32 services17 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

19 services12 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Saint Anthony Hospital

Acute Care Hospitals · Chicago, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140095

Location2875 West 19th StreetChicago, IL 60623 · Cook County

Emergency services Birthing friendly

Rush University Medical Center

Acute Care Hospitals · Chicago, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140119

Location1653 West Congress ParkwayChicago, IL 60612 · Cook County

Emergency services Birthing friendly

Presence Saints Mary And Elizabeth Medical Center

Acute Care Hospitals · Chicago, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number140180

Location2233 W Division StChicago, IL 60622 · Cook County

Emergency services Birthing friendly

Humboldt Park Health

Acute Care Hospitals · Chicago, IL

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140206

Location1044 N Francisco AveChicago, IL 60622 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KATELYN SPINNEY NP

Nurse Practitioner (Family)

1725 W HARRISON ST STE 762
CHICAGO, IL 60612

Cook County (312) 942-8120

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Aparna Natarajan's NPI number?

The NPI number for Aparna Natarajan is 1417264144. It was assigned to this individual provider in the NPPES registry on September 1, 2010.

Where is Aparna Natarajan located?

Aparna Natarajan practices at 1725 W Harrison St Ste 762, Chicago, IL 60612. The listed phone number is (312) 563-1230.

What is Aparna Natarajan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Aparna Natarajan enrolled in Medicare?

Yes. Aparna Natarajan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Aparna Natarajan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aparna Natarajan reassigns Medicare benefits to 3 organizations: Rush University Medical Group (Chicago, IL), Rush Medical Group (Chicago, IL) and Northwest Medical Associates Of Chicago LLC (Chicago, IL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Aparna Natarajan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Aparna Natarajan accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Aparna Natarajan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Aparna Natarajan affiliated with any hospitals?

According to CMS data, Aparna Natarajan is affiliated with Saint Anthony Hospital, Rush University Medical Center, Presence Saints Mary And Elizabeth Medical Center and Humboldt Park Health.

When was this NPI record last updated?

The NPPES record for Aparna Natarajan was last updated on May 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.