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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARK D'ALESIO MD
NPI 1659063543
Hospitalist in Chicago, IL

Active since May 22, 2023PECOS Enrolled
5841 S MARYLAND AVE, CHICAGO, IL 60637(773) 702-1000 Get Directions Write a Review

NPPES record last updated: September 1, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Sep 1, 2026, Jun 21, 2023, May 22, 2023 (3 updates tracked since 2023).

About Mark D'alesio Md NPPES

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

MARK D'ALESIO MD (NPI 1659063543) is an individual hospitalist provider in Chicago, Illinois, licensed in Illinois (036.179648) and active in the NPI registry since May 2023. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659063543
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameMARK D'ALESIOCredential: MD
Location Address5841 S MARYLAND AVEChicago, IL 60637-1443
Mailing Address150 Harvester Dr Ste 300Burr Ridge, IL 60527-5965 · (773) 702-1150
Phone(773) 702-1000
Sole ProprietorNo
Enumeration DateMay 22, 2023
Last NPPES UpdateSeptember 1, 20263 updates tracked since enumeration
NPPES CertifiedSeptember 1, 2026
✔ NPI 1659063543 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in IL · 036.179648
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
5841 S MARYLAND AVE, Chicago, IL 60637
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark D'alesio Md 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 60637 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 20

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

DR. DON MARTINEZ M.D.
Radiology (Diagnostic Radiology)
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (773) 926-8318
ALEXANDRA DUMITRESCU
Internal Medicine
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (888) 824-0200
PELEG HOROWITZ
Neurological Surgery
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (888) 824-0200
SANDEEP GURBUXANI
Pathology (Hematology)
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (888) 824-0200
DR. NIREN GANDRA M.D.
Internal Medicine
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (773) 702-0240
ALLIE DAKROUB MD MS
Internal Medicine
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (773) 702-1000
SCOTT VASHER MD
Internal Medicine (Pulmonary Disease)
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (773) 702-1000
DR. NATHAN CHARLES NOWALK M.D.
Internal Medicine (Pulmonary Disease)
5841 S MARYLAND AVE
CHICAGO, IL 60637
Cook County (888) 824-0200

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 Mark D'alesio's NPI number?

The NPI number for Mark D'alesio is 1659063543. It was assigned to this individual provider in the NPPES registry on May 22, 2023.

Where is Mark D'alesio located?

Mark D'alesio practices at 5841 S Maryland Ave, Chicago, IL 60637. The listed phone number is (773) 702-1000.

What is Mark D'alesio's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Mark D'alesio enrolled in Medicare?

Yes. Mark D'alesio is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mark D'alesio was last updated on September 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.