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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.

CARMEN GNATENCO M.D., S.C.
NPI 1871750711
Internal Medicine in Palos Heights, IL

Active since May 19, 2008
12211 S HARLEM AVE STE 2S, PALOS HEIGHTS, IL 60463(708) 295-9399(866) 920-1134 Get Directions Write a Review

NPPES record last updated: September 22, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 22, 2026, Aug 24, 2020 (2 updates tracked since 2020).

About Carmen Gnatenco M.d., S.c. NPPES

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

CARMEN GNATENCO M.D., S.C. (NPI 1871750711) is a healthcare organization registered as an internal medicine in Palos Heights, Illinois and active in the NPI registry since May 2008. The organization lists Julian I Gnatenco, Billing Manager, as its authorized official.

NPPES Registry Identity

NPI1871750711
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameCARMEN GNATENCO M.D., S.C.
Location Address12211 S HARLEM AVE STE 2SPalos Heights, IL 60463-1471
Mailing Address6400 W College Dr Ste 600Palos Heights, IL 60463-1900 · (708) 389-3224 · Fax (708) 389-3587
Phone(708) 295-9399
Fax(866) 920-1134
Organization SubpartNo
Authorized OfficialJulian I GnatencoBilling Manager · (773) 742-8926
Enumeration DateMay 19, 2008
Last NPPES UpdateSeptember 22, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 22, 2026
✔ NPI 1871750711 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
12211 S HARLEM AVE STE 2S, Palos Heights, IL 60463
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Other Identifiers 3

Medicaid036115290IL
Other1639587IL · Bcbs
OtherP00692896IL · Railroad Medicare

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Carmen Gnatenco M.d., S.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Carmen Gnatenco M.D., S.C., which bills Medicare for the services this clinician delivers.

Clinician (1)

Carmen Gnatenco, M.D.
Internal Medicine
NPI 1043363708
12211 S HARLEM AVE
Palos Heights, IL 60463
(708) 295-9399
✔ PECOS✔ Accepts MedicareSame address

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

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 Carmen Gnatenco M.D., S.C.'s NPI number?

The NPI number for Carmen Gnatenco M.D., S.C. is 1871750711. It was assigned to this organization in the NPPES registry on May 19, 2008.

Where is Carmen Gnatenco M.D., S.C. located?

Carmen Gnatenco M.D., S.C. is located at 12211 S Harlem Ave Ste 2S, Palos Heights, IL 60463. The listed phone number is (708) 295-9399.

What is Carmen Gnatenco M.D., S.C.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Carmen Gnatenco M.D., S.C. enrolled in Medicare?

Yes. Carmen Gnatenco M.D., S.C. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Carmen Gnatenco M.D., S.C.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Carmen Gnatenco M.D., S.C.. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Carmen Gnatenco M.D., S.C. was last updated on September 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 34 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.