Active NPI 1689208928 Individual Practitioner Female Practitioner

Mary Christine Johansen , APRN, CNP

Nurse Practitioner • Mchenry, IL

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Mary Johansen, APRN, CNP is a certified Nurse Practitioner practicing in Mchenry, IL. With approximately 7 years of clinical experience since completing medical education in 2019, Mary Johansen delivers high-quality medical care to the local community at 4309 W MEDICAL CENTER DR STE A200.

Mary Johansen maintains professional affiliations with Best Practices Inpatient Care, Ltd., Northwestern Medical Faculty Foundation and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, hospital discharge day management, more than, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

4309 W Medical Center Dr Ste A200

Mchenry, IL 600508437

Telephone 8157598070

Fax 8157594931

Associated Practice Facility / Clinic

🏢 Centegra Health System Facility NPI 1497136071

Medicare Profile & Education

Medical School

Other

Graduation Year

2019

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Nurse Practitioner in Mchenry, IL

Experienced Practitioner (5-10 Yrs)

Practitioner Clinical Experience

7 Yrs -2.2 yrs vs City Avg

City Avg: 9.2 Yrs

State Avg: 10.4 Yrs

Regional Practice Density

42 Specialists

Practicing in Mchenry, IL (4929 Statewide)

Telehealth Adoption Rate

28.6% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

60.2% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Johansen (7 Years) 7 Yrs

Mchenry Specialty Average (9.2 Years) 9.2 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	47	27	$220.00	$101.51
99239 Hospital discharge day management, more than 30 minutes	18	18	$227.00	$98.33
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	12	12	$429.00	$149.00

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	39	16	$220.00	$104.41

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	352	291	$200.00	$105.67
99443 Telephone medical discussion with physician, 21-30 minutes	149	114	$200.00	$105.23
94660 Initiation and management of continued pressured respiratory assistance by mask or breathing tube	146	136	$116.00	$52.22
94375 Diagnostic testing in a pulmonary function lab	125	106	$73.00	$30.99
94726 Determination of lung volumes using plethysmography	67	64	$150.00	$43.69
94729 Test to examine how well the lungs exchange gases	57	54	$99.00	$46.62
94618 Test for exercise-induced lung stress	25	25	$123.00	$27.55
99442 Telephone medical discussion with physician, 11-20 minutes	21	20	$45.00	$44.61
71045 X-ray of chest, 1 view	21	19	$60.00	$21.05
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	17	16	$270.00	$149.98
G0008 Administration of influenza virus vaccine	12	12	$95.00	$28.04

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	305	224	$200.00	$107.76
94375 Diagnostic testing in a pulmonary function lab	188	118	$73.00	$31.54
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	115	82	$270.00	$150.99
99443 Telephone medical discussion with physician, 21-30 minutes	103	74	$199.95	$107.77
94726 Determination of lung volumes using plethysmography	95	90	$150.00	$43.93
94729 Test to examine how well the lungs exchange gases	89	83	$99.00	$47.45
94660 Initiation and management of continued pressured respiratory assistance by mask or breathing tube	83	80	$116.00	$51.88
J2920 Injection, methylprednisolone sodium succinate, up to 40 mg	34	16	$20.00	$4.35
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	28	15	$44.00	$11.61
94618 Test for exercise-induced lung stress	25	25	$123.00	$27.73
36415 Insertion of needle into vein for collection of blood sample	18	17	$27.00	$3.00
71045 X-ray of chest, 1 view	18	16	$60.00	$20.92
99495 Transitional care management services for problem of at least moderate complexity	15	14	$225.00	$169.83
99213 Established patient office or other outpatient visit, typically 15 minutes	14	14	$135.00	$75.87
94060 Test to measure expiratory airflow and volume changes before and after medication administration	12	12	$116.00	$37.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	19	16	$200.00	$90.79

Medical Specialties & State Licenses

CMS Verified: 2026-02-17

Nurse Practitioner Primary Specialty

NUCC Taxonomy Code: 363L00000X

State License IL 209020914

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

Nurse Practitioner - Adult Health

NUCC Taxonomy Code: 363LA2200X

State License IL 209020614

Definition to come...

Nurse Practitioner - Family

NUCC Taxonomy Code: 363LF0000X

State License IL 209.020914

Definition to come...

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

209020914 (IL)

Hospital & Practice Group Affiliations

Best Practices Inpatient Care, Ltd.

450 W Hwy 22, Barrington, IL 600101919

Phone: 8473819600

Northwestern Medical Faculty Foundation

4309 W Medical Ctr Dr, Mchenry, IL 600508411

Phone: 8157598070

Northwestern Medical Faculty Foundation

4201 W Medical Ctr Dr, Mchenry, IL 600508409

Phone: 8157594800

Northwestern Medical Faculty Foundation

4201 W Medical Ctr Dr, Mchenry, IL 600508409

Phone: 8157594323

Northwestern Medical Faculty Foundation

515 Valley View Dr, Moline, IL 612656175

Phone: 3126950870

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

29 Associated Practitioners

Dr. Asim Zaidi , MD

Internal Medicine - Interventional Cardiology

NPI 1063641181

Doctor of Medicine (M.D.)

Dr. Mohammad Kizilbash , MD

Internal Medicine - Cardiovascular Disease

NPI 1114162948

Doctor of Medicine (M.D.)

Justin Duffy , PA-C

Physician Assistant

NPI 1174918809

Physician Assistant (Certified)

Judi Forner

Clinical Nurse Specialist - Adult Health

NPI 1194123679

Mayra Perez Martinez , APRN, CNP

Nurse Practitioner

NPI 1205609351

Advanced Practice Registered Nurse, Certified Nurse Practitioner

Michelle Shimek , ACNP, CNP

Nurse Practitioner

NPI 1205665478

ACNP, Certified Nurse Practitioner

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

14 Historical Events

📍

Updated Practice Location February 17, 2026

Registered at 4309 W MEDICAL CENTER DR STE A200, MCHENRY, IL 600508437 (Tel: 8157598070)

📍

Updated Business Mailing Address February 17, 2026

Registered at 4309 W MEDICAL CENTER DR STE A200, MCHENRY, IL 600508437 (Tel: 8157598070)

👤

Provider Name / Credentials Updated February 17, 2026

Recorded as MARY JOHANSEN, APRN, CNP

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 17, 2026

Nurse Practitioner (License #209020914 in IL)

📍

Updated Practice Location November 09, 2022

Registered at 3880 SALEM LAKE DR STE F, LONG GROVE, IL 600475292 (Tel: 8477192220)

📍

Updated Business Mailing Address November 09, 2022

Registered at 3880 SALEM LAKE DR STE F, LONG GROVE, IL 600475292 (Tel: 8477192220)

📍

Updated Practice Location January 04, 2022

Registered at 1340 RYAN PKWY, ALGONQUIN, IL 601024527 (Tel: 8154775350)

📍

Updated Business Mailing Address January 04, 2022

Registered at 1340 RYAN PKWY, DEERFIELD, IL 600153609 (Tel: 8154777350)

✅

NPI Profile Active February 25, 2020

NPI status registered as active in NPPES database

📍

Updated Practice Location February 25, 2020

Registered at 964 INVERRARY LN, DEERFIELD, IL 600153609 (Tel: 8477072081)

📍

Updated Business Mailing Address February 25, 2020

Registered at 964 INVERRARY LN, DEERFIELD, IL 600153609 (Tel: 8477072081)

👤

Provider Name / Credentials Updated February 25, 2020

Recorded as MARY JOHANSEN, APRN

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 25, 2020

Nurse Practitioner (License #209.020914 in IL)

🟢

Initial NPI Registration & Enumeration February 25, 2020

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1689208928

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: February 25, 2020

Last Update: February 17, 2026

Sole Proprietor: Yes

Update or Correct Profile

Mailing Address

4309 W Medical Center Dr Ste A200

Mchenry, IL 600508437

Phone: 8157598070

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.