Dr. Michael A. Marshall, MD
- Medicare services, 2024
- 236
- Medicare patients, 2024
- 131
- Part D claims, 2024
- 7,563
- Publications
- 1
- Hospital affiliations
- 3
- Practice address
- 47601 Grand River Ave, Novi, MI 48374
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St John Hospital and Medical Center - Assarian Cancer Center - HOPD
Acute Care Hospital outpatient department · Novi, Michigan
Find Dr. Marshall's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Michael A. Marshall is an internist in Novi, Michigan
Dr. Marshall practices at St John Hospital and Medical Center - Assarian Cancer Center - HOPD in Novi, Michigan.
Dr. Marshall's NPI, 1487654091, was assigned on July 26, 2005. Dr. Marshall graduated from Wayne State University School of Medicine in 1974. Dr. Marshall holds Michigan license 4301035094.
- NPI
- 1487654091NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113054198
- NPI enumeration date
- July 26, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 78
- Medical school graduation
- 1974
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael A. Marshall practices at St John Hospital and Medical Center - Assarian Cancer Center - HOPD in Novi, Michigan
Dr. Marshall's primary practice is St John Hospital and Medical Center - Assarian Cancer Center - HOPD, at 47601 Grand River Ave, Novi, MI 48374.
- St John Hospital and Medical Center - Assarian Cancer Center - HOPD47601 Grand River Ave, Novi, MI 48374
Source: Dmand AI Affiliation Data
Dr. Michael A. Marshall is affiliated with 7 sites of care and 1 medical group
Dr. Marshall's primary practice is St John Hospital and Medical Center - Assarian Cancer Center - HOPD in Novi, Michigan. Dr. Marshall is also affiliated with Henry Ford Hospital. The medical group on file is Henry Ford Health Providence Hospital. Dmand AI also links Dr. Marshall to 2 more hospitals, 1 clinical lab, 1 group practice or clinic and 1 hospice, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Michael A. Marshall's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marshall practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St John Hospital and Medical Center - Assarian Cancer Center - HOPD | Available with a free account |
| +6 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael A. Marshall is one of 4,804 internists in Michigan
Internal medicine is Dr. Marshall's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Marshall is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. Marshall
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael A. Marshall billed Medicare for 236 services in 2024
CMS data shows 236 Medicare services from Dr. Marshall across 5 procedure codes in 2024, for 131 Medicare patients. Medicare paid $15,871 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Marshall's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1552024: 20331%
- Other services
- 2023: 442024: 3325%
Dr. Marshall compared with the Michigan median for internists, 2024
- Dr. Marshall
- Michigan median
- Medicare services
- 236vs 42344% below
- Medicare patients
- 131vs 15918% below
- Part D claims
- 6,849vs 31421.8 times
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. Marshall's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marshall and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael A. Marshall treated 131 Medicare patients in 2024, average age 73
CMS counts 131 Medicare patients who saw Dr. Marshall in 2024. The largest group is 65 to 74, with 52 patients. 75% of them have high blood pressure, and 69% have high cholesterol. 39% are also on Medicaid. Their average risk score is 2.25, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Marshall's median patient age at 70, with 56% women.
Dr. Marshall's Medicare patients by age, 2024
Dr. Marshall's Medicare patients by sex, 2024
- Women8363%
- Men4837%
Chronic conditions among Dr. Marshall's Medicare patients, 2024
- High blood pressure75%
- High cholesterol69%
- Arthritis52%
- Diabetes47%
- Chronic kidney disease40%
- COPD27%
- Mood disorders26%
- Heart failure25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marshall's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael A. Marshall wrote 7,563 Medicare Part D claims in 2024
In 2024, Dr. Marshall wrote 7,563 Medicare Part D claims for 498 patients. 84% of them were for generic drugs. CMS names the drug for 6,849 of them, across 134 drugs with 11 or more claims each, at $616,979 in total drug cost. In 2023, CMS named 6,745 claims across 128 drugs.
Dr. Marshall's Part D claims by kind of drug, 2024
- Generic6,362 claims84%
- Brand-name1,119 claims15%
- Other82 claims1%
Dr. Marshall's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Marshall's Part D claims, 2024
- Opioids3%243 of 7,563 claims
- Antibiotics1%88 of 7,563 claims
- Antipsychotics, patients 65 and over0%19 of 7,563 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,7452024: 6,8492%
Drugs named by CMS: 134 in 2024, 128 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Michael A. Marshall takes part in Medicare
Dr. Marshall accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal or shaving of skin growth: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Michael A. Marshall has 1 publication on record
Dmand AI links 1 paper to Dr. Marshall in 2022. Dr. Marshall's most frequent co-authors are Brittni McClellan, MD and Susan Steigerwalt, MD.
Dr. Marshall's most frequent co-authors
Recent publications by Dr. Marshall
See who Dr. Marshall researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marshall works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Michael A. Marshall received $2,291 in industry payments from 2016 to 2025
CMS Open Payments shows 46 general payments to Dr. Marshall from 22 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 55% of the total. Eli Lilly and Company paid the most, $1,027.
General payments to Dr. Marshall by program year, 2016 to 2025
General payments to Dr. Marshall by kind, 2016 to 2025
- Food and beverage$1,26455%
- Consulting fees$1,00044%
- Travel and lodging$271%
Companies that paid Dr. Marshall the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael A. Marshall graduated from Wayne State University School of Medicine
Dr. Marshall graduated from Wayne State University School of Medicine in 1974.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael A. Marshall's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael A. Marshall
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael A. Marshall's NPI number?
Dr. Michael A. Marshall's NPI number is 1487654091. It was assigned on July 26, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael A. Marshall?
Dr. Michael A. Marshall is an internist in Novi, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Michael A. Marshall practice?
Dr. Marshall practices at 47601 Grand River Ave, Novi, MI 48374. Dr. Marshall's primary practice is St John Hospital and Medical Center - Assarian Cancer Center - HOPD in Novi, Michigan. Dmand AI also links Dr. Marshall to 2 hospitals, 1 clinical lab, 1 group practice or clinic and 1 hospice.
What is Dr. Michael A. Marshall's medical license number?
Dr. Marshall holds Michigan license 4301035094.
Which hospitals is Dr. Michael A. Marshall affiliated with?
Dr. Marshall is affiliated with Henry Ford Hospital. Dmand AI links Dr. Marshall to 2 more hospitals.
What medical group is Dr. Michael A. Marshall part of?
Dr. Marshall is linked to Henry Ford Health Providence Hospital.
Does Dr. Michael A. Marshall accept Medicare?
Yes. CMS data shows Dr. Marshall billed Medicare for 236 services in 2024, and Dr. Marshall accepts Medicare assignment.
How many Medicare patients does Dr. Michael A. Marshall see?
CMS counts 131 Medicare patients who saw Dr. Marshall in 2024, with an average age of 73.
What services does Dr. Michael A. Marshall bill to Medicare?
In 2024, Dr. Marshall's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and medicare service (G0439).
Where did Dr. Michael A. Marshall go to medical school?
Dr. Marshall graduated from Wayne State University School of Medicine in 1974.
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What drugs does Dr. Michael A. Marshall prescribe most?
In 2024 Medicare Part D data, Dr. Marshall's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Losartan Potassium.
Has Dr. Michael A. Marshall received payments from drug or device companies?
CMS Open Payments shows $2,291 in general payments to Dr. Marshall from 22 companies from 2016 to 2025. The largest total came from Eli Lilly and Company.
How long has Dr. Michael A. Marshall been practicing?
Dr. Marshall graduated from medical school in 1974, 52 years ago.
Does Dr. Michael A. Marshall do research?
Dmand AI links 1 publication to Dr. Marshall.
Who does Dr. Michael A. Marshall publish with?
Dr. Marshall's most frequent co-authors are Brittni McClellan, MD (1 shared paper) and Susan Steigerwalt, MD (1 shared paper).
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