HERNAN SIERRA FERNANDEZ M.D.
NPI 1104074749
Pediatrics - Neonatal-Perinatal Medicine in Chicago, IL

Q: What is Hernan Sierra Fernandez's NPI number?

The NPI number for Hernan Sierra Fernandez is 1104074749. It was assigned to this individual provider in the NPPES registry on September 8, 2008.

Q: What is Hernan Sierra Fernandez's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Active since September 08, 2008PECOS Enrolled

840 S WOOD ST, CSB 1262, M/C 856, CHICAGO, IL 60612(312) 355-3282(312) 355-5548 Get Directions Write a Review

NPPES record last updated: May 1, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Hernan Sierra Fernandez M.d. NPPES

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

HERNAN SIERRA FERNANDEZ M.D. (NPI 1104074749) is an individual neonatal-perinatal medicine provider in Chicago, Illinois, licensed in Illinois (036-120314) and active in the NPI registry since September 2008. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1104074749

Entity TypeIndividualMale

Primary Taxonomy2080N0001X

Provider Legal NameHERNAN SIERRA FERNANDEZCredential: M.D.

Location Address840 S WOOD ST, CSB 1262, M/C 856Chicago, IL 60612-4325

Mailing Address130 N Garland Ct Apt 1703Chicago, IL 60602-4768 · (312) 810-4065

Phone(312) 355-3282

Fax(312) 355-5548

Sole ProprietorYes

Enumeration DateSeptember 8, 2008

Last NPPES UpdateMay 1, 2020

NPPES CertifiedMay 1, 2020

✔ NPI 1104074749 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Neonatal-Perinatal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code2080N0001X

Licenses✔ Licensed in IL · 036-120314✔ Licensed in CA · A105435

Definition

A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies.

840 S WOOD ST, Chicago, IL 60612

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Secondary Practice Locations 2

Location 12525 Chicago AveMinneapolis, MN 55404-4518 · Phone (312) 810-4065

Location 2345 Smith Ave NSaint Paul, MN 55102-2346 · Phone (312) 810-4065

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Hernan Sierra Fernandez 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.

Medicare Billing Reassignments

Medicare enrollment records show Hernan Sierra Fernandez reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Board Of Trustees Of The University Of Illinois

0.1 mi

Dermatology

808 S WOOD ST
Chicago, IL 60612

Reassigned Medicare billing, Illinois enrollment
2,127 clinicians in this Medicare group

NPI 1265651434 (312) 996-6966

Rush University Medical Center

1.6 mi

Diagnostic Radiology

1620 W HARRISON ST
Chicago, IL 60612

Reassigned Medicare billing, Illinois enrollment
Medicare enrollment name: Rush University Medical Group
2,169 clinicians in this Medicare group

NPI 1184269425 (312) 563-4270

Bonaventure Medical Foundation, LLC

19 mi

Family Medicine

701 BIESTERFIELD RD UNIT 4D
Elk Grove Village, IL 60007

Reassigned Medicare billing, Illinois enrollment
281 clinicians in this Medicare group

NPI 1588775647 (855) 692-6482

Rockford Health Physicians

72 mi

Multi-Specialty

8201 E RIVERSIDE BLVD
Rockford, IL 61114

Reassigned Medicare billing, Illinois enrollment
1,375 clinicians in this Medicare group

NPI 1043242886 (608) 314-2428

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

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. KYLE CORSO MORK PHARMD, MBA

Pharmacist (Ambulatory Care)

840 S WOOD ST
CHICAGO, IL 60612

Cook County (312) 996-6783

DR. ALEXANDER SALIM GEHA MD

Surgery

840 S WOOD ST, SUITE 417 CSB
CHICAGO, IL 60612

Cook County (312) 996-5402

DR. KAREN STEINMETZ PATER PHARMD, BCPS, CDE

Pharmacist (Pharmacotherapy)

840 S WOOD ST, SUITE 163, CSB
CHICAGO, IL 60612

Cook County (312) 996-0870

MISS SHIYUN KIM PHARMD

Pharmacist (Pharmacotherapy)

840 S WOOD ST, SUITE 163 CLINICAL SCIENCES BUILDING
CHICAGO, IL 60612

Cook County (312) 996-5025

OANA CRISTINA DANCIU M.D.

Internal Medicine (Hematology & Oncology)

840 S WOOD ST, MC-713
CHICAGO, IL 60612

Cook County (312) 996-1581

DR. MARY BIGLIN MD

Internal Medicine (Gastroenterology)

840 S WOOD ST
CHICAGO, IL 60612

Cook County (312) 996-6651

ALICIA CHANG COJULUN MD

Student in an Organized Health Care Education/Training Program

840 S WOOD ST, MC 856
CHICAGO, IL 60612

Cook County (708) 691-0426

ABDUL KHAYYAM MOHAMMED MD

Pathology (Anatomic Pathology)

840 S WOOD ST
CHICAGO, IL 60612

Cook County (331) 300-9864

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 Hernan Sierra Fernandez's NPI number?

The NPI number for Hernan Sierra Fernandez is 1104074749. It was assigned to this individual provider in the NPPES registry on September 8, 2008.

Where is Hernan Sierra Fernandez located?

Hernan Sierra Fernandez practices at 840 S Wood St Csb 1262, M/C 856, Chicago, IL 60612. The listed phone number is (312) 355-3282.

What is Hernan Sierra Fernandez's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Is Hernan Sierra Fernandez enrolled in Medicare?

Yes. Hernan Sierra Fernandez is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Hernan Sierra Fernandez's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hernan Sierra Fernandez reassigns Medicare benefits to 4 organizations: The Board Of Trustees Of The University Of Illinois (Chicago, IL), Rush University Medical Center (Chicago, IL), Bonaventure Medical Foundation, LLC (Elk Grove Village, IL) and Rockford Health Physicians (Rockford, 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 Hernan Sierra Fernandez's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Hernan Sierra Fernandez was last updated on May 1, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.