Active NPI 1053400291 Individual Practitioner Female Practitioner

Dr. Mary Margaret Johnson , MD

Internal Medicine • Marshall, MI

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Mary Johnson, MD is a certified Internal Medicine practicing in Marshall, MI. With approximately 42 years of clinical experience since graduating from University Of Michigan Medical School in 1984, Dr. Johnson delivers high-quality medical care to the local community at 200 N MADISON ST.

Dr. Johnson is affiliated with Apogee Medical Group Michigan Pc 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, initial hospital care with straightforward or low-level 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

200 N Madison St

Marshall, MI 490681143

Telephone 2697814271

Associated Practice Facility / Clinic

🏢 Ella E. M. Brown Charitable Circle Facility NPI 1861475360

Medicare Profile & Education

Medical School

University Of Michigan Medical School

Graduation Year

1984

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Marshall, MI

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

42 Yrs +19.0 yrs vs City Avg

City Avg: 23.0 Yrs

State Avg: 26.5 Yrs

Regional Practice Density

7 Specialists

Practicing in Marshall, MI (6010 Statewide)

Telehealth Adoption Rate

57.1% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

6.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Johnson (42 Years) 42 Yrs

Marshall Specialty Average (23.0 Years) 23.0 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
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	230	114	$80.51	$77.03
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	153	68	$123.18	$116.06
99238 Hospital discharge day management, 30 minutes or less	138	131	$84.70	$78.97
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	69	67	$133.89	$128.12
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	48	47	$183.91	$169.74

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	209	85	$84.16	$77.21
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	172	67	$123.11	$116.67
99238 Hospital discharge day management, 30 minutes or less	91	88	$85.88	$77.35
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	46	45	$141.68	$125.53
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	42	38	$183.29	$170.02

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	295	112	$108.95	$100.35
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	155	77	$74.86	$69.65
99238 Hospital discharge day management, 30 minutes or less	98	94	$75.40	$69.99
99220 Hospital observation care, typically 70 minutes	44	41	$184.41	$175.40
99219 Hospital observation care, typically 50 minutes	38	38	$137.03	$129.77
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	37	37	$210.54	$194.34
99217 Hospital observation care on day of discharge	31	31	$78.38	$69.77
99225 Subsequent observation care, typically 25 minutes per day	18	13	$73.30	$69.45
99239 Hospital discharge day management, more than 30 minutes	16	16	$115.81	$102.77
99226 Subsequent observation care, typically 35 minutes per day	16	13	$104.56	$99.26
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	11	11	$140.09	$132.23

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	531	184	$109.07	$101.60
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	97	91	$208.47	$197.83
99238 Hospital discharge day management, 30 minutes or less	82	78	$74.72	$70.97
99239 Hospital discharge day management, more than 30 minutes	36	35	$110.29	$104.61
99226 Subsequent observation care, typically 35 minutes per day	31	22	$106.84	$102.17
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	27	17	$74.53	$71.04
99217 Hospital observation care on day of discharge	25	25	$77.74	$71.03
99220 Hospital observation care, typically 70 minutes	23	23	$188.62	$180.04
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	13	13	$141.27	$134.48

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	461	178	$110.81	$103.72
99239 Hospital discharge day management, more than 30 minutes	89	86	$114.03	$106.64
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	88	83	$216.94	$200.68
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	45	30	$82.57	$72.48
99238 Hospital discharge day management, 30 minutes or less	40	40	$76.28	$72.91
99220 Hospital observation care, typically 70 minutes	38	37	$214.62	$185.47
99217 Hospital observation care on day of discharge	37	35	$80.13	$72.53
99226 Subsequent observation care, typically 35 minutes per day	34	26	$112.53	$104.92

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	540	226	$110.89	$101.10
99239 Hospital discharge day management, more than 30 minutes	213	202	$113.67	$103.95
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	113	110	$215.81	$196.46
99220 Hospital observation care, typically 70 minutes	92	87	$196.38	$181.70
99217 Hospital observation care on day of discharge	88	84	$76.26	$71.14
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	74	54	$78.26	$71.15
99226 Subsequent observation care, typically 35 minutes per day	40	31	$109.26	$102.38
99219 Hospital observation care, typically 50 minutes	25	25	$148.18	$133.22
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	22	22	$150.53	$129.25
99225 Subsequent observation care, typically 25 minutes per day	13	12	$76.50	$71.48

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	335	159	$111.31	$112.79
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	276	126	$77.98	$77.94
99239 Hospital discharge day management, more than 30 minutes	174	160	$114.28	$116.17
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	111	109	$213.20	$219.59
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	76	69	$147.74	$145.62
99217 Hospital observation care on day of discharge	75	75	$77.47	$78.92
99238 Hospital discharge day management, 30 minutes or less	54	53	$77.77	$77.54
99220 Hospital observation care, typically 70 minutes	44	44	$199.66	$201.60
99219 Hospital observation care, typically 50 minutes	34	34	$142.85	$147.00
99225 Subsequent observation care, typically 25 minutes per day	19	18	$76.46	$79.21
99226 Subsequent observation care, typically 35 minutes per day	14	13	$109.82	$113.75

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	450	206	$129.88	$69.98
99238 Hospital discharge day management, 30 minutes or less	140	130	$143.75	$70.15
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	103	64	$193.89	$101.27
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	59	57	$384.40	$196.73
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	51	49	$245.71	$132.76
99217 Hospital observation care on day of discharge	47	46	$144.47	$70.46
99219 Hospital observation care, typically 50 minutes	45	45	$269.40	$132.01
99231 Follow-up hospital inpatient care per day, typically 15 minutes	29	22	$81.53	$38.24
99225 Subsequent observation care, typically 25 minutes per day	24	19	$128.25	$70.59
99239 Hospital discharge day management, more than 30 minutes	23	23	$128.36	$102.97
99213 Established patient office or other outpatient visit, typically 15 minutes	22	17	$118.00	$49.69
99220 Hospital observation care, typically 70 minutes	11	11	$319.81	$180.13

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License MI 4301050976

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.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

2791817 (MI)

Hospital & Practice Group Affiliations

Apogee Medical Group Michigan Pc

200 N Marshall Ave, Marshall, MI 490681143

Phone: 2697898227

Practice Associates & Co-Workers

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

24 Associated Practitioners

Marlo Kirby , MSN, NP

Nurse Practitioner

NPI 1013021807

Master of Science in Nursing, Nurse Practitioner

Joshua Rich , CRNA

Nurse Anesthetist, Certified Registered

NPI 1063487197

Certified Registered Nurse Anesthetist

Alison Grieme , PA-C

Physician Assistant

NPI 1184875080

Physician Assistant (Certified)

Nicole Thompson , DNAP, CRNA

Nurse Anesthetist, Certified Registered

NPI 1225673387

DNAP, Certified Registered Nurse Anesthetist

Kari Scarbrough , FNP-C

Nurse Practitioner - Family

NPI 1306499108

Family Nurse Practitioner (Certified)

Howard Drews , CRNA

Nurse Anesthetist, Certified Registered

NPI 1336444041

Certified Registered Nurse Anesthetist

Career & Practice History Timeline

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

6 Historical Events

✅

NPI Profile Active December 12, 2014

NPI status registered as active in NPPES database

📍

Updated Practice Location December 12, 2014

Registered at 200 N MADISON ST, MARSHALL, MI 490681143 (Tel: 2697814271)

📍

Updated Business Mailing Address December 12, 2014

Registered at 200 N MADISON ST, MARSHALL, MI 490681143 (Tel: 2697814271)

👤

Provider Name / Credentials Updated December 12, 2014

Recorded as MARY JOHNSON, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) December 12, 2014

Internal Medicine (License #4301050976 in MI)

🟢

Initial NPI Registration & Enumeration October 12, 2006

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: 1053400291

Entity Type:

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

Enumeration Date: October 12, 2006

Last Update: December 12, 2014

Sole Proprietor: No

Update or Correct Profile

Mailing Address

200 N Madison St

Marshall, MI 490681143

Phone: 2697814271

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.