KEITH MARCUS MD
NPI 1255371365
Internal Medicine in Ludington, MI

NPI Status: Active since June 07, 2006

Contact Information

1 ATKINSON DR
LUDINGTON, MI
ZIP 49431
Phone: (616) 391-3139

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  • Individual
  • Male
  • Years of Experience 41
  • Internal Medicine
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About KEITH MARCUS

This page provides the complete NPI Profile along with additional information for Keith Marcus, an internist established in Ludington, Michigan with a medical specialization in Internal Medicine and more than 41 years of experience. He graduated from University Of Iowa, Rj & L Carver College Of Medicine in 1985. The healthcare provider is registered in the NPI registry with number 1255371365 assigned on June 2006. The practitioner's primary taxonomy code is 207R00000X with license number 4301050045 (MI). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI
1255371365
Provider Name
KEITH MARCUS MD
Gender
Male
Entity Type
Individual
Location Address
1 ATKINSON DR LUDINGTON, MI 49431
Location Phone
(616) 391-3139
Mailing Address
100 MICHIGAN ST NE # MC845 GRAND RAPIDS, MI 49503
Medical School Name
UNIVERSITY OF IOWA, RJ & L CARVER COLLEGE OF MEDICINE
Graduation Year
1985
Is Sole Proprietor?
No
Enumeration Date
06-07-2006
Last Update Date
03-01-2024
Code Navigator

An internist like Keith Marcus is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine

Taxonomy Code
207R00000X
Type
Allopathic & Osteopathic Physicians
License No.
4301050045
License State
MI
Taxonomy Description
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.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • Gold 1 - HMO
  • Gold 1 with Adult Vision Services - HMO
  • Gold 8 - HMO
  • Silver 1 - HMO
  • Silver 1 with Adult Vision Services - HMO
  • Silver 12 with First 4 Primary Care Visits Free - HMO
  • Silver 8 - HMO
  • MyPriority Balanced Silver - HMO
  • MyPriority Premier Silver - HMO
  • MyPriority Standard Bronze - HMO
  • MyPriority Standard Bronze - Travel - HMO
  • MyPriority Standard Gold - HMO
  • MyPriority Standard Silver - HMO
  • MyPriority Standard Silver - Travel - HMO
  • MyPriority Value Bronze - HMO
  • MyPriority Value Bronze HSA - HMO

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Medicare Participation & PECOS Enrollment Status

Keith Marcus is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Keith Marcus is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 345259909

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20070919000668

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Provider Referred Orders for Durable Medical Equipment, Devices & Supplies

The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.

Durable Medical Equipment

  • DME-Oxygen and Supplies (DC002N)

    Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate (HCPCS:E1390)

    3 DME suppliers used 28 Medicare Claims 28 Services Paid

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Critical care, first 30-74 minutes

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

This service was performed 59 times for 29 patients

Follow-up hospital inpatient care per day, typically 25 minutes

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.

This service was performed 127 times for 70 patients

Follow-up hospital inpatient care per day, typically 35 minutes

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.

This service was performed 199 times for 94 patients

Hospital discharge day management, 30 minutes or less

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.

This service was performed 22 times for 22 patients

Hospital discharge day management, more than 30 minutes

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

This service was performed 90 times for 85 patients

Hospital observation care on day of discharge

Hospital observation care on the day of discharge involves monitoring your health status to ensure stability before you leave. This includes assessing vital signs, response to treatment, and readiness for home care or rehabilitation.

This service was performed 14 times for 14 patients

Initial hospital inpatient care per day, typically 70 minutes

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.

This service was performed 35 times for 33 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $31.53 for a new patient copayment and $24.11 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 49431 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $126.15
  • Minimum New Patient Price $54.34
  • Maximum New Patient Price $166.68
  • Average New Patient Copayment $31.53
  • Minimum New Patient Copayment $13.58
  • Maximum New Patient Copayment $41.67

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $96.44
  • Minimum Established Patient Price $17.09
  • Maximum Established Patient Price $135.4
  • Average Established Patient Copayment $24.11
  • Minimum Established Patient Copayment $4.27
  • Maximum Established Patient Copayment $33.85

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Keith Marcus is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
COREWELL HEALTH LUDINGTON HOSPITALONE N ATKINSON DRIVE
LUDINGTON, MI 49431
(231) 843-2591Acute Care Hospitals
MUNSON HEALTHCARE MANISTEE HOSPITAL1465 E PARKDALE AVE
MANISTEE, MI 49660
(231) 398-1000Acute Care Hospitals

Reviews for KEITH MARCUS MD

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NPI Validation Check Digit Calculation


The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.

Start with the original NPI number, the last digit is the check digit and is not used in the calculation.
1255371365
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
22105672312
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 2 + 1 + 0 + 5 + 6 + 7 + 2 + 3 + 1 + 2 + 24 = 55
Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit.
60 - 55 = 55

The NPI number 1255371365 is valid because the calculated check digit 5 using the Luhn validation algorithm matches the last digit of the original NPI number.

Other Providers at the Same Location


The following 20 providers are registered at the same or nearby location.

NPI Name / Type Taxonomy Address
1477085827 KELLY L BUXMAN RD
Individual
Dietitian, Registered1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2369
1760450373 JONATHAN W BILLINGS P.T.
Individual
Physical Therapist (Orthopedic)1 ATKINSON DR
LUDINGTON, MI 49431
(231) 299-0334
1861995573MRS. JENNIFER FRANCES HIGLEY PT
Individual
Physical Therapist1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2132
1073016168 THERESE ZITTA
Individual
Occupational Therapist1 ATKINSON DR
LUDINGTON, MI 49431
(231) 923-3364
1932142221DR. WILLIAM M SHEPPARD MD
Individual
Family Medicine1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2297
1821314378 LUKE J BOOTZ RN
Individual
Nurse Anesthetist, Certified Registered1 ATKINSON DR
LUDINGTON, MI 49431
(231) 480-4668
1669017380HOSPITALIST MEDICINE PHYSICIANS OF MICHIGAN - KALAMAZOO, PLLC
Organization
Internal Medicine1 ATKINSON DR
LUDINGTON, MI 49431
(231) 843-2591
1710517420 BETHANY ANN SOMMERFELDT RD
Individual
Dietitian, Registered1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2369
1639238090 PRITESH V LOHAR MD
Individual
Internal Medicine (Hematology & Oncology)1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-5085
1457964140 KRISTIN N MCKEE MS, RDN
Individual
Dietitian, Registered1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2369
1437733672 BRIANA SOMERO OTRL
Individual
Occupational Therapist1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2458
1427543495 ZACHARY RONALD VANDERLAAN MD
Individual
Emergency Medicine1 ATKINSON DR
LUDINGTON, MI 49431
(231) 843-2591
1245725217 ZACHARY PETER HAMERSMA MD
Individual
Emergency Medicine1 ATKINSON DR
LUDINGTON, MI 49431
(231) 843-2591
1164091476 NANCY A QUINTEROS PT
Individual
Physical Therapist1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2132
1699449207 KIRSEN HUDAK OTR
Individual
Occupational Therapist1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2132
1407545049 MICHELLE RENAE NICEWANDER FNP
Individual
Nurse Practitioner (Family)1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2301
1073275228 MARY ELLEN GILCHRIST FNP-C
Individual
Nurse Practitioner (Family)1 ATKINSON DR
LUDINGTON, MI 49431
(231) 845-2301
1336763275DR. ELEXUS-EMBER ALECZANDRIA VANHAM DO
Individual
Emergency Medicine1 ATKINSON DR
LUDINGTON, MI 49431
(606) 218-5250
1679119317 LAURA MARIE MYERS DNAP, CRNA
Individual
Nurse Anesthetist, Certified Registered1 ATKINSON DR
LUDINGTON, MI 49431
(231) 480-4668
1659149102 HOLLY LYNN BROOKS RN
Individual
Registered Nurse (General Practice)1 ATKINSON DR
LUDINGTON, MI 49431
(123) 151-0308

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1255371365, enumerated in the NPI registry as an "individual" on June 07, 2006

The provider is located at 1 Atkinson Dr Ludington, Mi 49431 and the phone number is (616) 391-3139

The provider's speciality is Internal Medicine with taxonomy code 207R00000X

The provider has more than 41 years of experience. He graduated from University Of Iowa, Rj & L Carver College Of Medicine in 1985.

The provider might be accepting Accepts: Molina Healthcare and Priority Health. Please consult your insurance carrier or call the provider to make sure your health plan is currently accepted.

Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

Medicare beneficiaries should expect a typical cost of $126.15 with an average copayment of $31.53 for new patient appointments. Established patients should expect a typical charge of $96.44 and an average copayment of 24.11. Please review your insurance plan or contact the provider directly to determine your specific costs.

The most common procedures or services performed by this practitioner are: Critical care, first 30-74 minutes, Follow-up hospital inpatient care per day, typically 25 minutes, Follow-up hospital inpatient care per day, typically 35 minutes, Hospital discharge day management, 30 minutes or less, Hospital discharge day management, more than 30 minutes, Hospital observation care on day of discharge and Initial hospital inpatient care per day, typically 70 minutes.

The practitioner is affiliated to the following hospital(s): COREWELL HEALTH LUDINGTON HOSPITAL and MUNSON HEALTHCARE MANISTEE HOSPITAL. Hospital affiliations are identified through self-reporting data and service claims based on the place of service.

This NPI record was last updated on June 07, 2006. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.