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DR. NATALIE S OPANASETS M.D.
NPI 1366615833
Family Medicine in Michigan City, IN

Active since April 07, 2008PECOS EnrolledAccepts Medicare Assignment
87.95/100
CMS Quality Rating
4111 FRANKLIN ST, MICHIGAN CITY, IN 46360(219) 873-2919(219) 873-2909 Get Directions Write a Review

NPPES record last updated: March 14, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 14, 2025, Mar 8, 2024, Jun 9, 2021 and 2 more (5 updates tracked since 2018).

About Dr. Natalie S Opanasets M.d. NPPES

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

DR. NATALIE S OPANASETS M.D. (NPI 1366615833) is an individual family medicine provider in Michigan City, Indiana, licensed in Illinois (036123887) and active in the NPI registry since April 2008. She is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and maintains 7 additional practice locations.

NPPES Registry Identity

NPI1366615833
Entity TypeIndividualFemale
Primary Taxonomy207Q00000X
Provider Legal NameDR. NATALIE S OPANASETSCredential: M.D.
Location Address4111 FRANKLIN STMichigan City, IN 46360-7803
Mailing Address150 Harvester Dr Ste 300Burr Ridge, IL 60527-5965
Phone(219) 873-2919
Fax(219) 873-2909
Sole ProprietorNo
Medical School CMSOtherGraduated 1998
Enumeration DateApril 7, 2008
Last NPPES UpdateMarch 14, 20255 updates tracked since enumeration
NPPES CertifiedMarch 14, 2025
✔ NPI 1366615833 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
Licenses✔ Licensed in IL · 036123887✔ Licensed in IN · 01069068A
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
4111 FRANKLIN ST, Michigan City, IN 46360
Open in Google Maps ↗

Secondary Practice Locations 7

Location 13630 Willowcreek RdPortage, IN 46368-5075 · Phone (219) 364-3900 · Fax (219) 364-3595
Location 23777 N Frontage Rd Ste 500Michigan City, IN 46360-7697 · Phone (219) 809-2889
Location 3401 NewPorte BlvdLa Porte, IN 46350-4099 · Phone (219) 575-6244
Location 4809 LaPorte Ave Ste BValparaiso, IN 46383-5801 · Phone (219) 263-4977 · Fax (219) 263-4979
Location 5650 Dickinson RdChesterton, IN 46304-3387 · Phone (219) 926-7755 · Fax (219) 929-1885
Location 65841 S Maryland AveChicago, IL 60637-1443 · Phone (888) 824-0200
Location 747 W Polk St Ste G1Chicago, IL 60605-2083 · Phone (888) 824-0200

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.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. Natalie S Opanasets 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 ID8426237892
PECOS Enrollment IDI20110201000523, I20110415000168
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

5

Medicare enrollment records show Natalie Opanasets reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

La Porte Clinic Company LLC
17 mi
Internal Medicine
85 E US HIGHWAY 6
Valparaiso, IN 46383
  • Reassigned Medicare billing, Indiana enrollment
  • 153 clinicians in this Medicare group
NPI 1568829224 (219) 983-6300
Porter Physician Services LLC
17 mi
Family Medicine
85 E US HIGHWAY 6
Valparaiso, IN 46383
  • Reassigned Medicare billing, Indiana enrollment
  • 177 clinicians in this Medicare group
NPI 1508075680 (219) 983-6380
Franciscan Physician Network
36 mi
Urgent Care
1515 W DRAGOON TRL
Mishawaka, IN 46544
  • Reassigned Medicare billing, Indiana enrollment
  • 1,396 clinicians in this Medicare group
NPI 1366879009 (574) 254-6253
The University Of Chicago Medical Center
38 mi
General Acute Care Hospital
5841 S MARYLAND AVE
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 1,905 clinicians in this Medicare group
NPI 1033218128 (773) 702-1530
University Of Chicago
38 mi
Multi-Specialty
5841 S MARYLAND AVE, UCPG/MC 1099
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois and Indiana enrollments
  • Also billed through NPI 1477262046 (Illinois)
  • 2,237 clinicians in this Medicare group
NPI 1821048786 (773) 702-9200

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 10

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
187 services176 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
47 services47 patients
Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen 87635
This is a lab test that detects the presence of COVID-19 in your body. It uses a technique to amplify the virus's genetic material, either DNA or RNA, making it easier to identify. A positive result indicates an active infection.
46 services46 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
41 services41 patients
X-ray of chest, 2 views 71046
A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.
38 services38 patients
Urinalysis, manual test 81002
A urinalysis is a simple, non-invasive test that checks the urine for various elements such as sugar, protein, and signs of infection. It can help detect many common conditions, including kidney disease and diabetes. The manual test involves a lab technician examining a urine sample.
32 services32 patients

Hospital Affiliations CMS Care Compare 2

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

The University Of Chicago Medical Center

Acute Care Hospitals · Chicago, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140088
Location5841 South MarylandChicago, IL 60637 · Cook County
Emergency services Birthing friendly

Franciscan Health Munster

Acute Care Hospitals · Munster, IN
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number150165
Location701 Superior AveMunster, IN 46321 · Lake County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 46360 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
$82.04 typical visit price
range $53.07 – $161.76
Typical copayment $20.51 (range $13.26 – $40.44)
Most-billed visit code 99203
Established Patient
$94.22 typical visit price
range $16.93 – $132.22
Typical copayment $23.55 (range $4.23 – $33.05)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

87.95/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality74.04
Promoting Interoperability100
Improvement Activities40

Other Providers at the Same Location NPPES 11

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

NICHOLE M SHULTZ FNP
Nurse Practitioner (Family)
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (121) 987-3291
DR. MICHAEL OWOLABI M.D.
Emergency Medicine
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 873-2919
DR. STEVEN DALE WHALEY M.D.
Preventive Medicine (Preventive Medicine/Occupational Environmental Medicine)
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 476-9389
VICTORIA TIEMENS NP
Nurse Practitioner (Family)
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 873-2919
DR. JAROSLAW KUNA M.D.
Family Medicine
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 873-2919
DR. ROBERT P MARINO D.O.
Family Medicine
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 873-2919
MAYUMI L. CAYDE LESLIE M.D.
Family Medicine
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 873-2919
MRS. BILLIE-ANN BLACK DNP
Nurse Practitioner (Family)
4111 FRANKLIN ST
MICHIGAN CITY, IN 46360
Laporte County (219) 873-2919

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 Natalie Opanasets's NPI number?

The NPI number for Natalie Opanasets is 1366615833. It was assigned to this individual provider in the NPPES registry on April 7, 2008.

Where is Natalie Opanasets located?

Natalie Opanasets practices at 4111 Franklin St, Michigan City, IN 46360. The listed phone number is (219) 873-2919.

What is Natalie Opanasets's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Natalie Opanasets enrolled in Medicare?

Yes. Natalie Opanasets 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 Natalie Opanasets's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Natalie Opanasets reassigns Medicare benefits to 5 organizations: La Porte Clinic Company LLC (Valparaiso, IN), Porter Physician Services LLC (Valparaiso, IN), Franciscan Physician Network (Mishawaka, IN), The University Of Chicago Medical Center (Chicago, IL) and University Of Chicago (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 Natalie Opanasets's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Natalie Opanasets accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian and Anthem Blue Cross and Blue Shield list Natalie Opanasets 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 Natalie Opanasets affiliated with any hospitals?

According to CMS data, Natalie Opanasets is affiliated with The University Of Chicago Medical Center and Franciscan Health Munster.

When was this NPI record last updated?

The NPPES record for Natalie Opanasets was last updated on March 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months 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.