Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

MARSDEN SCOTT BLOIS IV MD
NPI 1215938683
Internal Medicine - Advanced Heart Failure and Transplant Cardiology in Boulder, CO

Active since August 09, 2005PECOS Enrolled
4743 ARAPAHOE AVE, STE 201, BOULDER, CO 80303(303) 442-2395(303) 442-1073 Get Directions Write a Review

NPPES record last updated: July 17, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Jul 17, 2026, Feb 6, 2026, Nov 9, 2017 and 2 more (5 updates tracked since 2016).

About Marsden Scott Blois Iv Md NPPES

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

MARSDEN SCOTT BLOIS IV MD (NPI 1215938683) is an individual advanced heart failure and transplant cardiology provider in Boulder, Colorado, licensed in Colorado (DR.0034464) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, maintains a secondary practice location in Longmont, and is a graduate of Baylor College Of Medicine (1993).Information from the official NPPES registry record.

NPPES Registry Identity

NPI1215938683
Entity TypeIndividualMale
Primary Taxonomy207RA0001X
Provider Legal NameMARSDEN SCOTT BLOIS IVCredential: MD
Location Address4743 ARAPAHOE AVE, STE 201Boulder, CO 80303-1113
Mailing Address1760 E Ken Pratt Blvd Ste 205Longmont, CO 80504-5311 · (720) 718-8180 · Fax (720) 718-5989
Fax(303) 442-1073
Sole ProprietorNo
Medical School CMSBaylor College Of MedicineGraduated 1993
Enumeration DateAugust 9, 2005
Last NPPES UpdateJuly 17, 20265 updates tracked since enumeration
NPPES CertifiedJuly 17, 2026
NPI 1215938683 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtyInternal Medicine · Advanced Heart Failure and Transplant CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code207RA0001X
License Licensed in CO · DR.0034464
Definition

Specialists in Advanced Heart Failure and Transplant Cardiology would participate in the inpatient and outpatient management of patients with advanced heart failure across the spectrum from consideration for high-risk cardiac surgery, cardiac transplantation, or mechanical circulatory support, to pre-and post-operative evaluation and management of patients with cardiac transplants and mechanical support devices, and end-of-life care for patients with end-stage heart failure.

Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License DR.0034464 (CO), J7308 (TX)
4743 ARAPAHOE AVE, Boulder, CO 80303

Other Names 1

Other Name (5)Scott Blois Md

Secondary Practice Location 1

Location 11760 E Ken Pratt Blvd Ste 205Longmont, CO 80504-5311 · Phone (720) 718-8180 · Fax (720) 718-5989

Medicare Participation & PECOS Enrollment Status

Marsden Blois 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.

Marsden Blois 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: 4880683077

    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: I20150914002390

    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

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.

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

This service was performed 31 times for 26 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

This service was performed 674 times for 402 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician

An exercise or drug-induced heart stress test with ECG is a procedure to assess how your heart functions under stress. It can involve exercising or medication to make your heart work harder while an ECG records its activity. A physician reviews the results.

This service was performed 49 times for 49 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician

An exercise or drug-induced heart stress test with ECG involves monitoring your heart's activity while it's under stress, either from exercise or medication. A doctor supervises the entire procedure to ensure safety and accuracy in results. This test helps detect heart problems.

This service was performed 49 times for 49 patients

Heart muscle strain imaging

Heart muscle strain imaging is a non-invasive test that uses sound waves to create pictures of your heart. It helps doctors evaluate how well your heart muscle is working and detect any damage or disease. This can aid in diagnosing heart conditions and guiding treatment plans.

This service was performed 16 times for 15 patients

Heart rhythm review and interpretation of continous external ekg over 8-15 days

This service involves wearing a device for 8-15 days that continuously records your heart's electrical activity. It helps in identifying irregular heart rhythms. The recorded data is then reviewed and interpreted by a healthcare professional for any abnormalities.

This service was performed 35 times for 35 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 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 16 times for 16 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

This service was performed 13 times for 13 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

This service was performed 91 times for 91 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

This service was performed 486 times for 422 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 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 56 times for 32 patients

Test for exercise-induced heart and lung stress

This is a test to evaluate how your heart and lungs respond to physical exertion. You'll exercise on a treadmill or a stationary bike, while your heart rate, breathing, blood pressure, and fatigue levels are monitored. This helps identify any abnormal responses to physical activity.

This service was performed 19 times for 19 patients

Transitional care management services for problem of at least moderate complexity

Transitional care management services focus on coordinating and managing your care after you leave the hospital. For moderate complexity problems, this involves managing your medications, arranging further treatments, and ensuring you have the necessary follow-ups.

This service was performed 27 times for 25 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

This service was performed 397 times for 392 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

This service was performed 12 times for 12 patients

Ultrasound of heart with probe in esophagus, with report

This procedure, called a transesophageal echocardiogram, uses a small probe passed into your esophagus to capture detailed images of your heart. The report provides information about your heart's structure and function.

This service was performed 12 times for 12 patients

Ultrasound of heart, follow-up

A follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.

This service was performed 24 times for 24 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $33.13 for a new patient copayment and $25.5 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 80303 ZIP code area.

New Patients Visit Costs *

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

  • Average New Patient Price $132.55
  • Minimum New Patient Price $58.06
  • Maximum New Patient Price $174.82
  • Average New Patient Copayment $33.13
  • Minimum New Patient Copayment $14.51
  • Maximum New Patient Copayment $43.7

Established Patients Visit Costs *

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

  • Average Established Patient Price $102.03
  • Minimum Established Patient Price $18.88
  • Maximum Established Patient Price $142.79
  • Average Established Patient Copayment $25.5
  • Minimum Established Patient Copayment $4.72
  • Maximum Established Patient Copayment $35.69

* 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.

Reviews for MARSDEN SCOTT BLOIS IV MD

There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.

Other Providers at the Same Location


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

Nurse Practitioner (Acute Care)
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303
Physician Assistant (Surgical)
4743 ARAPAHOE AVE, STE 202
BOULDER, CO 80303
Neurological Surgery
4743 ARAPAHOE AVE, STE 202
BOULDER, CO 80303
Psychiatry & Neurology (Neurology)
4743 ARAPAHOE AVE, SUITE 202
BOULDER, CO 80303
Specialist
4743 ARAPAHOE AVE
BOULDER, CO 80303
Specialist
4743 ARAPAHOE AVE, SUITE 104
BOULDER, CO 80303
Urology
4743 ARAPAHOE AVE, SUITE 104
BOULDER, CO 80303
Surgery
4743 ARAPAHOE AVE, SUITE 100
BOULDER, CO 80303
Physician Assistant (Medical)
4743 ARAPAHOE AVE, SUITE 102
BOULDER, CO 80303
Physician Assistant (Surgical)
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303
Physician Assistant
4743 ARAPAHOE AVE, SUITE 100
BOULDER, CO 80303
Surgery
4743 ARAPAHOE AVE, SUITE 100
BOULDER, CO 80303
Physician Assistant (Medical)
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303
Surgery
4743 ARAPAHOE AVE, SUITE 100
BOULDER, CO 80303
Physician Assistant
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303
Surgery
4743 ARAPAHOE AVE, SUITE 100
BOULDER, CO 80303
Nurse Practitioner (Family)
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303
Physician Assistant
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303
Clinic/Center (Ambulatory Surgical)
4743 ARAPAHOE AVE, STE 101
BOULDER, CO 80303
Internal Medicine (Interventional Cardiology)
4743 ARAPAHOE AVE, SUITE 201
BOULDER, CO 80303

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1215938683, enumerated as an "individual" on August 09, 2005.

The provider is located at 4743 ARAPAHOE AVE STE 201 BOULDER, CO 80303 and the phone number is (303) 442-2395.

Internal Medicine with taxonomy code 207RA0001X and a focus in Advanced Heart Failure and Transplant Cardiology.