DR. MICHAEL ACHILLES MARKOS M.D.
NPI 1861658007
Internal Medicine - Critical Care Medicine in Berwyn, IL

Q: What is Michael Markos's NPI number?

The NPI number for Michael Markos is 1861658007. It was assigned to this individual provider in the NPPES registry on August 6, 2008.

Q: What is Michael Markos's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

Q: When was this NPI record last updated?

The NPPES record for Michael Markos was last updated on February 9, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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 August 06, 2008PECOS EnrolledAccepts Medicare Assignment

3249 OAK PARK AVE, BERWYN, IL 60402(708) 783-2232(708) 783-2078 Get Directions Write a Review

NPPES record last updated: February 9, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Feb 9, 2024, May 24, 2022 (2 updates tracked since 2022).

On this page

About Dr. Michael Achilles Markos M.d. NPPES

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

DR. MICHAEL ACHILLES MARKOS M.D. (NPI 1861658007) is an individual critical care medicine provider in Berwyn, Illinois, licensed in Illinois (036123662) and active in the NPI registry since August 2008. He is enrolled in Medicare PECOS, is affiliated with Macneal Hospital, and is a graduate of Other (2006).

NPPES Registry Identity

NPI1861658007

Entity TypeIndividualMale

Primary Taxonomy207RC0200X

Provider Legal NameDR. MICHAEL ACHILLES MARKOSCredential: M.D.

Location Address3249 OAK PARK AVEBerwyn, IL 60402-3429

Mailing Address3249 Oak Park Ave OfcBerwyn, IL 60402-0715 · (708) 783-2232 · Fax (708) 783-2078

Phone(708) 783-2232

Fax(708) 783-2078

Sole ProprietorNo

Medical School CMSOtherGraduated 2006

Enumeration DateAugust 6, 2008

Last NPPES UpdateFebruary 9, 20242 updates tracked since enumeration

NPPES CertifiedFebruary 9, 2024

✔ NPI 1861658007 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Critical Care MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RC0200X

License✔ Licensed in IL · 036123662

Definition

An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.

Also ListedInternal MedicineTaxonomy 207R00000X · License 036123662 (IL)

Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X · License 036123662 (IL)

3249 OAK PARK AVE, Berwyn, IL 60402

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.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. Michael Achilles Markos M.d. 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 ID9739232661

PECOS Enrollment IDI20090724000496

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 Michael Markos reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Loyola University Medical Center

2.9 mi

General Practice

2160 S 1ST AVE
Maywood, IL 60153

Reassigned Medicare billing, Illinois enrollment
1,138 clinicians in this Medicare group

NPI 1336159961 (708) 216-3215

Advocate Health And Hospitals Corporation

5.1 mi

General Acute Care Hospital

3435 W VAN BUREN ST
Chicago, IL 60624

Reassigned Medicare billing, Illinois enrollment
4,870 clinicians in this Medicare group

NPI 1801838339 (773) 265-7700

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 4

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.

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

271 services111 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.

115 services86 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

13 services13 patients

Insertion of non-tunneled central venous tube for infusion (5 years or older) 36556

This procedure involves placing a thin tube into a large vein, usually in the neck or chest, to administer medication or fluids. It's done under local anesthesia to minimize discomfort. It's a standard, safe procedure for individuals aged 5 and above.

11 services11 patients

Hospital Affiliations CMS Care Compare 2

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

Macneal Hospital

Acute Care Hospitals · Berwyn, IL

2/5 CMS rating

OwnershipProprietary

CMS Certification Number140054

Location3249 South Oak Park AvenueBerwyn, IL 60402 · Cook County

Emergency services Birthing friendly

Loyola University Medical Center

Acute Care Hospitals · Maywood, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140276

Location2160 S 1st AvenueMaywood, IL 60153 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60402 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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

1 supplier12 claims12 services$15.77 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

1 supplier12 claims12 services$67.60 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

MRS. DANIELLE GENGO R.D.

Dietitian, Registered

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-3077

GOTTLIEB COMMUNITY HEALTH SERVICES CORPORATION

General Practice

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-3125

MARIA RAMIREZ

Family Medicine

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-9100

PATRICIA NAUGHTON MD

Obstetrics & Gynecology

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-3792

PAUL G FAINE M.D.

Emergency Medicine

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-9100

DR. BHARTI RAIZADA M.D,

Anesthesiology

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-6339

SHEENA REDDY KODAVALURU M.D.

Internal Medicine

3249 OAK PARK AVE, MACNEAL HOSPITAL
BERWYN, IL 60402

Cook County (708) 783-9100

DR. ANGELA DIANIRA ALCARRAZ BEDRILLANA MD

Student in an Organized Health Care Education/Training Program

3249 OAK PARK AVE
BERWYN, IL 60402

Cook County (708) 783-6566

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 Michael Markos's NPI number?

The NPI number for Michael Markos is 1861658007. It was assigned to this individual provider in the NPPES registry on August 6, 2008.

Where is Michael Markos located?

Michael Markos practices at 3249 Oak Park Ave, Berwyn, IL 60402. The listed phone number is (708) 783-2232.

What is Michael Markos's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

Is Michael Markos enrolled in Medicare?

Yes. Michael Markos 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 Michael Markos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Markos reassigns Medicare benefits to 2 organizations: Loyola University Medical Center (Maywood, IL) and Advocate Health And Hospitals Corporation (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 Michael Markos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Michael Markos accept?

Health plans from Oscar Health list Michael Markos 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 Michael Markos affiliated with any hospitals?

According to CMS data, Michael Markos is affiliated with Macneal Hospital and Loyola University Medical Center.

When was this NPI record last updated?

The NPPES record for Michael Markos was last updated on February 9, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.