1. Home
  2. Directory
  3. Illinois
  4. Chicago
  5. Internal Medicine
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ROBERT ALLAN ALTER M.D.
NPI 1821064585
Internal Medicine - Geriatric Medicine in Chicago, IL

Active since February 23, 2006PECOS Enrolled
2545 S KING DR, CHICAGO, IL 60616(312) 842-7117(312) 326-2102 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About Robert Allan Alter M.d. NPPES

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

ROBERT ALLAN ALTER M.D. (NPI 1821064585) is an individual geriatric medicine provider in Chicago, Illinois and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1821064585
Entity TypeIndividualMale
Primary Taxonomy207RG0300X
Provider Legal NameROBERT ALLAN ALTERCredential: M.D.
Location Address2545 S KING DRChicago, IL 60616-2441
Mailing Address2311 W 22nd St, Suite 202Oak Brook, IL 60523-1225 · (630) 320-1160 · Fax (630) 320-1231
Phone(312) 842-7117
Fax(312) 326-2102
Sole ProprietorNo
Enumeration DateFebruary 23, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1821064585 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Geriatric MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RG0300X
Definition
An internist who has special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes and the hospital.
Also ListedInternal MedicineTaxonomy 207R00000X
2545 S KING DR, Chicago, IL 60616
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Robert Allan Alter M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60616 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
$183.39 typical visit price
range $60.08 – $183.39
Typical copayment $45.84 (range $15.02 – $45.84)
Most-billed visit code 99205
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 20

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

DR. ADESHOLA EZEOKOLI MD
Internal Medicine
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117
JOHN SOBOLSKI M.D.
Internal Medicine (Cardiovascular Disease)
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117
LAWRENCE NGU M.D.
Internal Medicine
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117
DAVID STERN M.D.
Surgery
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117
MRS. KATHLEEN LACCI BIENIA PA-C, MMSC
Physician Assistant
2545 S KING DR, SYKES ADVOCATE MEDICAL GROUP
CHICAGO, IL 60616
Cook County (312) 842-7117
SANJAY VASUDEO JOAG M.D.
Hospitalist
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117
COLLETTE ARA HONORE M.D.
Dermatology
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117
VIMALA SANTHANAM M.D.
Internal Medicine (Cardiovascular Disease)
2545 S KING DR
CHICAGO, IL 60616
Cook County (312) 842-7117

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 Robert Alter's NPI number?

The NPI number for Robert Alter is 1821064585. It was assigned to this individual provider in the NPPES registry on February 23, 2006.

Where is Robert Alter located?

Robert Alter practices at 2545 S King Dr, Chicago, IL 60616. The listed phone number is (312) 842-7117.

What is Robert Alter's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.

Is Robert Alter enrolled in Medicare?

Yes. Robert Alter is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Robert Alter was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 days 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.