NATALIA BAJ-OSIEWICZ MD
NPI 1619405123
Internal Medicine in Flint, MI

Q: What is Natalia Baj-osiewicz's NPI number?

The NPI number for Natalia Baj-osiewicz is 1619405123. It was assigned to this individual provider in the NPPES registry on May 28, 2017.

Q: What is Natalia Baj-osiewicz's specialty?

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

Active since May 28, 2017PECOS EnrolledAccepts Medicare Assignment

420 S SAGINAW ST, FLINT, MI 48502(810) 232-3522 Get Directions Write a Review

NPPES record last updated: June 23, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 10, 2019, May 28, 2017 (2 updates tracked since 2017).

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About Natalia Baj-osiewicz Md NPPES

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

NATALIA BAJ-OSIEWICZ MD (NPI 1619405123) is an individual internal medicine provider in Flint, Michigan, licensed in Michigan (4301507488) and active in the NPI registry since May 2017. She is enrolled in Medicare PECOS, is affiliated with Ascension Genesys Hospital, and is a graduate of Other (2013).

NPPES Registry Identity

NPI1619405123

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameNATALIA BAJ-OSIEWICZCredential: MD

Location Address420 S SAGINAW STFlint, MI 48502-1803

Mailing Address420 S Saginaw StFlint, MI 48502-1803 · (810) 232-3522

Phone(810) 232-3522

Sole ProprietorNo

Medical School CMSOtherGraduated 2013

Enumeration DateMay 28, 2017

Last NPPES UpdateJune 23, 20222 updates tracked since enumeration

NPPES CertifiedJune 23, 2022

✔ NPI 1619405123 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MI · 4301507488

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.

420 S SAGINAW ST, Flint, MI 48502

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Priority 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

Natalia Baj-osiewicz Md 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 ID1658640677

PECOS Enrollment IDI20220627003063

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 Reassignment

Medicare enrollment records show Natalia Baj-osiewicz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Henry Ford Health Genesys Hospital

Same address

Gastroenterology

420 S SAGINAW ST
Flint, MI 48502

Reassigned Medicare billing, Michigan enrollment
103 clinicians in this Medicare group

NPI 1346620846 (810) 232-3522

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 5

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.

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.

162 services49 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

44 services42 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

25 services12 patients

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.

24 services19 patients

Hospital discharge day management, 30 minutes or less 99238

Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.

14 services13 patients

Hospital Affiliations CMS Care Compare

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

Ascension Genesys Hospital

Acute Care Hospitals · Grand Blanc, MI

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number230197

LocationOne Genesys ParkwayGrand Blanc, MI 48439 · Genesee County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 48502 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

$126.15 typical visit price

range $54.34 – $166.68

Typical copayment $31.53 (range $13.58 – $41.67)

Most-billed visit code 99204

Established Patient

$96.44 typical visit price

range $17.09 – $135.40

Typical copayment $24.11 (range $4.27 – $33.85)

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.

Other Providers at the Same Location NPPES 12

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

SHEEL VANIAWALA

Internal Medicine