Dr. Marisa O'Neill, DO
- Medicare services, 2024
- 89
- Medicare patients, 2026
- 79
- Part D claims, 2026
- 40
- Hospital affiliations
- 5
- Industry payments
- $1,137
- Practice address
- 775 S Main St, Chelsea, MI 48118
- Practice phone
- Call (734) 475-3911
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. O'Neill'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. Marisa O'Neill is a general surgeon in Chelsea, Michigan
Dr. O'Neill practices at Chelsea Hospital in Chelsea, Michigan, part of Trinity Health.
Dr. O'Neill's NPI, 1093164873, was assigned on June 13, 2016. Dr. O'Neill graduated from Michigan State University College of Osteopathic Medicine in 2016. Dr. O'Neill holds Michigan license 5101026448.
- NPI
- 1093164873NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6305130717
- NPI enumeration date
- June 13, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (734) 475-3911
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marisa O'Neill practices at Chelsea Hospital in Chelsea, Michigan
Dr. O'Neill's primary practice is Chelsea Hospital, at 775 S Main St, Chelsea, MI 48118 in Washtenaw County. The practice phone is (734) 475-3911.
- Chelsea Hospital775 S Main St, Chelsea, MI 48118 · Washtenaw CountyPhone(734) 475-3911
Source: Dmand AI Affiliation Data
Dr. Marisa O'Neill is affiliated with 6 sites of care and 3 medical groups
Dr. O'Neill's primary practice is Chelsea Hospital in Chelsea, Michigan, part of Trinity Health. Dr. O'Neill is also affiliated with Corewell Health Beaumont Troy Hospital. The medical group on file is Trinity Health IHA Medical Group. Dmand AI also links Dr. O'Neill to 3 more hospitals, 2 medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Marisa O'Neill's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Neill practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Chelsea Hospital | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Trinity Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Marisa O'Neill is one of 1,095 general surgeons in Michigan
Surgery is Dr. O'Neill's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. O'Neill is licensed in Michigan.
Specialties and state licenses
- Surgery, MichiganPrimary
General surgeons near Dr. O'Neill
Counts of general surgeons 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. Marisa O'Neill billed Medicare for 89 services in 2024
CMS data shows 89 Medicare services from Dr. O'Neill across 4 procedure codes in 2024, for 79 Medicare patients. Medicare paid $14,570 for them.
Dr. O'Neill's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 382024: 5955%
- Other services
- 2023: 02024: 15
- Surgery
- 2023: 02024: 15
Where Dr. O'Neill's Medicare services took place, 2024
- In an office7483%
- In a facility1517%
Dr. O'Neill compared with the Michigan median for general surgeons, 2024
- Dr. O'Neill
- Michigan median
- Medicare services
- 89vs 12629% below
- Medicare patients
- 79vs 10726% below
- Part D claims
- 18vs 3040% below
Medians across 1,046 general surgeons in Michigan with Dmand AI profiles that report each measure.
Dr. O'Neill'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. O'Neill and other general surgeons in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marisa O'Neill treated 79 Medicare patients in 2026, average age 74
CMS counts 79 Medicare patients who saw Dr. O'Neill in 2026. The largest group is 65 to 74, with 43 patients. 75% of them have cancer, and 71% have high blood pressure. Their average risk score is 1.07, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Neill's median patient age at 66, with 99% women.
Dr. O'Neill's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. O'Neill's Medicare patients, 2026
- Cancer75%
- High blood pressure71%
- High cholesterol70%
- Arthritis51%
- Osteoporosis34%
- Mood disorders29%
- Diabetes28%
- Chronic kidney disease27%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Neill's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women99%
- Men1%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Dr. Marisa O'Neill wrote 40 Medicare Part D claims in 2026
In 2026, Dr. O'Neill wrote 40 Medicare Part D claims for 28 patients. 100% of them were for generic drugs. CMS names the drug for 18 of them, across 1 drug with 11 or more claims each, at $119 in total drug cost.
Dr. O'Neill's most prescribed drugs by claims, 2018
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. O'Neill's Part D claims, 2026
- Opioids28%11 of 40 claims
- Antibiotics38%15 of 40 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2026 data
Dr. Marisa O'Neill ranks in the 92nd percentile for mastectomy in Medicare
Dr. O'Neill accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 43 procedures of mastectomy by Dr. O'Neill, more than 92% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. O'Neill ranks in Medicare procedure volume
- Mastectomy
- 92nd percentile43 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 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. Marisa O'Neill received $1,137 in industry payments from 2016 to 2024
CMS Open Payments shows 10 general payments to Dr. O'Neill from 9 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Elucent Medical paid the most, $278.
General payments to Dr. O'Neill by program year, 2016 to 2024
Companies that paid Dr. O'Neill the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marisa O'Neill graduated from Michigan State University College of Osteopathic Medicine
Dr. O'Neill graduated from Michigan State University College of Osteopathic Medicine in 2016.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Marisa O'Neill'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 DataDmand AI Org Hierarchy 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) |
| 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. Marisa O'Neill
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. Marisa O'Neill's NPI number?
Dr. Marisa O'Neill's NPI number is 1093164873. It was assigned on June 13, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Marisa O'Neill?
Dr. Marisa O'Neill is a general surgeon in Chelsea, Michigan. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Marisa O'Neill practice?
Dr. O'Neill practices at 775 S Main St, Chelsea, MI 48118. Dr. O'Neill's primary practice is Chelsea Hospital in Chelsea, Michigan, part of Trinity Health. Dmand AI also links Dr. O'Neill to 3 hospitals, 2 medical groups and 1 group practice or clinic, and a free account names each one.
What is Dr. Marisa O'Neill's office phone number?
The practice phone on file for Dr. O'Neill is (734) 475-3911. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Marisa O'Neill's email address?
Dmand AI checks professional and personal email addresses for Dr. O'Neill through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Marisa O'Neill's medical license number?
Dr. O'Neill holds Michigan license 5101026448.
Which hospitals is Dr. Marisa O'Neill affiliated with?
Dr. O'Neill practices at Chelsea Hospital in Chelsea, Michigan. Dr. O'Neill is also affiliated with Corewell Health Beaumont Troy Hospital. Dmand AI links Dr. O'Neill to 3 more hospitals, named with a free account.
What medical group is Dr. Marisa O'Neill part of?
Dr. O'Neill is linked to Trinity Health IHA Medical Group. Dmand AI links Dr. O'Neill to 2 more medical groups, named with a free account.
Who does Dr. Marisa O'Neill practice with?
Dmand AI links 1,413 HCPs to Dr. O'Neill's primary medical group, 27 of them general surgeons. A free account lists them, with verified contacts.
Does Dr. Marisa O'Neill accept Medicare?
Yes. CMS data shows Dr. O'Neill billed Medicare for 89 services in 2024, and Dr. O'Neill accepts Medicare assignment.
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How many Medicare patients does Dr. Marisa O'Neill see?
CMS counts 79 Medicare patients who saw Dr. O'Neill in 2026, with an average age of 74.
What services does Dr. Marisa O'Neill bill to Medicare?
In 2024, Dr. O'Neill's most billed Medicare services were office visit, established patient (99214), office visit, new patient (99205) and surgery: skin and soft tissue (19301).
Where did Dr. Marisa O'Neill go to medical school?
Dr. O'Neill graduated from Michigan State University College of Osteopathic Medicine in 2016.
What drugs does Dr. Marisa O'Neill prescribe most?
In 2018 Medicare Part D data, Dr. O'Neill's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Marisa O'Neill received payments from drug or device companies?
CMS Open Payments shows $1,137 in general payments to Dr. O'Neill from 9 companies from 2016 to 2024. The largest total came from Elucent Medical.
How long has Dr. Marisa O'Neill been practicing?
Dr. O'Neill graduated from medical school in 2016, 10 years ago.
What EHR does Dr. Marisa O'Neill's practice use?
Dmand AI tracks the EHR system at Chelsea Hospital and at 5 more sites and 2 medical groups. The vendor and product are available with a free Dmand AI account.
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