Active NPI 1255371365 Individual Practitioner Male Practitioner

Dr. Keith Marcus , MD

Internal Medicine • Ludington, MI

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Keith Marcus, MD is a certified Internal Medicine practicing in Ludington, MI. With approximately 41 years of clinical experience since graduating from University Of Iowa, Rj & L Carver College Of Medicine in 1985, Dr. Marcus delivers high-quality medical care to the local community at 1 ATKINSON DR.

Dr. Marcus is affiliated with Spectrum Health Primary Care Partners 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, exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1 Atkinson Dr

Ludington, MI 494311906

Telephone 6163913139

Associated Practice Facility / Clinic

🏢 Hospitalist Medicine Physicians Of Michigan - Kalamazoo, Pllc Facility NPI 1669017380

Medicare Profile & Education

Medical School

University Of Iowa, Rj & L Carver College Of Medicine

Graduation Year

1985

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Ludington, MI

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

41 Yrs +16.9 yrs vs City Avg

City Avg: 24.1 Yrs

State Avg: 26.5 Yrs

Regional Practice Density

10 Specialists

Practicing in Ludington, MI (6010 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

73.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Marcus (41 Years) 41 Yrs

Ludington Specialty Average (24.1 Years) 24.1 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	78	47	$261.15	$75.17
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	55	35	$491.18	$112.65
99239 Hospital discharge day management, more than 30 minutes	44	44	$403.50	$108.52
93016 Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician	20	20	$72.00	$19.22
99238 Hospital discharge day management, 30 minutes or less	13	13	$316.08	$76.69
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	13	13	$564.00	$165.21

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	139	71	$718.00	$115.05
99239 Hospital discharge day management, more than 30 minutes	69	63	$737.00	$110.32
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	68	44	$500.00	$76.49
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	35	33	$1389.00	$167.66
99291 Critical care, first 30-74 minutes	30	13	$1534.00	$207.35

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	199	94	$718.93	$98.80
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	127	70	$500.39	$68.67
99239 Hospital discharge day management, more than 30 minutes	90	85	$737.30	$100.77
99291 Critical care, first 30-74 minutes	59	29	$1534.00	$212.30
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	35	33	$1390.44	$191.23
99238 Hospital discharge day management, 30 minutes or less	22	22	$505.50	$69.07
99217 Hospital observation care on day of discharge	14	14	$505.33	$68.89

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	212	101	$741.10	$99.10
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	135	68	$512.49	$70.04
99239 Hospital discharge day management, more than 30 minutes	88	80	$763.71	$102.35
99291 Critical care, first 30-74 minutes	52	30	$1587.72	$216.16
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	34	32	$1439.50	$195.11
99238 Hospital discharge day management, 30 minutes or less	30	30	$515.00	$69.99
99217 Hospital observation care on day of discharge	16	16	$517.52	$69.99
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	11	11	$972.22	$132.58

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	240	109	$741.10	$104.25
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	220	100	$512.49	$72.36
99239 Hospital discharge day management, more than 30 minutes	113	100	$763.71	$106.66
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	91	84	$1439.50	$202.48
99291 Critical care, first 30-74 minutes	44	25	$1587.72	$224.64
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	33	33	$972.22	$137.96
99238 Hospital discharge day management, 30 minutes or less	29	29	$515.00	$72.74
99219 Hospital observation care, typically 50 minutes	17	17	$964.69	$136.44
99217 Hospital observation care on day of discharge	13	13	$517.52	$72.59
99220 Hospital observation care, typically 70 minutes	12	12	$1318.91	$185.85

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	298	129	$428.77	$100.64
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	163	90	$447.99	$71.58
99239 Hospital discharge day management, more than 30 minutes	132	117	$462.79	$105.35
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	101	96	$1072.81	$200.09
99291 Critical care, first 30-74 minutes	46	34	$967.22	$201.85
99217 Hospital observation care on day of discharge	28	28	$386.07	$71.91
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	28	28	$806.53	$135.62
99238 Hospital discharge day management, 30 minutes or less	25	25	$385.48	$71.94
99292 Critical care, each additional 30 minutes	21	15	$529.53	$105.64
99220 Hospital observation care, typically 70 minutes	21	21	$869.00	$183.52
99219 Hospital observation care, typically 50 minutes	11	11	$686.08	$134.41

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	423	174	$131.00	$112.87
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	256	130	$95.00	$78.35
99239 Hospital discharge day management, more than 30 minutes	119	116	$158.00	$115.51
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	111	106	$337.19	$217.53
99238 Hospital discharge day management, 30 minutes or less	84	79	$102.00	$78.71
99291 Critical care, first 30-74 minutes	61	40	$483.43	$241.74
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	36	35	$195.20	$147.50
99217 Hospital observation care on day of discharge	23	23	$105.00	$78.78
93018 Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician	21	21	$68.00	$16.11
93016 Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician	21	21	$68.00	$24.19
99220 Hospital observation care, typically 70 minutes	16	16	$453.67	$196.82
99219 Hospital observation care, typically 50 minutes	12	12	$186.00	$145.18

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	495	211	$131.76	$101.40
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	273	154	$97.93	$69.18
99239 Hospital discharge day management, more than 30 minutes	173	153	$158.53	$103.28
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	131	122	$266.24	$193.25
99238 Hospital discharge day management, 30 minutes or less	104	99	$104.86	$69.65
99291 Critical care, first 30-74 minutes	54	34	$454.24	$218.59
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	44	44	$177.05	$133.51
99217 Hospital observation care on day of discharge	42	42	$105.00	$70.78
93016 Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician	39	38	$68.00	$21.80
93018 Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician	39	38	$68.00	$14.51
99292 Critical care, each additional 30 minutes	32	16	$236.22	$109.74
99219 Hospital observation care, typically 50 minutes	16	16	$186.00	$132.63
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	15	12	$20.00	$8.14
99231 Follow-up hospital inpatient care per day, typically 15 minutes	15	12	$74.00	$38.42

Medical Specialties & State Licenses

CMS Verified: 2024-03-01

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License MI 4301050045

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.

Hospital & Practice Group Affiliations

Spectrum Health Primary Care Partners

4444 Kalamazoo Ave Se, Kentwood, MI 495084600

Phone: 6163915600

Spectrum Health Primary Care Partners

5 Atkinson Dr, Ludington, MI 494311906

Phone: 6162678700

Practice Associates & Co-Workers

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

40 Associated Practitioners

Dr. Maureen Pedres , MD

Internal Medicine

NPI 1003015736

Doctor of Medicine (M.D.)

Amber Bolhuis , PA

Physician Assistant

NPI 1003234410

Physician Assistant

Ora Darling , PA

Physician Assistant

NPI 1003346636

Physician Assistant

Dr. Aline De Quadros Teixeira , MD

Internal Medicine

NPI 1003484213

Doctor of Medicine (M.D.)

Dr. Catherine Czesnowski , MD

Internal Medicine

NPI 1013399245

Doctor of Medicine (M.D.)

Dr. Preyantha Navaratnarajah , DO

Internal Medicine

NPI 1013577105

Doctor of Osteopathic Medicine (D.O.)

Career & Practice History Timeline

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

8 Historical Events

📍

Updated Practice Location March 01, 2024

Registered at 1 ATKINSON DR, LUDINGTON, MI 494311906 (Tel: 6163913139)

📍

Updated Business Mailing Address March 01, 2024

Registered at 100 MICHIGAN ST NE # MC845, GRAND RAPIDS, MI 495032560

✅

NPI Profile Active March 15, 2013

NPI status registered as active in NPPES database

📍

Updated Practice Location March 15, 2013

Registered at 400 HOBART ST, CADILLAC, MI 496012331 (Tel: 2319229270)

📍

Updated Business Mailing Address March 15, 2013

Registered at PO BOX 6545, TRAVERSE CITY, MI 496966545 (Tel: 2319229270)

👤

Provider Name / Credentials Updated March 15, 2013

Recorded as KEITH MARCUS, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) March 15, 2013

Internal Medicine (License #4301050045 in MI)

🟢

Initial NPI Registration & Enumeration June 07, 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: 1255371365

Entity Type:

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

Enumeration Date: June 07, 2006

Last Update: March 01, 2024

Sole Proprietor: No

Update or Correct Profile

Mailing Address

100 Michigan St Ne # Mc845

Grand Rapids, MI 495032560

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

⚠️ Medical Disclaimer

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