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MAURICIO VILLARREAL M.D.
NPI 1770978777
Internal Medicine - Critical Care Medicine in Oak Lawn, IL

Active since April 06, 2015PECOS EnrolledAccepts Medicare Assignment
4440W 95TH ST, OAK LAWN, IL 60453(708) 684-5673(708) 684-2500 Get Directions Write a Review

NPPES record last updated: August 1, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Aug 1, 2022, Jul 26, 2022, Jan 15, 2016 (3 updates tracked since 2016).

About Mauricio Villarreal M.d. NPPES

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

MAURICIO VILLARREAL M.D. (NPI 1770978777) is an individual critical care medicine provider in Oak Lawn, Illinois, licensed in Illinois (036-144641) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Advocate Christ Hospital & Medical Center, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1770978777
Entity TypeIndividualMale
Primary Taxonomy207RC0200X
Provider Legal NameMAURICIO VILLARREALCredential: M.D.
Location Address4440W 95TH STOak Lawn, IL 60453-2600
Mailing Address29373 Network PlChicago, IL 60673-1293 · (847) 390-5900 · Fax (847) 390-4757
Phone(708) 684-5673
Fax(708) 684-2500
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateApril 6, 2015
Last NPPES UpdateAugust 1, 20223 updates tracked since enumeration
NPPES CertifiedAugust 1, 2022
✔ NPI 1770978777 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 · 036-144641
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 036144641 (IL)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
4440W 95TH ST, Oak Lawn, IL 60453
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Secondary Practice Location 1

Location 13134 N Clark StChicago, IL 60657-4414 · Phone (773) 766-4949

Accepted Insurance

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

Mauricio Villarreal 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 ID6002116274
PECOS Enrollment IDI20220714003341
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

2

Medicare enrollment records show Mauricio Villarreal reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Advocate Health & Hospitals Corporation
Same address
Medical Specialty
4440 W 95TH ST
Oak Lawn, IL 60453
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Advocate Health And Hospitals Corporation
  • Also billed through NPI 1629441027 (Illinois)
  • 4,870 clinicians in this Medicare group
NPI 1912936014 (847) 390-5900
Endeavor Health Medical Group
24 mi
Allergy & Immunology
1000 CENTRAL ST
Evanston, IL 60201
  • Reassigned Medicare billing, Illinois enrollment
  • 4,841 clinicians in this Medicare group
NPI 1497701882 (847) 570-5235

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.
105 services67 patients
Insertion of artery tube for blood sampling or infusion through skin 36620
This procedure involves placing a small tube into an artery, usually in the wrist or elbow, to collect blood samples or administer medication. It's done under local anesthesia and is a common, safe practice.
24 services23 patients
Emergent insertion of breathing tube into windpipe using an endoscope 31500
This is a procedure where a thin tube is inserted into your windpipe to aid in breathing. It's done in emergency situations, using an endoscope, a tool with a light and camera, to ensure correct placement.
16 services16 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.
12 services12 patients

Hospital Affiliations CMS Care Compare

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

Advocate Christ Hospital & Medical Center

Acute Care Hospitals · Oak Lawn, IL
2/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140208
Location4440 W 95th StreetOak Lawn, IL 60453 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60453 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.

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 Mauricio Villarreal's NPI number?

The NPI number for Mauricio Villarreal is 1770978777. It was assigned to this individual provider in the NPPES registry on April 6, 2015.

Where is Mauricio Villarreal located?

Mauricio Villarreal practices at 4440W 95th St, Oak Lawn, IL 60453. The listed phone number is (708) 684-5673.

What is Mauricio Villarreal's specialty?

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

Is Mauricio Villarreal enrolled in Medicare?

Yes. Mauricio Villarreal 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 Mauricio Villarreal's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mauricio Villarreal reassigns Medicare benefits to 2 organizations: Advocate Health & Hospitals Corporation (Oak Lawn, IL) and Endeavor Health Medical Group (Evanston, 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 Mauricio Villarreal's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mauricio Villarreal accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Mauricio Villarreal 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 Mauricio Villarreal affiliated with any hospitals?

According to CMS data, Mauricio Villarreal is affiliated with Advocate Christ Hospital & Medical Center.

When was this NPI record last updated?

The NPPES record for Mauricio Villarreal was last updated on August 1, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.